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Adaptive analog-to-digital converter (ADC) topology with dual processing paths for differential and common-mode signals

A digital converter and differential signal technology, applied in the field of analog-to-digital converters, can solve problems such as DC value mismatch and mismatch

Active Publication Date: 2021-04-09
CIRRUS LOGIC INT SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An example of additional processing is that a fully differential (FD) microphone 102 can provide V in and V ip , but these values ​​may not match each other, and may also not match the expected DC value for the ADC to operate correctly

Method used

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  • Adaptive analog-to-digital converter (ADC) topology with dual processing paths for differential and common-mode signals
  • Adaptive analog-to-digital converter (ADC) topology with dual processing paths for differential and common-mode signals
  • Adaptive analog-to-digital converter (ADC) topology with dual processing paths for differential and common-mode signals

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Embodiment Construction

[0034] figure 2 is a flowchart illustrating a method of detecting and adjusting the operation of an analog-to-digital converter (ADC) to match a microphone topology, according to one embodiment of the present disclosure. Method 200 begins at block 202 by monitoring the output of an analog-to-digital converter (ADC) receiving an analog input from a microphone. The monitored output can be, for example, a digital output or a pseudo-digital output from an ADC. Then, at block 204 , a coupling configuration for the microphone may be determined based on the monitored output of the ADC at block 202 . The determination may be made based on an instantaneous value at the ADC output, or may be made by evaluating the ADC output over a period of time. Next, at block 206, operation of an analog-to-digital converter (ADC) may be adjusted based on the determined coupling configuration of the microphone. Method 200 may be performed by a controller coupled to or integrated with an analog-to-d...

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Abstract

One way to process the microphone input in an ADC to determine the microphone configuration is to process the microphone input signal in two processing paths, where one processing path processes the difference between the differential input signals and the other processing path processes the difference between the differential input signals average value. The outputs of these processing paths can be combined to generate a digital signal representing the analog signal from the microphone. The digital signal contains a digital version of the audio in the environment around the microphone, but can also be used to detect microphone topology and configure aspects of the processing path to match the detected microphone topology. An arrangement for an ADC can implement the two processing paths as two delta-sigma modulator loops.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Patent Application No. 14 / 826,996, filed August 14, 2015, which is hereby incorporated by reference in its entirety. technical field [0003] This disclosure relates to analog-to-digital converters (ADCs). More specifically, portions of this disclosure relate to adapting ADCs to operate in accordance with different input device configurations. Background technique [0004] Microphones generate electrical signals that represent noise and sound in the environment around the microphone. A microphone is an essential piece of equipment for many electronic devices because sound, especially speech, is one of the most important means of interaction between a person and an electronic device and between a person and another person through an electronic device. Microphones typically produce analog signals, but processors within electronic devices are typically digital parts that operate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/12H03M3/00H04R19/04
CPCH03M1/12H04R19/04H03F3/45H03M1/1295H03M3/494H04R3/00H04R2499/11G11C27/024H03F3/005H03F3/45475H03F3/45959H04R29/004H03F2203/45421H03F2203/45512H03F2203/45544H03F2203/45551H03M3/496H03M1/004H03M3/392G06F3/16H03M3/04H03M1/14H03M1/124H03M3/458
Inventor R·赞巴吉Y·莫尔塔扎维A·布伦南J·L·梅兰桑
Owner CIRRUS LOGIC INT SEMICON