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    Enhancing dynamic range based on spectral content of signal
    11.
    发明授权
    Enhancing dynamic range based on spectral content of signal 有权

    公开(公告)号：US09813814B1

    公开(公告)日：2017-11-07

    申请号：US15244670

    申请日：2016-08-23

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Aniruddha Satoskar ,  Tejasvi Das ,  Ku He

    IPC: H04R3/00 ,  H04R3/04 ,  H03G3/30 ,  H03K5/1536

    CPC classification number: H04R3/04 ,  H03G3/02 ,  H03G3/3005 ,  H03G3/3089 ,  H03K5/1536

    Abstract: In accordance with embodiments of the present disclosure, an apparatus for providing an output signal to an audio transducer may include a signal path and a control circuit. The signal path may include an analog signal path portion having an audio input for receiving an analog signal, an audio output for providing an output signal, and a selectable analog gain, and configured to generate the output signal based on the analog signal and in conformity with the selectable analog gain and a digital path portion having a selectable digital gain and configured to receive a digital input signal and convert the digital input signal into the analog signal in conformity with the selectable digital gain. The control circuit may be configured to determine a spectral content of a signal indicative of the output signal and change the selectable digital gain and the selectable analog gain based on the spectral content.

    ADC circuitry
    15.
    发明授权
    ADC circuitry 有权

    公开(公告)号：US11528031B2

    公开(公告)日：2022-12-13

    申请号：US17184295

    申请日：2021-02-24

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Andrew J. Howlett ,  David P. Singleton ,  Aniruddha Satoskar

    IPC: H03M1/00 ,  H03M1/12 ,  H03F3/217 ,  H03G3/00 ,  H03G9/00 ,  H03M1/08

    Abstract: This application relates to ADC circuitry. An ADC circuit (200) has first and second conversion paths (201a, 201b) for converting analogue signals to digital and is operable in first and second modes. In the first mode, the first and second conversion paths are connected to respective first and second input nodes (202a, 202b) to receive and convert full scale first and second analogue input signals (Ain1, Ain2) to separate digital outputs (Dout1, Dout2). In the second mode, the first and second conversion paths are both connected to the first input node (202a), to convert the first analogue input signal (Ain1) to respective first and second digital signals, and the first and second conversion paths are configured for processing different signal levels of the first analogue input signal. A selector (207) select the first digital signal or the second digital to be output as an output signal based on an indication of amplitude of the first analogue input signal.

    Multi-path analog system with multi-mode high-pass filter
    16.
    发明授权
    Multi-path analog system with multi-mode high-pass filter 有权

    公开(公告)号：US10566989B2

    公开(公告)日：2020-02-18

    申请号：US16168067

    申请日：2018-10-23

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： Ramin Zanbaghi ,  Daniel J. Allen ,  John L. Melanson ,  Aniruddha Satoskar ,  Akshay Godbole

    IPC: H03M1/12 ,  H03M1/18 ,  H04R3/04 ,  H03H19/00 ,  H03M1/00 ,  H04L25/06 ,  H03G3/30 ,  H03M1/80

    Abstract: A system may comprise a high-pass filter having an input for receiving an input signal, an output for generating an output signal, a capacitor coupled between the input and the output, a switched-capacitor resistor coupled between the output and a reference voltage, and control circuitry configured to control the reference voltage to cancel current leakage into a circuit coupled to the output. The input, the output, the capacitor, and the switched-capacitor resistor may be arranged to generate the output signal as a high-pass filtered version of the input signal and the high-pass filter may be configured to operate in a plurality of modes comprising at least a high-impedance mode and a low-impedance mode in which the resistance of the switched-capacitor resistor is significantly smaller than the resistance when in the high-impedance mode.A system may include a plurality of processing paths having a first path configured to generate a first digital signal based on an analog input signal and a second path configured to generate a second digital signal based on the analog input signal, the second path having a high-pass filter for filtering the analog input signal prior to the analog input signal being processed by the remainder of the second path, and the high-pass filter having a corner frequency. Control circuitry may be configured to determine frequency-dependent weighted proportions of the first and second digital signals to be combined into an output digital signal based on a characteristic of the analog input signal. Frequency-dependent weighted proportions may be such that the digital output signal includes spectral content of the first digital signal below the corner frequency to account for spectral content of the second digital signal below the corner frequency being filtered.A system may include an input for receiving an input signal, an output for generating an output signal, a capacitor coupled between the input and the output, a variable resistor coupled to the output and having a plurality of modes including a first mode in which the variable resistor has a first resistance and a second mode in which the variable resistor has a second resistance, and control circuitry configured to determine a difference between the input signal and the output signal and switch between modes of the plurality of modes when the difference is less than a predetermined threshold.

    Multi-path analog front end and analog-to-digital converter for a signal processing system with low-pass filter between paths
    19.
    发明授权
    Multi-path analog front end and analog-to-digital converter for a signal processing system with low-pass filter between paths 有权
    多路径模拟前端和模数转换器，用于信号处理系统，路径之间具有低通滤波器

    公开(公告)号：US09543975B1

    公开(公告)日：2017-01-10

    申请号：US14982767

    申请日：2015-12-29

    Applicant: Cirrus Logic International Semiconductor Ltd.

    Inventor： John L. Melanson ,  Aniruddha Satoskar

    IPC: H03M1/12

    CPC classification number: H04R3/04 ,  H03G3/3005 ,  H03G3/3089 ,  H03M1/12 ,  H03M1/121 ,  H03M1/188 ,  H03M3/468 ,  H03M3/488

    Abstract: In accordance with embodiments of the present disclosure, a processing system comprising may include a plurality of processing paths and a filter. The plurality of processing paths may include a first processing path and a second processing path, wherein the first processing path is configured to generate a first digital signal based on an analog input signal and the second processing path is configured to generate a second digital signal based on the analog input signal. The filter may have a corner frequency and may be configured to generate a filtered digital output signal combining spectral components of the first digital signal lower than the corner frequency and spectral components of the second digital signal higher than the corner frequency to generate a filtered digital signal.

    Abstract translation: 根据本公开的实施例，包括可以包括多个处理路径和过滤器的处理系统。 多个处理路径可以包括第一处理路径和第二处理路径，其中第一处理路径被配置为基于模拟输入信号生成第一数字信号，并且第二处理路径被配置为基于第二处理路径生成第二数字信号 对模拟输入信号。 滤波器可以具有转角频率并且可以被配置为生成滤波的数字输出信号，其合成低于转角频率的第一数字信号的频谱分量和高于转折频率的第二数字信号的频谱分量，以产生经滤波的数字信号 。

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