Abstract

A system has a baseband gain stage to receive incoming in-phase and quadrature voltage signals and output in-phase and quadrature current signals, a mixer core arranged to receive the in-phase and quadrature current signals and output radio frequency signals, and a variable gain amplifier to receive the radio frequency signals and produce a broadband radio signal.

IPC Classes  ?

• H04B 1/04 - Circuits
• H03G 3/30 - Automatic control in amplifiers having semiconductor devices
• H03F 3/19 - High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
• H03F 3/45 - Differential amplifiers
• H03G 1/00 - Details of arrangements for controlling amplification
• H03C 1/62 - Modulators in which amplitude of carrier component in output is dependent upon strength of modulating signal, e.g. no carrier output when no modulating signal is present

Abstract

ds can be measured through Kelvin sensing drain and source pins of the power MOSFET, which are connected to a current sense circuit.

IPC Classes  ?

• G06F 17/50 - Computer-aided design

Abstract

A method and apparatus for automatic resonance detection is disclosed for a motor- driven mechanical system such as a voice coil motor (VCM) in which a resonance detector and driver are provided. The automatic resonance detector may be implemented on the same integrated circuit as the driver, and dynamically determines the natural resonant frequency of the VCM driven by the driver. The resonant frequency is determined by measuring the back electromotive force (BEMF) of the VCM, detecting the slope of the BEMF signal, and determining the resonant frequency from the slope of the BEMF signal.

IPC Classes  ?

• H02P 25/02 - Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor

Abstract

A locking/unlocking mechanism for a contactless gesture detection system of a device is described herein. The locking/unlocking mechanism can facilitate automatic locking, manual locking, and/or manual unlocking of the contactless gesture detection system. The contactless gesture detection system can implement the locking/unlocking mechanisms described herein to control a contactless gesture-based user interface state of the device. In various implementations, the controlling can include detecting gestures associated with a user in a contactless space associated with the device; detecting a defined gesture sequence over a defined time period from the detected gestures; and transitioning the device to a contactless gesture-based user interface locked state or a contactless gesture-based user interface unlocked state based on the defined gesture sequence.

IPC Classes  ?

• G06F 3/01 - Input arrangements or combined input and output arrangements for interaction between user and computer
• G06F 3/0346 - Pointing devices displaced or positioned by the userAccessories therefor with detection of the device orientation or free movement in a 3D space, e.g. 3D mice, 6-DOF [six degrees of freedom] pointers using gyroscopes, accelerometers or tilt-sensors

Abstract

A digital input to a digital-to-analog converter (DAC) is divided into a most significant portion and a lesser significant portion. At least one tap voltage generator generates a plurality of voltages, preferably using a resistor string. A decoder decodes at least one subword that forms the lesser significant portion to generate a corresponding at least one control signal. A switching unit accesses voltages generated by the at least one tap voltage generator in response to the at least one control signal. A scaled current generator generates a respective weighted current from each accessed voltage. An output stage combines all the weighted currents with a voltage that is an analog representation of the most significant portion of the digital input to generate an analog approximation of the entire digital input.

IPC Classes  ?

• H03M 1/66 - Digital/analogue converters

Abstract

An integrator system may have a pair of sampling circuits each having a sampling capacitor to sample a respective component of a differential input signal, and an integrator having inputs coupled to outputs of the sampling circuits. The system may have a shorting switch coupled between input terminals of the sampling capacitors. The shorting switch may be engaged during an interstitial phase between sampling and output phases of the sampling circuits. By shorting input terminals of the sampling capacitors together, the design reduces current drawn by the system and, in some designs, severs relationships between current draw and information content sampled by the system. Configurations are disclosed for analog and digital input signals

IPC Classes  ?

• H03M 1/00 - Analogue/digital conversionDigital/analogue conversion
• H03M 3/00 - Conversion of analogue values to or from differential modulation
• G06G 7/186 - Arrangements for performing computing operations, e.g. amplifiers specially adapted therefor for integration or differentiation using capacitive elements using an operational amplifier comprising a capacitor or a resistor in the feedback loop

Abstract

A method for tracing edges of an image using hysteresis thresholding includes: (i) receiving an edge map of the image, (ii) scanning one row of the input edge map, (iii) assigning a label to each edge pixel in the row based at least in part on the presence or absence of a neighboring edge pixel, (iv) grouping contiguous labels, and (v) identifying groups of edge pixels.

IPC Classes  ?

• G06K 9/48 - Extraction of features or characteristics of the image by coding the contour of the pattern
• G06T 7/00 - Image analysis