A receiver circuit includes an asynchronous demodulator having a demodulator input to receive a first signal and a demodulator output configured to provide a demodulated signal. The receiver circuit further includes a circuit, a multiplexer, and a synchronous demodulator. The modulator circuit includes a modulator input coupled to the demodulator output and includes a modulator output. The modulator re-modulates the demodulated signal to produce a second signal and provides the second signal to the modulator output. The multiplexer includes a first input to receive the first signal, a second input coupled to the modulator output to receive the second signal, a control input to a receive a select signal, and a multiplexer output. The synchronous demodulator includes an input coupled to the multiplexer output and an output to provide a demodulated output signal corresponding to a selected one of the first signal and the second signal.