Patent ID: 6606025
Filing Date: 2003-08-12
Classification: G06K,H03D

Abstract:
A synchronous demodulator comprising:an output driver stage having a power supply input; and a coupling transformer having one inductor of the coupling transformer operably coupled in series between the power supply input and a power supply terminal of the synchronous demodulator for detecting variation in a load current of the output driver stage; wherein the output driver stage includes; a push-pull output driver having a first transistor and a second transistor; a center-tapped transformer wherein the first transistor drives one terminal of a center-tapped winding, and the second transistor drives a second terminal of the center-tapped winding; a first inductor coupled in series with the power supply input; and a second inductor operably coupled to develop a voltage selectively in response to current flow through the fast inductor corresponding to a sub-carrier of a received signal derived by modulating the signal of said output driver stage with said sub-carrier.