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Programmable Gain Amplifier (Single Supply)

Programmable Gain Amplifier (Single Supply)

The CMOS switch selects which feedback node is used, thus setting the loop gain to different levels as desired. The advantage of this circuit is that the capacitance and leakage effects are isolated from the feedback resistors so accuracy is maintained. The deselected opamp sections saturate, but remain well behaved with the LT1079.