Patent ID: 9136853
Filing Date: 2015-09-15
Classification: H03M

Abstract:
1. An analog to digital converter, comprising: a low pass filter element configured to filter an analog input signal; a quantizer configured to (i) receive an analog output signal that is based on the filtered analog input signal, and (ii) convert the analog output signal to a digital output signal; and a digital to analog converter configured to generate an analog feedback signal based on the digital output signal, wherein (i) the digital to analog converter is provided in a feedback path between an output of the quantizer and an input of the quantizer, (ii) the digital to analog converter is configured to selectively inject and absorb current associated with the feedback path in an amount proportional to a voltage at the input of the quantizer to reduce noise injected by the digital to analog converter, and (iii) the analog feedback signal is combined with the analog input signal at an input of the low pass filter element.