Fleshner & Kim, LLP
Analog/digital converting circuit
 An analog/digital (A/D) converting circuit is provided that stabilizes system operation, reduces power consumption in an analog circuit region and uses a selected metal-to-metal capacitor, which has a small parasitic capacitance value. The A/D converting circuit includes a first sample/hold amplifier for sampling/holding an analog input signal, a switch for selecting one of a signal outputted from the first sample/hold amplifier and a feedback signal and an A/D sub-converter for converting an analog signal outputted from the switch to a digital signal. A multiplying D/A converting block converts an output signal from the A/D sub-converter to an analog signal and amplifies a difference value obtained between the analog signal and the analog signal outputted from the switch. A second sample/hold amplifier samples/holds a signal outputted from the multiplying D/A converting block and outputs the feedback signal to the switch. A digital correcting unit outputs an N bit digital signal by superimposing output signals from the A/D sub-converter by 1 bit and a timing controller generates a control signal and a timing clock signal for the operation of each unit. 
Hyundai Electronics Industries Co., Ltd.
H
H03M
inventional
Seung-Hoon Seung Woo Dong-Young Yong-In Jae-Yup
Lee Park Chang Park Lee