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1. (WO2018220353) ANALOGUE SIGNAL PATHS

Pub. No.:    WO/2018/220353    International Application No.:    PCT/GB2018/051441
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Sat May 26 01:59:59 CEST 2018
IPC: H03M 3/00
H03M 1/18
H03M 1/70
H03F 3/217
Applicants: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LIMITED
Inventors: LESSO, John Paul
Title: ANALOGUE SIGNAL PATHS
Abstract:
This application relates to audio circuits, such as audio driving circuits, with improved audio performance. An audio arrangement (200) has an audio circuit (201) with a forward signal path between an input (102) for an input digital audio signal (DIN) and an output (103) for an output analogue audio signal (ΑOUT). The circuit also has a feedback path comprising an analogue-to-digital conversion module (202) for receiving an analogue feedback signal (VFB) derived from the output analogue audio signal and outputting a corresponding digital feedback signal (DFB). The analogue-to-digital conversion module (202) has an ADC (108), an analogue gain element (203) configured to apply analogue gain (GA) to the analogue feedback signal before the ADC and a digital gain element (204) for applying digital gain (GD) to a signal output from the ADC. A gain controller (205) controls the analogue gain and the digital gain applied based on the input digital audio signal (DIN).