FEED_FORWARD_OPAMP

Published:2009/7/6 6:51:00 Author:May | From:SeekIC

DC input characteristics are determined by A1, which is bypassed at high frequencies, while AC-coupled A2 deter-mines dynamic performance. Resulting composite amplifier combines such desired properties as low input current and drift, large bandwidth and slew rate, and fast settling time. Compensation network C3-C4-C5 is chosen first to give desired bandwidth. Composite rolloff of 6 dB per octave is then obtained by narrow-banding A1 with R4 and C2, so gain-bandwidth product is equal to ratio between unity-gain crossover frequency of A2 and open-loop gain.-Fairchild Linear IC Contest Winners, EEE Magazine, Jan. 1971, p 48-49.



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