| 摘要 |
A linear switch is incorporated into an active sample and hold switch. The active sample and hold circuit is symmetric and configured to accept a balanced input. Two linear switches couple a positive input signal of the balanced input to two different sampling capacitors. After the sampling capacitors are charged, another set of switches configures the sampling capacitors such that one of the sampling capacitor is in the feed back of an op amp and the other is connected from the input of the op amp to ground. In this configuration, the circuit has a gain of two and the output of the op a mp is twice the voltage sampled by the sampling capacitors.
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