Title :
Large bandwidth BiCMOS operational amplifiers for SC video applications
Author :
Nebel, Gerhard ; Kleine, Ulrich ; Pfleiderer, Hans-Jörg
Author_Institution :
Siemens AG, Munich, Germany
fDate :
6/1/1996 12:00:00 AM
Abstract :
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 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 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
Keywords :
BiCMOS analogue integrated circuits; differential amplifiers; operational amplifiers; switched capacitor networks; transfer functions; video amplifiers; video signal processing; wideband amplifiers; 1 micron; 5 V; 68 dB; BiCMOS operational amplifiers; DC-gain; active die area; amplifier bandwidth; current mirroring; current source output load; differential broadband amplifier; folded cascode gain stage; modified bipolar Wilson current mirror; single-ended amplifier; switched-capacitor video applications; transfer functions; unity gain frequency; Bandwidth; BiCMOS integrated circuits; Broadband amplifiers; Differential amplifiers; Frequency; Mirrors; Operational amplifiers; Power amplifiers; Power measurement; Transfer functions;
Journal_Title :
Solid-State Circuits, IEEE Journal of
