phase shorting switch

Abstract

An analog-to-digital converter (ADC) may include the ability to sense and / or compensate for undesired effects when receiving input from a microphone. For example, a sensing node may be provided between a differential input and separated from said differential input by two or more switches. The sense node may allow measurement of the average voltage of the differential input. The average voltage of the activated switches can be obtained to sample the capacitor coupled to the differential input. This average voltage can be used as common mode (CM) data. The controller can receive CM data as well as differential mode (DM) data and use the CM and DM data to determine undesired effects such as DC or AC mismatch at the microphone interface. The controller can then generate a signal for applying compensation to the differential input to reduce or eliminate undesired effects.

Description

[0001] Cross references to related patent applications [0002] This application claims the benefit of U.S. Patent Application No. 15 / 236,163, filed August 12, 2016, by Zanbaghi ​​et al., entitled "Phase Shorting Switch," which was filed by Zanbaghi ​​et al. in 2015 Continuation-in-part of U.S. Patent Application No. 14 / 826,996, filed August 14, entitled "Dual Processing Paths for Differential Mode and Common Mode Signals for an Adaptable Analog-To-Digital Converter (ADC) Topology," which Each of the applications in is incorporated herein by reference. 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 man...

AI Technical Summary

Problems solved by technology

In the AC magnitude mismatch of Figure 1G, there is no offset shift on the output code, but the mismatch induces a gain scaling that can lead to symmetric clipping in the quantizer

[0010] Although the above describes undesired effects during fully differential (FD) operation, undesired effects can also occur during pseudo differential (PD) operation, where one input is coupled to ground and the other produces the signal V ip =V cmi +V dm

In pseudo-differential (PD) operation, unbalanced DC shifts between the differential outputs of components in the ADC may cause swing-driven distortions (such as those caused by even harmonics)

This undesired effect also leads to poor ADC performance

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