Title :
High-speed BiCMOS operational amplifier for switched-capacitor circuits
Author :
Baschirotto, A. ; Alini, R. ; Castello, R. ; Montecchi, F.
Author_Institution :
Dipartimento di Elettronica, Univ. di Padova, Italy
Abstract :
A high-speed fully-differential operational amplifier (op-amp) realized in 2-μ BiCMOS technology is proposed. Input MOS buffers allow the use of this op-amp in switched capacitor (SC) circuits with high clock frequency (up to 75 MHz). The gain stage is realized with resistively-loaded bipolar devices. No common mode feedback is required. This saves area and power and increases speed. The op-amp presents a DC gain of about 46 dB with a unity-gain frequency as large as 700 MHz with 1.5 pF load. The measured performance of closed-loop settling time (1%) is about 12 ns
Keywords :
BiCMOS analogue integrated circuits; differential amplifiers; feedback amplifiers; operational amplifiers; switched capacitor networks; 1.5 pF; 12 ns; 2 micron; 46 dB; 700 MHz; 75 MHz; BiCMOS operational amplifier; DC gain; MOS buffers; clock frequency; closed-loop settling time; fully-differential operational amplifier; gain stage; resistively-loaded bipolar devices; speed; switched-capacitor circuits; unity-gain frequency; BiCMOS integrated circuits; Circuit testing; Clocks; Feedback; Frequency; Operational amplifiers; Performance gain; Resistors; Switched capacitor circuits; Voltage;
Conference_Titel :
Circuits and Systems, 1993., ISCAS '93, 1993 IEEE International Symposium on
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-1281-3
DOI :
10.1109/ISCAS.1993.393892
