The present invention provides a frequency conversion circuit. The frequency conversion circuit comprises: a differential unit, the differential unit comprising differential pair transistors which are symmetrically arranged, a control end of a differential pair transistor being used for inputting a differential input signal, an input end of the differential unit being connected to a power supply end, and an output end of the differential unit being connected to a current source; a shunt unit, the shunt unit being connected to the current source, an output current of the shunt unit and an output current of the differential unit being jointly controlled by the current source, and the output current of the shunt unit being negatively correlated with an outflow current of the differential unit; and a current acquisition unit, which is used for acquiring a current of the shunt unit and outputting to the input end of the differential unit an acquisition current corresponding to the current of the shunt unit. According to the present invention, by arranging a shunt unit and a current acquisition unit, a feedback mechanism for changes in an amplified signal of the differential unit is established, so that the amplitude is increased while frequency conversion is achieved.
The present invention provides a voltage-controlled oscillation circuit. The voltage-controlled oscillation circuit comprises an LC resonant cavity and a negative resistance network; the negative resistance network comprises a first transistor, a second transistor, a first feedback unit, and a second feedback unit which are symmetrically arranged; the LC resonant cavity comprises multiple stages of resonant units connected in series; the first resonant access end of the LC resonant cavity is connected to the base electrode or the gate electrode of the first transistor; a second resonant access end is connected to the base electrode or the gate electrode of the second transistor; the first feedback unit is arranged between the collector electrode and the base electrode of the first transistor or between the drain electrode and the gate electrode of the first transistor; the second feedback unit is arranged between the collector electrode and the base electrode of the second transistor or between the drain electrode and the gate electrode of the second transistor; the feedback units are each composed of an active transistor. The present invention solves the problem of being difficult in achieving a frequency adjustment range and low-phase noise performance of a voltage-controlled oscillator, and outputs various frequency division signals while obtaining better phase noise performance.
The present invention provides a balun and a mixer. The balun comprises: a first coil and a second coil which are coupled with one another; a midpoint of the first coil forms a first input end of the balun, and a midpoint of the second coil forms a second input end of the balun; the two ends of the first coil respectively form a first output end and a second output end of the balun; the two ends of the second coil respectively form a third output end and a fourth output end of the balun; the third output end and the fourth output end are coupling ends of the first output end and the second output end respectively; the first output end and the fourth output end form a first group of differential output ends, and the second output end and the third output end form a second group of differential output ends. In the actual application process, when selecting the first group of differential output ends or the second group of differential output ends as the output ends, the amplitudes of the outputted differential signals are the same, and the phases are opposite and unrelated to load impedance, and therefore, the amplitude and phase consistency is extremely high.
The present invention provides a low-noise amplifier and an ultra-wideband receiver. The low-noise amplifier at least comprises a first amplification unit. The first amplification unit comprises a first common source amplifier tube, a second common source amplifier tube, a first negative feedback unit, a second negative feedback unit, and an inter-stage matching unit. The inter-stage matching unit comprises a sixth inductor, a first transmission line inductor, and a fourth capacitor. One end of the sixth inductor is connected to a drain of the first common source amplifier tube, and the other end of the sixth inductor is connected to one end of the fourth capacitor so as to form a feedback node. The first transmission line inductor is connected to the feedback node in a floating mode. The other end of the fourth capacitor is connected to a gate of the second common source amplifier tube. The first negative feedback unit is connected across a gate of the first common source amplifier tube and the feedback node. The second negative feedback unit is connected across a drain of the second common source amplifier tube and the feedback node. Therefore, the stability and the gain flatness of the amplifier circuit are improved.
Disclosed is an ultra-wideband adjustable phase shifter loaded with fan-shaped line reflective loads, which is formed by sequentially cascading multiple stages of ultra-wideband adjustable phase shift units loaded with fan-shaped line reflective loads. The ultra-wideband adjustable phase shift units are connected by means of an output node of one ultra-wideband adjustable phase shift unit and an input node of the next stage of ultra-wideband adjustable phase shift unit adjacent to the ultra-wideband adjustable phase shift unit, so as to achieve multi-stage cascade; the ultra-wideband adjustable phase shifter loaded with fan-shaped line reflective loads comprises the input nodes, the output nodes, and quadrature couplers; the input node that receives a signal to be shifted is connected to the input end of the quadrature coupler; the output node that outputs a shifted signal is connected to the isolation end of the quadrature coupler; the straight-through end and the coupling end of the quadrature coupler each are connected to a single-port variable reflective load unit. The phase shifter has a large phase shift range and low additional amplitude change within an ultra-wideband range, and the problem of circuit consistency caused by process fluctuation in production is greatly reduced.
An output matching network for a differential power amplifier. The output matching network comprises M pairs of coupling transmission lines arranged in a mirror symmetry manner, and microstrip transmission lines and matching capacitors which are adapted to the pairs of coupling transmission lines arranged in a mirror symmetry manner, wherein M ≥ 1, and each pair of coupling transmission lines arranged in a mirror symmetry manner comprises a left coupling transmission line and a right coupling transmission line. According to the output matching network, a low-loss and miniaturized output impedance matching network is realized by using microstrip coupling transmission lines. When the network is applied to a differential power amplifier, an internal energy transfer mode of an electromagnetic coupling mode of the network can provide a good electrostatic protection function for an output end of a differential power transistor in the differential power amplifier, so as to enhance the anti-interference performance of the device; and the internal loss of the network can also be reduced, thereby improving the working efficiency of the amplifier.
Disclosed is an ultra-wideband microwave and millimeter wave differential power amplifier, comprising an input end, an output end, an input matching network connected to the input end, an output matching network connected to the output end, and an N-way power amplifier circuits connected in parallel between the input matching network and the output matching network, wherein N is the number of ways of the power amplifier circuit in the power amplifier; N≥1; each way of power amplifier circuit comprises Q differential power transistors; Q is the number of stages of the power amplifier circuit; Q≥1; two adjacent differential power transistors located on the same way are connected to each other by means of an inter-stage matching network; the differential power transistors comprise at least a pair of power transistors and gain enhancement networks in a differential working mode. This implementation enhances the anti-interference performance of the amplifier, achieves impedance matching of a large signal in an ultra-wide frequency band, greatly improves the working bandwidth of the large signal of the amplifier, and has high efficiency.
Disclosed by the present utility model is an ultra-wideband adjustable phase shifting unit that is loaded with a fan-shaped wire reflection load. The ultra-wideband adjustable phase shifting unit comprises: an input node, an output node and a quadrature coupler. The input node that receives a signal to be phase-shifted is connected to the input end of the quadrature coupler, the output node that outputs a phase-shifted signal is connected to the isolated end of the quadrature coupler, and the through end and coupled end of the quadrature coupler are each connected to a single-port variable reflective load unit. The present utility model uses the reflective phase-shift circuit architecture of the quadrature coupler, can achieve good input and output standing wave characteristics in an octave band range, and further combines a relatively large phase-shift range and relatively low additional amplitude variations within an ultra-wideband range, thus greatly reducing the circuit consistency problem caused by process fluctuations during production.
Disclosed in the present application is a compact amplifier power supply port electrostatic protection circuit, comprising a power port, a radio frequency port, and an electrostatic protection circuit located between the power port and the radio frequency port. The power port is connected to the radio frequency port by means of a power line; the electrostatic protection circuit comprises a negative-voltage electrostatic protection circuit, a positive-voltage electrostatic protection circuit, and a positive-voltage buffer circuit; one end of the negative-voltage electrostatic protection circuit is connected to the power port by means of the power line, and the other end is grounded; one end of the positive-voltage buffer circuit is connected to the power port by means of the power line, and the other end is connected to one end of the positive-voltage electrostatic protection circuit; and the other end of the positive-voltage electrostatic protection circuit is grounded. The present application can cover a common power supply voltage range of a radio frequency amplifier, is good in universality, compact in structure, and small in size, and greatly reduces the area of a chip.
NNiiNN. The present invention employs the phase shifting units, utilizes the advantage of a lumped parameter circuit having a small footprint, and allows the phase shifter to be structurally compact, small in terms of area, inexpensive, and easily integrated. The lumped phase shifting units in the present invention can be selected as required to be entirely high-pass lumped phase shifting units or entirely low-pass phase shifting units, the circuit structure is flexible, and requirements of various working frequencies can be satisfied. The lumped phase shifting units in the present invention can also be selected as required to be in the form of high-pass lumped phase shifting units and low-pass phase shifting units being connected in series, thus implementing a further widened bandwidth.
A nonlinear feedback circuit comprises one or more diodes (D1-Dn). Also provided is a low noise amplifier using the nonlinear feedback circuit. The present invention employs a negative temperature characteristic of a diode (D1-Dn) to perform temperature compensation for a gain change of a low noise amplifier, thereby achieving gain stability. Moreover, a nonlinear characteristic of the diode (D1-Dn) is employed to provide higher harmonics for the low noise amplifier. Countervailing and additive effects between the higher harmonics allow the low noise amplifier to have a higher OIP3.
H03F 3/21 - Amplificateurs de puissance, p. ex. amplificateurs de classe B, amplificateur de classe C comportant uniquement des dispositifs à semi-conducteurs
12.
INTERMEDIATE FREQUENCY AMPLIFIER BASED ON GAAS PHEMT PROCESS
Disclosed is an intermediate frequency amplifier based on a GaAs pHEMT process, the amplifier comprising: an input matching unit, a cascode amplification unit, an output matching unit and a feedback unit, wherein the input matching unit, the cascode amplification unit and the output matching unit are connected to each other in sequence, the feedback unit is arranged between the input matching unit and the output matching unit, and the possibility of resonance far beyond a working band is prevented in a lumped manner. The intermediate frequency amplifier in the present invention can realize a high gain of more than 24 dB in a frequency band of 30 MHz to 200 MHz; absolute stability is achieved across the whole microwave radio frequency band, without adding an extra off-chip stabilizing circuit, such that the layout is simplified; a noise coefficient of less than 1.5 dB is realized in a frequency band of 30 MHz to 200 MHz; and the size is only 1000μm*800μm, such that it is very convenient to integrate same into a system or cascade the same unit.
NNN stage detection units. By means of adding a low noise amplifier in front of a first stage limiting amplifier, the present invention increases the detection sensitivity of the entire detector and, by means of the combination of the low noise amplifier and the compensation detection unit, expands the dynamic range of the detection of the entire detector.
A passive wideband frequency mixer, comprising: a local oscillation balun, a radio frequency balun, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, an inductive compensation unit, and a grounded lossy inductance network. The described frequency mixer may achieve a mixer having a bandwidth ratio of less than 1:7, and points having deteriorated isolation are effectively inhibited without affecting full band frequency conversion loss; moreover, a local oscillator radio frequency port isolation metric is optimized within the full band, which may meet the needs for the application of a wideband frequency mixer in a communication system.
Disclosed is a broadband compact radio-frequency power distributor, comprising an input port, a first output port, and a second output port. The input port is connected to the first output port by means of a first path of transmission line; the input port is connected to the second output port by means of a second path of transmission line; each of the first transmission line and the second transmission line comprises a gain compensation network and a transmission line fitting network, and the structures of the first transmission line and the second transmission line are completely identical; the first output port is connected to the second output port by means of an isolation network. According to the present invention, the functions of the power distributor and an equalizer are integrated by means of the gain compensation networks in the two paths of transmission lines, thereby greatly reducing the area of the whole power distributor and reducing production costs; moreover, the gain compensation networks have large loss at low frequency, thereby being capable of improving the matching of the input port.
Disclosed is a low-pass matching-type numerical control attenuator circuit with a large dynamic constant phase. The circuit comprises: an input node and an output node, wherein a reference path and an attenuation path are connected between the input node and the output node; and the input node receives a signal to be attenuated, and the output node outputs an attenuated signal. The beneficial effects of the present invention are: (1) using a circuit architecture which is switched between a reference path and an attenuation path can achieve a constant phase characteristic while a high dynamic attenuation range is satisfied; (2) an asymmetrical switch structure being connected to a reactive element in series to constitute a low-pass matching structure can achieve large dynamic, high precision, low insertion loss and low additional phase shift characteristics in a relatively wide frequency range; and (3) using an improved T-type or π-type resistor network can further improve attenuation accuracy.
Provided is an ultra-wideband low-noise amplifier, comprising a first bipolar transistor Q1, a second bipolar transistor Q2, a third bipolar transistor Q3, and a fourth bipolar transistor Q4. A second inductor L2 and a second resistor R2 constitute a degenerative feedback loop, performing ultra-wideband power matching and noise matching on the first bipolar transistor Q1; thus it is possible to achieve 50 ohm input impedance matching and output impedance matching within an ultra-wide frequency range of 0.5 GHz to 20 GHz, and also achieve a noise coefficient of less than 4 dB within an ultra-wide frequency range of 0.5 GHz to 20 GHz. The configuration of the circuit is simple, and the overall area of the circuit is small.
Disclosed is an ultra-low-noise amplifier, comprising a first-level amplification unit, a second-level amplification unit and a third-level amplification unit, which are in cascade connection, wherein an input end of the first-level amplification unit is connected to an input matching network, and an output end of the third-level amplification unit is connected to an output matching network; an inter-level matching network is connected between two adjacent levels of amplification units; and the three levels of amplification units all use a PHEMT as an amplifier. The ultra-low-noise amplifier is characterized in that there are two PHEMTs in the third-level amplification unit, and directional couplers are only provided at an input end and the output end of the third-level amplification unit. The present utility model can solve the problems commonly present in traditional low-noise amplifiers of a noise coefficient being too high and linearity being too low.
The present invention discloses an ultra wide band fixed phase shifter based on a capacitive load, which includes N physically separated phase shift units, and each phase shift unit includes an orthocoupler, first and second transmission lines, and first and second capacitive loads, wherein the orthocoupler includes an input end, a coupling end, a direct-connection end and an isolation end, one end of the first transmission line serves as a signal input end of the phase shift unit and the other end is connected with the input end of the orthocoupler, one end of the second transmission line serves as a signal output end of the phase shift unit and the other end is connected with the isolation end of the orthocoupler; one end of the first capacitive load is connected with the coupling end of the orthocoupler and the other end is grounded; one end of the second capacitive load is connected with the direct-connection end of the orthocoupler and the other end is grounded. The ultra wide band fixed phase shifter based on a capacitive load has compact structure, small area occupation and small insertion loss, does not need extra power supply and logical control, and can be widely applied.
H03H 7/19 - Déphaseurs à deux accès produisant un déphasage prédéterminé, p. ex. filtres "passe-tout"
H01P 5/18 - Dispositifs à accès conjugués, c.-à-d. dispositifs présentant au moins un accès découplé d'un autre accès consistant en deux guides couplés, p. ex. coupleurs directionnels
The present invention discloses an ultra wide band digital phase shifter, wherein the phase shifter includes a coupler, a first impedance network and a second impedance network. The coupler is cascaded by spiral inductor coupling units; each stage of spiral inductive coupling unit includes a first spiral inductor and a second spiral inductor coupled mutually; multistage cascade of the spiral inductor coupling units is implemented through the series connection of each stage of first spiral inductors and the series connection of each stage of second spiral inductors; and the coupling interval or microstrip band width of each stage of spiral inductor coupling unit in the coupler from the exterior to the interior decreases gradually. The impedance networks are implemented using LC circuits and switching elements, and the states of the impedance networks are switched by a switch, thus producing phase displacement; therefore, the impedance network is rational in structure and is easy to implement; the phase shifter has the advantages of compact structure, small area occupation and good wideband character and has larger advantages and application space in integrated chip applications.
H03H 7/19 - Déphaseurs à deux accès produisant un déphasage prédéterminé, p. ex. filtres "passe-tout"
H01Q 3/38 - Dispositifs pour changer ou faire varier l'orientation ou la forme du diagramme de directivité des ondes rayonnées par une antenne ou un système d'antenne faisant varier la phase relative ou l’amplitude relative et l’énergie d’excitation entre plusieurs éléments rayonnants actifsDispositifs pour changer ou faire varier l'orientation ou la forme du diagramme de directivité des ondes rayonnées par une antenne ou un système d'antenne faisant varier la distribution de l’énergie à travers une ouverture rayonnante faisant varier la phase par des moyens électriques avec des déphaseurs variables les déphaseurs étant numériques
H03H 7/09 - Filtres comportant une inductance mutuelle
Disclosed in the present invention is a capacitive load-based ultra wide band constant value phase shifter, comprising N physically separated phase shift units, each phase shift unit comprising an orthogonal coupler, a first and a second transmission line, and a first and a second capacitive load, the orthogonal coupler comprising an input end, a coupling end, a direct communication end, and an isolation end, the first end of the first transmission line acting as a signal input end for the phase shift unit, and the other end being connected to the input end of the orthogonal coupler, a first end of the second transmission line acting as a signal output end for the phase shift unit, the other end being connected to the isolation end of the orthogonal coupler; one end of the first capacitive load is connected to the coupling end of the orthogonal coupler, and the other end is grounded; and one end of the second capacitive load is connected to the direct communication end of the orthogonal coupler, and the other end is grounded. The invention is structurally compact, occupies a small area, has low insertion loss, does not require extra power and logic control, and can be widely applied.
Disclosed is an ultra-wideband digital phase shifter. The phase shifter comprises a coupler, and a first and second impedance network; the coupler is formed by cascading spiral inductive coupling units; each stage of spiral inductive coupling unit comprises a first spiral inductor (L11) and a second spiral inductor (L12) which are coupled to each other; the various spiral inductive coupling units are cascaded by connecting a first spiral inductor (L11) in each stage in series and connecting a second spiral inductor (L12) in each stage in series; a coupling distance or a microstrip line width of the various spiral inductive coupling units in the coupler is decreased progressively from the outside to the inside; the impedance network is realised by adopting an LC circuit and a switch element; and a switch is used to switch a state of the impedance network, so as to generate a phase shift. The present invention has a rational structure and is easy to realize; and the present phase shifter occupies a small area, has a good broadband property, and has a relatively great advantage and application space in an integrated chip application.
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