Patent ID: 7705764
Filing Date: 2010-04-27
Classification: H03M

Abstract:
1. An algorithmic Analog-To-Digital converter (ADC) having an external ADC circuit and a Multiplying Digital-to-Analog Converter (MDAC), the MDAC comprising: a Digital-to-Analog Converter (DAC) for converting a first digital signal into an analog signal; a subtractor for calculating a difference between the signal output from the DAC and an analog signal output from a first Sample and Hold Amplifier (SHA); an amplifier for amplifying the difference; a first capacitor unit connected with an output end of the first SHA and an input end of the amplifier through a first switching unit; a second capacitor unit connected with the input end and an output end of the amplifier through a second switching unit; and a third capacitor unit connected with the input end and the output end of the amplifier through a third switching unit, wherein the first capacitor is configured to receive a signal from the first SHA and output the signal to the amplifier to be amplified, wherein the amplifier is configured to output the amplified signal to the second capacitor and to the external ADC circuit, so that the amplified signal stored in the second capacitor can be feedback to the amplifier and an output from the external ADC circuit can be provided to the second capacitor, and wherein the third capacitor is configured to receive an output signal from the amplifier, where the output signal is generated by the amplifier according to the feedback signal received from the second capacitor.