An RFID circuit comprises an RF carrier signal source, a hybrid coupled to
the RF carrier signal source operable to generate an in-phase and a
quadrature phase component of the RF carrier signal, a switch coupled to
the hybrid operable to pass one of the in-phase and quadrature phase
components of the RF carrier signal to its output, and a mixer coupled to
the output of the switch operable to multiply one of the in-phase and
quadrature phase component of the carrier signal and a received modulated
carrier signal and generate a baseband signal.