EXCESS LOOP DELAY COMPENSATION (ELC) FOR AN ANALOG TO DIGITAL CONVERTER (ADC)

摘要

In one embodiment, a circuit includes a quantizer configured to convert an analog input signal to a digital signal. The quantizer includes a first feedback path including a first digital to analog converter (DAC) coupled from an output of the quantizer to a summing junction that is coupled to an input of the quantizer. The first feedback path converts the digital signal to a first corresponding analog value for combining with the analog input signal at the summing junction. Also, the quantizer includes a plurality of excess loop delay (ELD) compensation paths coupled to the summing junction configured to compensate for excess loop delay from a second feedback path coupled from the output of the quantizer to input of the quantizer via a loop filter. Second DACs in the second feedback path convert the digital signal to a second corresponding analog value for combining with the analog input signal.

主权项

1. A circuit comprising:
a quantizer configured to convert an analog input signal to a digital signal, the quantizer comprising: a first feedback path including a first digital to analog converter (DAC) coupled from an output of the quantizer to a summing junction that is coupled to an input of the quantizer, wherein the first feedback path converts the digital signal to a first corresponding analog value for combining with the analog input signal at the summing junction; and a plurality of excess loop delay (ELD) compensation paths coupled to the summing junction configured to compensate for excess loop delay from a second feedback path coupled from the output of the quantizer to input of the quantizer, wherein a set of second DACs in the second feedback path convert the digital signal to a second corresponding analog value for combining with the analog input signal.