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Analog Circuit Design by Jim Williams, Bob Dobkin

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26

Application considerations and circuits for a new chopper-stabilized op amp

Jim Williams

A great deal of progress has been made in op amp DC characteristics. Carefully executed designs currently available provide sub-microvolt VOS ΔT drift, low bias currents and open-loop gains exceeding one million. Considerable design and processing advances were required to achieve these specifications. Because of this, it is interesting to note that amplifiers with even better DC specification were available in 1963 (Philbrick Researches Model SP656). Although these modular amplifiers were large and expensive (≈3″ × 2″ × 1.5″ at $195.00 1963 dollars) by modern standards, their DC performance anticipated today’s best monolithic amplifiers while using relatively ...

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