Title :
A BiCMOS wideband operational amplifier with 900 MHz gain-bandwidth and 90 dB DC gain
Author :
Ehsanian, Mehdi ; Kaminska, Bozena
Author_Institution :
Ecole Polytech., Montreal Univ., Que., Canada
Abstract :
A fully differential operational amplifier has been designed and fabricated for analog-to-digital converter application. The amplifier mainly consists of folded cascode structure with current source as output loads and common-mode feedback circuits. The technique of feed-forward compensation is used in order to improve the settling time and gain bandwidth (GBW) of this amplifier. This amplifier is integrated in 0.8 μm BiCMOS process with an active die area of 0.1 mm2. The DC gain of this amplifier is 90 dB. The GBW and phase margin of this amplifier is 900 MHz and 47°, respectively. The power dissipation is minimized by using BiCMOS technology and is about 25 mW for 2 pF load capacitance
Keywords :
BiCMOS analogue integrated circuits; analogue-digital conversion; compensation; differential amplifiers; feedback amplifiers; feedforward; operational amplifiers; 0.8 micron; 2 pF; 25 mW; 90 dB; 900 MHz; ADC application; BiCMOS process; analog/digital converter application; common-mode feedback circuits; current source as output load; feedforward compensation; folded cascode structure; fully differential opamp; gain bandwidth; settling time; wideband operational amplifier; Analog-digital conversion; Bandwidth; BiCMOS integrated circuits; Broadband amplifiers; Capacitance; Differential amplifiers; Feedback circuits; Feedforward systems; Operational amplifiers; Power dissipation;
Conference_Titel :
Circuits and Systems, 1996. ISCAS '96., Connecting the World., 1996 IEEE International Symposium on
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3073-0
DOI :
10.1109/ISCAS.1996.539836
