公开(公告)号：US10069483B1

公开(公告)日：2018-09-04

申请号：US15680987

申请日：2017-08-18

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ramin Zanbaghi ,  Siladitya Dey ,  Daniel J. Allen ,  John L. Melanson ,  Aniruddha Satoskar

IPC: H03H19/00 ,  H03H15/02 ,  H03H17/02 ,  H04B1/26 ,  H03M1/12 ,  H03H11/04 ,  H03M1/06

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.