A high speed fully-differential operational amplifier realized in 2μ-BiCMOS technology is proposed. Input MOS buffers allow to use this op amp inSC circuits with high clock frequency (up to 75MHz). The gain stage is realized with resistively loaded bipolar devices. No Common Mode Feedback is requiring saving area, power and increasing speed. The op amp presents a dc gain of about 46dB with a unity gain frequency as large as 700 MHz with 1.5pF load. Measured performance of closed-loop settling time (1%) is about 12nsec.
Baschirotto, A., Alini, R., Castello, R., Montecchi, F. (1993). High-speed BiCMOS operational amplifier for switched-capacitor circuits. In 1993 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS : PROCEEDINGS, VOLS 1-4 ( ISCAS 93 ): SIGNAL PROCESSING : ANALOG CIRCUITS AND FILTERS : VLSI AND PARALLEL PROCESSING ; NETWORKS, SYSTEMS AND APPLICATIONS (pp.998-1001) [10.1109/ISCAS.1993.393892].
High-speed BiCMOS operational amplifier for switched-capacitor circuits
BASCHIROTTO, ANDREA;
1993
Abstract
A high speed fully-differential operational amplifier realized in 2μ-BiCMOS technology is proposed. Input MOS buffers allow to use this op amp inSC circuits with high clock frequency (up to 75MHz). The gain stage is realized with resistively loaded bipolar devices. No Common Mode Feedback is requiring saving area, power and increasing speed. The op amp presents a dc gain of about 46dB with a unity gain frequency as large as 700 MHz with 1.5pF load. Measured performance of closed-loop settling time (1%) is about 12nsec.
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