Inverting sample-and-hold amplifier requires no external resistors

摘要

Many applications require a sampling circuit whose out-rnput is inverted with regard to the respective sample of an input signal. Arnsimple approach is a cascade of a common noninverting sample-and-hold amplifier and an inverting amplifier. A classic inverting amplifier is an op amp with voltage feedback from two resistors. The values of these resistors, which are usually equal, should be high enough to decrease the total power lossrnof P = 2V~2/R, which is proportional to the square of the output voltage. The values of these resistors should be as low as possible to preserve the bandwidth rnof the op amp.