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    Sampling of the gain of SMP04 and the op amp to keep the amplifying circuit

     

    Key words: SMP04, sample and hold, an amplifier circuit, operational amplifier, the gain As shown in FIG SMP04 gain by the operational amplifier 10 is configured to sample and hold amplifier circuit. SMP04 in the feedback loop circuit in the operational amplifier OP490, when a non-S / H = 0 when, SMP04 internal switch is closed, the feedback loop of the operational amplifier OP490 is turned on, the gain of the operational amplifier circuit and a feedback resistor decision itself, FIG gain is set to 10, the amplified sample voltage output terminal. When a non-S / H = 1, SMP04 internal switch is turned off, the operational amplifier OP490 feedback loop can not be formed, holding the output terminal of the last capacitor of the sampled voltage, and not affect the input signal internally. Two diodes 1N914 operational amplifier output terminal from the clamping action, prevent amplifier saturation when SMP04 hold. Read more

     

     

     

     

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