SIGNAL POLARITY SWITCHING CIRCUIT

摘要

PURPOSE:To simplify the circuit configuration and to reduce the cost of a signal polarity switching circuit by adding the polarity-inverted output by an amplifier and the output led in the same polarity by an amplifier. CONSTITUTION:An analog switch SW1 is closed when a control signal Y is logic ''1'' and opened when ''0''. An amplifier 1 which has an amplification factor A produces an output AX inverted in the polarity of an input signal X. An amplifier 2 which has an amplification factor B produces an output BX amplified from the signal X. An adder 3 always inputs the output AX of the amplifier 1, selectively inputs the output BX of the amplifier 2 in response to a control signal Y, selectively adds the output BY to the output AX to obtain an output signal Z of AX or (AX+BX).