Low distortion switched-capacitor event-driven analog to digital converter

摘要

An event-driven tracking analog to digital converter (ADC) architecture is proposed. The proposed architecture has less sensitivity to amplifier and DAC non-linearity, reduces the swing and dynamic common-mode range requirement of the operational transconductance amplifier (OTA) and comparators, respectively.

主权项

1. An event-driven analog-digital converter comprising:
a driver amplifier; comparators; an analog up and down counter; an integrator; and a Gray-code counter for providing a continuous-in-time and discrete-in-amplitude output,
wherein the output of the driver amplifier is applied to the positive and negative inputs of said comparators, the outputs of the comparators are applied to the input of said analog counter and said integrator,wherein the input signal of the driver amplifier undergoes a subtraction from a feedback signal which is the output of said analog counter and said integrator such that the driver amplifier processes the tracking error.