Motorola Corporation

Hans Staufer

Anthony D Newton

Michel Burri

A synchronous demodulator ( ) drives an output antenna ( ) with a push-pull driver circuit ( ). The push-pull driver circuit ( ) includes two transistors connected in a push-pull configuration driving a center-tapped transformer ( ). The transformer ( ) couples the push-pull driver circuit ( ) to an antenna ( ). Received signals are demodulated in the output driver circuit ( ).

Synchronous demodulator

An improved loop antenna (10) comprises first (12) and second (16) conductive loops. Each of the first and second conductive loops has a discontinuity (14, 18). The first and second conductive loops (12, 16) are arranged substantially concentrically to form a capacitive coupling such that the tuned frequency of the loop antenna (10) has improved protection from external capacitance effects.

Growing community of inventors

Le Vaud, Switzerland

Hans Staufer