Patent ID: 9065474
Filing Date: 2015-06-23
Classification: H03M

Abstract:
1. An analog-to-digital signal processing system comprising: first and second signal processing channels, including respective inputs configured to receive an analog input signal that is time-multiplexed such that the input of the first signal processing channel receives the input signal during a first phase and the input of the second signal processing channel receives the input signal during a second phase; a first feedback circuit, including a first DAC circuit, coupling information from the output of the first signal processing channel to the input of the first signal processing channel during both of the first and second phases; a second feedback circuit, separate from the first feedback circuit and including a second DAC circuit, coupling information from the output of the second signal processing channel to the input of the second signal processing channel during both of the first and second phases; and a supply circuit configured to supply a current signal to each of the first and second DAC circuits, the supply circuit comprising at least two current sources coupled to a chop circuit, and the chop circuit is configured to selectively couple currents from the at least two current sources to the first and second DAC circuits according to a specified duty cycle.