Patent ID: 8723708
Filing Date: 2014-05-13
Classification: H03M

Abstract:
1. A successive approximation analog to digital (A/D) converter, comprising: a sample circuit, for sampling an analog voltage from an analog signal; a conversion circuit, coupled to the sample circuit, for converting the analog voltage into a digital voltage; and a filtering control circuit, coupled to the sample circuit and the conversion circuit, for transmitting a filtering control signal to the sample circuit according to the digital voltage; wherein the sample circuit further samples a next analog voltage from the analog signal and adjusts the next analog voltage into an adjusted analog voltage according to the filtering control signal, the conversion circuit further converts the adjusted analog voltage into a next digital voltage, and the next digital voltage is a filtered digital voltage; and wherein the next digital voltage is generated according to that the next analog voltage plus a product of the digital voltage with a filtering factor so that the next digital voltage has a low-pass filtering characteristic.