Patent ID: 6127958
Filing Date: 2000-10-03
Classification: H03M

Abstract:
An analog/digital (A/D) converting circuit, comprising:a first sample/hold amplifier that samples/holds an analog input signal;a switch that selects one of an analog output signal from the first sample/hold amplifier and an analog feedback signal;an A/D sub-converter that converts an analog output signal from the switch to a digital signal;a digital/analog (D/A) sub-converter that converts the digital signal from the A/D sub-converter to a converted analog signal;a subtracter that generates a difference value between the analog output signal from the switch and the converted analog signal;a voltage amplifier that amplifies the difference value from the subtracter;a second sample/hold amplifier that samples/holds an output signal from the voltage amplifier and outputs the feedback signal to the switch; anda digital correcting unit coupled to the A/D sub-converter that outputs an N bit digital signal in a plurality of cycles.