| 摘要 |
PROBLEM TO BE SOLVED: To provide a peak hold circuit allowing improvement of a rising/ falling time, allowing accurate control of a droop rate (a decrease rate), and capable of maintaining accuracy, with a relatively simple circuit and a small number of elements. SOLUTION: This feedback type peak hold circuit having both a capacity means C1 and an emitter follower Q5 provided in an output stage of a differential amplifier circuit to give feedback is provided with clamp circuits P4, Q4 for clamping a collector of a feedback side transistor Q2 in the differential amplifier circuit comprising npn transistors Q1, Q2 and pnp transistors P1, P2.
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