| 摘要 |
A sample & hold amplifier (SHA) is particularly for systems requiring a fast and highly accurate analog storage of a instantaneous value of an input voltage. The SHA essentially comprises a comparator, integrator and control circuit. The comparator solves the problem of an amplifier overdrive and the integrator enforces a most desirable operation of an operational amplifier. The output voltage of the integrator and the input voltage of the SHA are applied to the comparator which provides an output signal to the control circuit. The output voltage of the integrator is changing linearly. The polarity of its slope is determined by the comparator so that the integrator output voltage can reach the value of the input voltage of the SHA, and is further stored when the integration is terminated.
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