Title :
Large bandwidth BiCMOS operational amplifiers for SC-video-applications
Author :
Nebel, G. ; Kleine, U. ; Pfleiderer, H.J.
Author_Institution :
Allgemeine Elektrotech. und Mikroelektronik, Ulm Univ., Germany
fDate :
30 May-2 Jun 1994
Abstract :
Two single-ended and one fully differential high-frequency BiCMOS operational amplifiers for switched-capacitor video-applications are presented. The amplifiers feature a folded cascode structure with current sources as output loads. For the single-ended amplifiers the current mirroring is accomplished with bipolar transistors at the output of the differential pair. The common-mode feedback circuitry of the differential amplifier uses two nested differential input pairs. The amplifiers are integrated in an analog 1 μm BiCMOS process,with an active die area of 0.72 mm2 and 0.96 mm2 for the single-ended and the fully differential amplifier, respectively. For all amplifiers a dc-gain of 68 dB and a unity gain frequency greater than 200 MHz was obtained
Keywords :
BiCMOS analogue integrated circuits; HF amplifiers; differential amplifiers; feedback amplifiers; operational amplifiers; switched capacitor networks; video amplifiers; video signal processing; wideband amplifiers; 1 micron; 200 MHz; 68 dB; BiCMOS operational amplifiers; DC-gain; active die area; analog process; bandwidth; bipolar transistors; common-mode feedback circuitry; current mirroring; current sources; folded cascode structure; fully differential amplifier; high-frequency amplifiers; single-ended amplifiers; switched-capacitor video-applications; unity gain; Bandwidth; BiCMOS integrated circuits; Bipolar transistors; Differential amplifiers; Feedback circuits; Frequency; Mirrors; Operational amplifiers; Signal processing; Switching circuits;
Conference_Titel :
Circuits and Systems, 1994. ISCAS '94., 1994 IEEE International Symposium on
Conference_Location :
London
Print_ISBN :
0-7803-1915-X
DOI :
10.1109/ISCAS.1994.409307
