Large bandwidth BiCMOS operational amplifiers for SC video applications

A single-ended and a fully differential broadband BiCMOS operational amplifier for switched-capacitor video applications are presented. The amplifiers feature a folded cascode gain stage with a current source as output load. For the single-ended amplifier the current mirroring is accomplished with a...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 1996-06, Vol.31 (6), p.828-834
Main Authors: Nebel, G., Kleine, U., Pfleiderer, H.-J.
Format: Article
Language:English
Subjects:
Bandwidth
BiCMOS integrated circuits
Broadband amplifiers
Differential amplifiers
Frequency
Mirrors
Operational amplifiers
Power amplifiers
Power measurement
Transfer functions
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Summary:A single-ended and a fully differential broadband BiCMOS operational amplifier for switched-capacitor video applications are presented. The amplifiers feature a folded cascode gain stage with a current source as output load. For the single-ended amplifier the current mirroring is accomplished with a modified bipolar Wilson current mirror at the output of the differential pair. Symbolic expressions for the transfer functions for both amplifiers are derived. The amplifiers are integrated in an analog 1 /spl mu/m BiCMOS process with an active die area of 0.72 mm/sup 2/ and 0.96 mm/sup 2/ for the single-ended and the fully differential amplifier, respectively. For both amplifiers a DC-gain of 68 dB and a unity gain frequency greater than 250 MHz was measured for a power supply voltage of 5 V.
ISSN:0018-9200
1558-173X
DOI:10.1109/4.509869