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A low-output-impedance fully differential op amp with large output swing and continuous-time common-mode feedback

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1 Author(s)
J. N. Babanezhad ; Sierra Semiconductor Corp., San Jose, CA, USA

A fully differential (zero common-mode voltage) op amp has been developed which has low output impedance, but unlike source-follower output stages, it has a large output swing, namely, 8 Vp-p for 1-kΩ load and a 5-V supply. The output stage, which is a combination of common-source and source-follower stages, is driven by the two complimentary outputs of the differential-output input stage. A continuous-time common-mode feedback circuit has been used, which due to the op amp's low output impedance, causes negligible open-loop gain (95 dB) degradation. Floating compensation capacitors are used in order to reduce the capacitance value and, hence, the area (490 mil2)

Published in:

IEEE Journal of Solid-State Circuits  (Volume:26 ,  Issue: 12 )