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Micropower Dead Zone Generator

Opamp in lower left functions as a polarity detect comparator, controlling the FET switches in the circuit. The upper left stage in conjunction with the FET, functions as an absolute value circuit so that only positive signal representation passes to the dead-zone function. Q2 is held in cutoff by the control voltage on Q3, so when the signal exceeds the deadband, a signal passes to the central section that operates as an inverting stage. Depending on the FET control, the output section to the right either inverts or simply buffers the signal to restore the original signal polarity.

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