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Analog signal sample-and-hold circuit

The sample-and-hold circuit is used to record and store the value of an analog signal. The circuit based on ideal operational amplifiers is shown in Fig. 1.

Fig. 1. Circuit based on ideal operational amplifiers

When the contacts of K2 are closed, the value recorded in the capacitor C1 is reset. When the contacts of S1 are closed, the value of Uin is recorded in C1. When K1 is opened, the recorded value is stored in C1.

Operational amplifiers with MOSFET transistors at the input should be used as DA2. Capacitors with low leakage current and low charge absorption in the dielectric should be used as C1.

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Analog signal sample-and-hold circuit

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