A high-accuracy CMOS oversampling current sample/hold (S/H) circuit using feedforward approach

Author

Huang, Renyuan ; Wey, Chin-Long

Author_Institution

Dept. of Electr. Eng., Michigan State Univ., East Lansing, MI, USA

Volume

1

fYear

1996

fDate

12-15 May 1996

Firstpage

65

Abstract

This paper presents a CMOS oversampling current sample/hold (S/H) circuit using a feedforward approach. The circuit is comprised of a switched-current integrator, a gain stage, and a current copier. The feedforward approach reduces the output swing of the integrator significantly, thus improving the stability and accuracy of the S/H circuit. The high accuracy is obtained with only one-order integration and a low oversampling ratio. Results show that the circuit can reach 60 dB signal-to-distortion (SDR) ratio with a signal bandwidth of 2 MHz, where the SCAN20 2 μm CMOS process and a 3.3 supply voltage are used

Keywords

CMOS analogue integrated circuits; analogue processing circuits; circuit stability; feedforward; sample and hold circuits; switched current circuits; 2 MHz; 2 micron; 3.3 V; SCAN20 CMOS process; current copier; feedforward; gain stage; high-accuracy operation; low oversampling ratio; one-order integration; oversampling current S/H circuit; sample/hold circuit; stability; switched-current integrator; Artificial intelligence; Bandwidth; Circuit stability; Clocks; Feedback circuits; Linearity; Signal processing; Switching circuits; Video signal processing; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1996. ISCAS '96., Connecting the World., 1996 IEEE International Symposium on

Conference_Location

Atlanta, GA

Print_ISBN

0-7803-3073-0

Type

conf

DOI

10.1109/ISCAS.1996.539809

Filename

539809