Patents Assigned to Cirrus Logic International Semiconductor Ltd.
  • Publication number: 20220307867
    Abstract: A system may include a resistive-inductive-capacitive sensor configured to sense a physical quantity, and a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to measure one or more resonance parameters associated with the resistive-inductive-capacitive sensor and indicative of the physical quantity and, in order to maximize dynamic range in determining the physical quantity from the one or more resonance parameters, dynamically modify, across the dynamic range, either of reliance on the one or more resonance parameters in determining the physical quantity or one or more resonance properties of the resistive-inductive-capacitive sensor.
    Type: Application
    Filed: March 29, 2021
    Publication date: September 29, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Tejasvi DAS, Siddharth MARU, John L. MELANSON
  • Publication number: 20220307872
    Abstract: A system may include a plurality of sensors configured to sense a physical quantity and a calibration subsystem configured to perform a calibration comprising: comparing a measured characteristic from each of at least two sensors of the plurality of sensors to determine a sensitivity drift of at least one sensor of the plurality of sensors; based on the measured characteristics of the at least two sensors and stored reference characteristics for the at least two sensors, calculating a normalization factor; and applying the normalization factor to the measured characteristic of the at least one sensor to ensure sensitivity of the plurality of sensors relative to each other remains approximately constant.
    Type: Application
    Filed: March 24, 2021
    Publication date: September 29, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Siddharth MARU, Josh SANZ-ROBINSON, Tejasvi DAS, John L. MELANSON
  • Publication number: 20220308000
    Abstract: A system may include a resonant sensor configured to sense a physical quantity, a measurement circuit communicatively coupled to the resonant sensor and configured to measure one or more resonance parameters associated with the resonant sensor and indicative of the physical quantity using an incident/quadrature detector having an incident channel and a quadrature channel and perform a calibration of a non-ideality between the incident channel and the quadrature channel of the system, the calibration comprising determining the non-ideality by controlling the sensor signal, an oscillation signal for the incident channel, and an oscillation signal for the quadrature channel; and correcting for the non-ideality.
    Type: Application
    Filed: March 29, 2021
    Publication date: September 29, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Tejasvi DAS, Siddharth MARU, John L. MELANSON
  • Publication number: 20220310057
    Abstract: A method of modelling speech of a user of a headset comprising a microphone, the method comprising: receiving a first sample, from a bone-conduction sensor, representing bone-conducted speech of the user; obtaining a measure of fundamental frequency of the bone-conducted speech in each of a plurality of speech frames of the first sample; obtaining a first distribution of the fundamental frequencies of the bone-conducted speech over the plurality of speech frames; receiving, from the microphone, a second sample; determining a first acoustic condition at the headset based on the second signal; performing a biometric process based on the first distribution of fundamental frequencies and the first acoustic condition.
    Type: Application
    Filed: June 14, 2022
    Publication date: September 29, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventor: John P. LESSO
  • Publication number: 20220303673
    Abstract: A method of obtaining a directional microphone signal, the method comprising: receiving first and second microphone signals from first and second microphones separated by a distance; obtaining a combined microphone signal based on one or more of the first and second microphone signals; obtaining a difference microphone signal by subtracting the second microphone signal from the first microphone signal; obtaining a transformed combined microphone signal by applying a Hilbert transform to the combined microphone signal; combining the transformed combined microphone signal with the difference microphone signal to obtain the directional microphone signal.
    Type: Application
    Filed: March 18, 2021
    Publication date: September 22, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Dayong ZHOU, Brad ZWERNEMANN
  • Publication number: 20220286050
    Abstract: A system may include a power converter having a maximum allowable input power drawn from a power source, an energy storage element coupled to an output of the power converter at a top plate of the energy storage element, wherein the energy storage element is configured to store excess energy, and control circuity configured to, when an input power of the power converter exceeds the maximum allowable input power, cause excess energy stored in the energy storage element to be consumed by circuitry coupled to the output of the power converter, and in order to maintain positive voltage headroom for the circuitry coupled to the output of the power converter, selectively couple a bottom plate of the energy storage element to the power source such that excess energy stored by the circuitry coupled to the output of the power converter is consumed from the energy storage device when the input power of the power converter exceeds the maximum allowable input power.
    Type: Application
    Filed: May 26, 2022
    Publication date: September 8, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Eric J. KING, Ajit SHARMA, Lingli ZHANG, Christian LARSEN, Graeme G. MACKAY
  • Publication number: 20220285299
    Abstract: A semiconductor die may be coupled to a printed circuit board using a solder ball. The semiconductor die comprises a redistribution layer formed above a semiconductor chip, a polymer layer formed on the redistribution layer, and an Under Bump Metallurgy (UBM) layer formed on the polymer layer. The polymer layer comprises a plurality of vias, which electrically couple the UBM layer to the redistribution layer. The entire UBM layer may be deposited with a continuously flat upper surface for coupling to the solder ball. The plurality of vias may be positioned such that they are centered on a point that is not central to the UBM layer.
    Type: Application
    Filed: May 19, 2022
    Publication date: September 8, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Yaoyu PANG, Steven A. ATHERTON
  • Publication number: 20220286046
    Abstract: Driver circuitry for driving a load based on an input signal, comprising: at least one variable boost stage comprising: first and second input nodes configured to receive a first voltage and a second voltage respectively; first and second flying capacitor nodes for connection to a flying capacitor therebetween; a network of switching paths for selectively connecting the first and second input nodes with the first and second flying capacitor nodes; an output stage for selectively connecting a driver output node to each of the first and second flying capacitor nodes; and a controller operable in a first boost mode to: control the output stage to selectively connect the driver output node to the first flying capacitor node; control the network of switching paths to switch connection of the second flying capacitor node between the first and second input nodes at a controlled duty cycle; and in a first charge top-up cycle, control the network of switching paths to connect the first input node to the first flying c
    Type: Application
    Filed: November 30, 2021
    Publication date: September 8, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Eric J. KING, Axel THOMSEN, Anthony S. DOY, Thomas H. HOFF, John L. MELANSON
  • Publication number: 20220286101
    Abstract: The present disclosure relates to amplifier circuitry (300) that includes a linear amplifier stage (110) that receives an input signal and outputs a first drive signal to an output node (302) and a switching amplifier stage (130) operable to output a second drive signal to the output node (302). A controller (340) is selectively operable in a first dual-amplifier mode, in which switching of the switching amplifier stage is controlled based on a current of the first drive signal, such that the current of the first drive signal does not exceed a first current threshold magnitude; and at least one other mode, in which the controller controls the switching amplifier stage such that the current of the first drive signal may exceed the first current threshold magnitude. The controller (340) selectively controls the mode of operation based on an indication (SSL) of signal level of the output signal.
    Type: Application
    Filed: March 2, 2021
    Publication date: September 8, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventor: John P. LESSO
  • Publication number: 20220278658
    Abstract: Class D amplifier circuitry comprising: modulator circuitry; and output stage circuitry, wherein the modulator circuitry is configured to: receive an input signal and first and second carrier signals, wherein the second carrier signal is offset in amplitude with respect to the first carrier signal; generate first and second modulated output signals, each of the first and second modulated output signals being based on the input signal and the first and second carrier signals; and generate a plurality of control signals for the output stage circuitry per signal period of the modulated output signals, wherein the plurality of control signals are based on the first and second modulated output signals, and wherein at least one of the plurality of control signals per signal period comprises a signal level transition.
    Type: Application
    Filed: February 26, 2021
    Publication date: September 1, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: John P. LESSO, David P. SINGLETON
  • Publication number: 20220276285
    Abstract: This application relates to current sensing, in particular for a signal processing circuit (500) for outputting an output signal (Sout) based on an input signal (Sin). An output stage (101) includes an output transistor (102) driven, in use, by a drive signal. A current monitor (501) is configured to monitor, in use, a first current through the output transistor, wherein the current monitor comprises a current sensor (105) having a sense transistor (106) configured to be driven based on the drive signal so as to generate a sense current related to the first current. A compensation controller (301) receives an indication of signal level of the input signal and controllably varies operation of the current monitor (501) so as to at least partially compensate for signal-dependent variation in a relationship between the first current and the first sense current.
    Type: Application
    Filed: February 23, 2022
    Publication date: September 1, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Tahir RASHID, Mehul MISTRY
  • Publication number: 20220268721
    Abstract: The present disclosure relates to circuitry for determining a temperature coefficient value of a resistor. The circuitry comprises circuitry for supplying an AC current signal to the resistor, circuitry for measuring a first voltage across the resistor when the AC current signal is supplied; and processing circuitry configured to determine the temperature coefficient value based on the first voltage.
    Type: Application
    Filed: February 25, 2021
    Publication date: August 25, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Ravi K. KUMMARAGUNTLA, Kathryn R. HOLLAND
  • Publication number: 20220271721
    Abstract: This application relates to circuitry for monitoring for instability of an amplifier. The amplifier (100) has a first signal path between an amplifier input (INN) and an amplifier output (VOUT) and a feedback path from the output to form a feedback loop with at least part of the first signal path. A comparator (212) has a first input configured to receive a first signal (INN) derived from a first amplifier node which is part of said feedback loop and a second input configured to receive a second signal (INP) derived from a second amplifier node which varies with the signal at the amplifier input but does not form part of said feedback loop. The comparator is configured to compare the first signal to the second signal and generate a comparison signal (COMP), wherein in the event of amplifier instability the comparison signal comprises a characteristic indicative of amplifier instability.
    Type: Application
    Filed: May 10, 2022
    Publication date: August 25, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Sameer BAVEJA, Hamed SADATI
  • Publication number: 20220271722
    Abstract: This application relates to circuitry for monitoring for instability of an amplifier. The amplifier (100) has a first signal path between an amplifier input (INN) and an amplifier output (VOUT) and a feedback path from the output to form a feedback loop with at least part of the first signal path. A comparator (212) has a first input configured to receive a first signal (INN) derived from a first amplifier node which is part of said feedback loop and a second input configured to receive a second signal (INP) derived from a second amplifier node which varies with the signal at the amplifier input but does not form part of said feedback loop. The comparator is configured to compare the first signal to the second signal and generate a comparison signal (COMP), wherein in the event of amplifier instability the comparison signal comprises a characteristic indicative of amplifier instability.
    Type: Application
    Filed: May 10, 2022
    Publication date: August 25, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Sameer BAVEJA, Hamed SADATI
  • Publication number: 20220271748
    Abstract: This application relates to methods and apparatus for driving a transducer with switching drivers where the switching driver has an output bridge stage for switching an output node between switching voltages and a modulator for controlling the duty cycle of the output bridge stage based on an input signal. The switching driver also includes a voltage controller for providing the switching voltages which is operable to provide different switching voltages in different driver modes. A controller is provided to control the driver mode of operation and the duty cycle of the switching driver based on the input signal, and the controller is configured to transition from a present driver mode to a new driver mode by controlling the voltage controller to provide the switching voltages for the new mode and controlling the modulator to vary the duty cycle of the output bridge stage. The change in duty cycle is controlled such that there is no substantial discontinuity in switching ripple due to the mode transition.
    Type: Application
    Filed: May 10, 2022
    Publication date: August 25, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: John L. MELANSON, Eric J. KING, Thomas H. HOFF, Axel THOMSEN
  • Publication number: 20220262215
    Abstract: A system may include an electromagnetic load capable of generating a haptic event and a haptic processor configured to receive at least one first parameter indicative of a desired perception of the haptic event to a user of a device comprising the electromagnetic load, receive at least one second parameter indicative of one or more characteristics of the device, and process the at least one first parameter and the at least one second parameter to generate a driving signal to the electromagnetic load in order to produce the desired perception to the user despite variances in the device that cause an actual perception of the haptic event to vary from the desired perception.
    Type: Application
    Filed: April 25, 2022
    Publication date: August 18, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Jeffrey D. ALDERSON, John L. MELANSON, Anthony S. DOY, Eric LINDEMANN
  • Publication number: 20220263520
    Abstract: A signal processing system may include a sensor readout channel configured to convert an electronic signal into a digital quantity, the sensor readout channel comprising an analog-to-digital converter (ADC) having an input and an output, first outside chopping switches located at the input of the ADC, and second outside chopping switches located at the output of the ADC. The ADC may comprise a memory element, first inside chopping switches located at the input of the memory element, and second inside chopping switches located at the output of the memory element. The first outside chopping switches, the second outside chopping switches, the first inside chopping switches, and the second inside chopping switches may be switched at the same frequency such that the memory element is swapped periodically in synchronization with the first outside chopping switches and second outside chopping switches.
    Type: Application
    Filed: April 16, 2021
    Publication date: August 18, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Axel THOMSEN, John L. MELANSON, Mujo KOZAK, Paul WILSON, Eric J. KING
  • Publication number: 20220260439
    Abstract: A method of controlling a force sensor system to define at least one button implemented by at least one force sensor, the method comprising: receiving a force sensor input; determining a gradient of the force sensor input; and controlling the force sensor system based on the determined gradient.
    Type: Application
    Filed: May 3, 2022
    Publication date: August 18, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Pablo PESO PARADA, Hamid SEPEHR
  • Publication number: 20220263519
    Abstract: A signal processing system may include a sensor readout channel configured to convert an electronic signal into a digital quantity. The sensor readout channel may include a first-order sigma-delta modulator having a modulator input and a modulator output, first outside chopping switches located at the modulator input, second outside chopping switches located at the modulator output, an auxiliary path comprising an analog-to-digital converter (ADC) having an auxiliary path input and an auxiliary path output, the auxiliary path input configured to receive as its input signal a signal output by a memory element of the first-order sigma-delta modulator, and a signal combiner configured to combine a modulator output signal generated by the first-order sigma-delta modulator with an auxiliary path output signal generated by the auxiliary path to generate a combined output signal.
    Type: Application
    Filed: February 9, 2022
    Publication date: August 18, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: John L. MELANSON, Axel THOMSEN, Mucahit KOZAK, Paul WILSON, Eric J. KING
  • Publication number: 20220254980
    Abstract: Circuitry for driving a transducer for an object detection system, the circuitry comprising drive circuitry configured to generate a drive waveform for the transducer, current monitor circuitry for monitoring a current through the transducer, and system identification circuitry. The system identification circuitry is configured to determine a characteristic of the transducer based on a first signal indicative of a drive voltage for the transducer and a second signal indicative of the current through the transducer. The circuitry is operative to adjust the drive waveform based on the determined characteristic of the transducer.
    Type: Application
    Filed: February 10, 2021
    Publication date: August 11, 2022
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: John Paul LESSO, Claire MOTION