Abstract: A semiconductor device comprises first mixer circuitry and processing circuitry. The first mixer circuitry is configured to generate a plurality of first mixer outputs through quadrature decomposition of a sensing signal. The first sensing signal corresponds to a capacitance of a first sensing electrode supplied with a drive signal. The quadrature decomposition is based on an in-phase local carrier which is in phase with the drive signal and an out-of-phase local carrier having a phase different from that of the in-phase local carrier. The plurality of first mixer outputs comprises an in-phase mixer output generated based on the in-phase local carrier and the sensing signal, and an out-of-phase mixer output generated based on the out-of-phase local carrier and the sensing signal.

Abstract: A method includes driving, by the master controller, transmitter electrodes with a first transmitter signal having a first sensing frequency while transmitting a first trigger signal to slave controllers, obtaining a location of an input object determined from first capacitive measurements determined by the slave controllers using the first trigger signal, and performing a resonant frequency scan. The performing the resonant frequency scan is by performing for each possible resonant frequency of resonant frequencies: driving, by the master controller, only a subset of the transmitter electrodes with a second transmitter signal having the possible resonant frequency while transmitting a second trigger signal to the slave controllers, wherein the subset corresponds to the location of the input object. The slave controllers demodulate a resulting signal according to the second trigger signal to obtain a second capacitive measurements for the possible resonant frequency.

Abstract: Systems and methods for low latency adaptive noise cancellation include an audio sensor to sense environmental noise and generate a noise signal, an audio processing path to receive an audio signal, process the audio signal through an interpolation filter, and generate a primary audio signal having a first sample frequency, an adaptive noise cancellation processor to receive the noise signal and generate an anti-noise signal, a direct interpolator to receive the anti-noise signal and generate an anti-noise signal having the first sample frequency, and a limiter to provide clipping to reduce a number of bits in the anti-noise signal, an adder operable to combine the primary audio signal and the anti-noise signal and generate a combined output signal, and a low latency filter to process the combined output signal.

Abstract: An input device includes a plurality of sensor electrodes, an antenna, and a shield trace disposed between at least some of the sensor electrodes and the antenna. The antenna may be coupled to a transceiver and may transmit and receive radio-frequency (RF) communication signals. The shield trace may reduce, at least in part, coupling of the RF communication signals from the antenna to the sensor electrodes. The plurality of sensor electrodes may determine a presence, and/or a motion associated with an input object.

Abstract: A force pad sensor includes a face sheet including a force sensing resister, and a printed circuit board assembly. The printed circuit board assembly includes a proximity sensor layer including a proximity receiver electrode and a proximity transmitter electrode, and a force sensor layer including a force receiver electrode and a force transmitter electrode. The force receiver electrode and the FSR intersect a same vertical plane, the vertical plane being perpendicular to the face sheet.

Abstract: Baseline update for input object detection includes determining raw measurements from resulting signals acquired for a sensing region, obtaining a masked region of the sensing region based on the raw measurements, and generating a baseline update value using a subset of the raw measurements corresponding to an unmasked region. A baseline value of the masked region is updated using the baseline update value to obtain an updated baseline. A location of an input object is detected using the updated baseline.

Abstract: A display driver comprises: subpixel rendering (SPR) circuitry configured to use, in SPR, predetermined regions which fall within two lines of input subpixels of an input image; buffer memory circuitry configured to store first subpixel data for a plurality of first subpixels of the input subpixels, wherein the plurality of the first subpixels each are encompassed in the predetermined regions; and a register configured to store coefficients, wherein the coefficients respectively correspond to shapes of the portions of the first subpixels encompassed in the predetermined regions. The SPR circuitry is configured to calculate second subpixel data for second subpixels of an output image, based on the first subpixel data stored in the buffer memory circuitry and the coefficients stored in the register.

Abstract: A display driver is disclosed. The display driver includes: a memory that stores initial control points (CPs) defining a first gamma curve for a first analog state associated with a display panel (DP); CP calculation circuitry that generates, based on the initial CPs, calculated CPs for a second analog state associated with the DP; multiplexer circuitry that: inputs the calculated CPs, auxiliary CPs defining a second gamma curve, and a switching signal identifying a luminance of a region of an image; and outputs, based on the switching signal, selected CPs; and gamma curve calculation circuitry that: inputs a data value associated with the region of the image; generates, based on the selected CPs, a portion of an output gamma curve near the data value; and outputs a voltage data for displaying the region of the image on the DP based on the data value and the output gamma curve.

Abstract: Low power input object settlement detection systems and methods for operating a capacitive sensor having a plurality, M, of transmitter electrodes and a plurality, N, of receiver electrodes, wherein N and M are integer values. A plurality of input object settlement scans are captured, when a presence of an input object is detected, or in response to a presence of an input object being detected, wherein capturing each input object settlement scan includes driving all or a portion of the plurality, M, of transmitter electrodes simultaneously and detecting receiver signals from at least a subset of the plurality, N, of receiver electrodes simultaneously. When a difference between subsequent input object settlement scans is below a threshold value, a full input object image is acquired.

Abstract: An input device including a sensing region is disclosed. The input device includes: sensor circuitry configured to: operate, during a first timeslot, electrodes as a first cluster; and operate, during a second timeslot, the electrodes as a second cluster, where the electrodes are aligned with an axis, and where at least one of the electrodes operates as a transmitter in the first cluster and as a receiver in the second cluster; and determination circuitry configured to: determine a first set of signal values associated with a first set of electrodes in the first cluster; determine a second set of signal values associated with a second set of electrodes in the second cluster; and generate a profile for the sensing region based on the first set of signal values and the second set of signal values, where the profile reflects an input object in the sensing region.

Abstract: A system and method for reducing electromagnetic interference of a display device. The display device may have a plurality of gate electrodes and a plurality of common electrodes. Further, the display device includes a processing system that is configured to drive a first gate electrode of a plurality of gate electrodes of the display device with a first gate select signal to select first subpixels for updating during a first period. The processing system further comprises driving a first common electrode proximate the first gate electrode with a reference signal during the first period. Further, the processing system is configured to drive a second common electrode with a first interference reduction signal during the first period to reduce the electromagnetic interference of the display device.

Abstract: A system and method for updating a display device comprises a first charge pump configured to drive a first gate line of the display device with a first voltage during a first period, a second charge pump configured to transition the first gate line from the first voltage to a second voltage during a second period, a third charge pump configured to drive the first gate line with the second voltage during a third period, and a fourth charge pump configured to transition the first gate line from the second voltage to the first voltage during a fourth period, wherein the first period occurs before the second period, the second period occurs before the third period, and the third period occurs before the fourth period.

Abstract: A method for detecting presence of a person includes emitting, by a speaker of a device, a plurality of ultrasonic ping signals, receiving, by a microphone of the device, a plurality of reflected ultrasonic ping signals, and processing the received reflected signals to determine a presence of a person within a predetermined distance of the device. The processing includes determining changes in the reflected signals relative to the emitted signals by generating an impulse response by cross-correlating the received signals and the emitted signals, averaging the cross-correlated impulse response over a set time period, and generating a detection signal by subtracting the averaged cross-correlated impulse response from an instantaneous impulse response, applying a time gating function to select a portion of the detection signal corresponding to the reflected signal from the predetermined distance from the device, and applying gain compensation to the time gated detection signal to compensate signal falloff.

Abstract: Systems and methods for low power lattice wave filters include an input operable to receive a digital input signal having a first sample rate, a first processing branch including a first delay element operable to receive the digital input signal and output a delayed digital input signal, a second processing branch including a first adder operable to receive the digital input signal and subtract a delayed feedback signal to produce a difference signal, a second adder operable to combine the delayed digital input signal and the difference signal to produce an output signal, and wherein the second processing branch further includes a feedback path including a second delay element operable to receive the output signal and output the delayed feedback signal. In a multistage topology, a register is disposed between each stage and clocked to reduce ripple power.

Abstract: The invention relates to a processing system. The processing system includes a sensor module performing a first measurement to obtain a combination signal using a first sensor electrode and a second sensor electrode. The first electrode is driven using a first modulated signal with a first driving voltage amplitude and simultaneously the second electrode is driven using a second modulated signal with a second driving voltage amplitude greater than the first driving voltage amplitude, while simultaneously first and second resulting signals are received from the first and second electrodes, respectively. The sensor module is further performs a second measurement to obtain a transcapacitance signal using the first and second sensor electrodes.

Abstract: Systems and methods according to one or more embodiments provide a low power current steering digital-to-analog converter. In one example, a device includes a current cell including a plurality of switches. The device further includes a current cell controller configured to selectively operate the plurality of switches. The plurality of switches is selectively operated to cause the current cell to generate a current signal in response to a first data signal. The plurality of switches is selectively operated to disable the current cell in an absence of the first data signal. The plurality of switches is selectively operated to transition the current cell to a common mode state before the current cell receives the first data signal. Related systems and methods are also provided.

Abstract: An input device comprises a plurality of sensor electrodes and a processing system coupled to the plurality of sensor electrodes. The processing system comprises a sensor driver. The sensor driver comprises clock synchronization circuitry, a blocking pulse generator, and a sensor module. The clock synchronization circuitry is configured to receive an external clock signal, and synchronize an internal clock signal with the external clock signal. The blocking pulse generator is configured to generate a first blocking pulse based on the internal clock signal. The sensor module comprises sensing circuitry and is configured to pause acquisition of a resulting signal from a sensor electrode based on the first blocking pulse.

Abstract: A force sensing apparatus includes a first layer having a first electrode disposed thereon, a second layer having a second electrode disposed thereon, and a spacer layer configured to transfer an input force exerted on the first layer to the second layer. The spacer layer causes a change in a separation distance between the first electrode and the second electrode in response to the input force. The force sensing apparatus further includes processing circuitry to detect a change in capacitive coupling between the first electrode and the second electrode based on the change in separation distance, and to determine force information about the input force based at least in part on the detected change in capacitive coupling.

Abstract: An input device includes a first electrode layer including electrodes, a second electrode layer including electrodes, an insulating layer disposed between the first and the second electrode layers, and capacitive sensing elements organized in rows and columns. Each of the capacitive sensing elements is formed by one of the electrodes in the first electrode layer and one of the electrodes in the second electrode layer. A set of the capacitive sensing elements organized in adjacent rows shares a common first electrode in the first electrode layer. Each of the capacitive sensing elements in the set of capacitive sensing elements is associated with a distinct electrode of the electrodes in the second electrode layer.

Abstract: An input device includes a plurality of sensor electrodes and a processing system that is operable in at least a first mode or a second mode. The processing system is configured to receive an input current from a pair of the sensor electrodes. When operating the first mode, the processing system is configured to measure a capacitance across the pair of sensor electrodes based on the received input current. When operating the second mode, the processing system is configured to measure a resistance between the pair of sensor electrodes based on the received input current.