Active Bipolar Clamp

An active clamp circuit that passes its input unmodified (but inverted) if it is within the clamping thresholds.

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This circuit limits its output swing to a pair of thresholds by using two precision rectifiers to cancel out input swings that are too large.

The output is inverted relative to the input.

Note that if the thresholds are not symmetrical, the output will have a DC offset.

With the resistor values shown, the value of +/-Vclamp needs to be 2/3 of the desired clamping level.

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Active Bipolar Clamp PUBLIC