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 /spl mu/m BiCMOS process with an active die area of 0.1 mm/sup 2/. The DC gain of this amplifier is 90 dB. The GBW and phase margin of this amplifier is 900 MHz and 47/spl deg/, respectively. The power dissipation is minimized by using BiCMOS technology and is about 25 mW for 2 pF load capacitance.
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