Abstract: An analog switch having a first feedback amplifier supplied with a signal superposed with a bias voltage and a second feedback amplifier supplied with the bias voltage. Each amplifier has a differential amplifier formed of two symmetrically connected transistors and having an output connected to both a common output terminal and its input through an impedance transforming transistor. The differential amplifier is biased by a constant current source formed of a transistor and a diode. In the presence of a control signal, the first amplifier is closed through the normal operation of its constant current source while the second amplifier is opened by disabling its constant current source. In the absence of the control signal, the first and second amplifiers are opened and closed, respectively.