Damping modulation circuit for a full-duplex transponder

Details Damping modulation circuit for a full-duplex transponder Damping modulation circuit for a full-duplex transponder

1997-01-31

2000-12-26

Urban, Edward F.

Telecommunications

Transmitter and receiver at separate stations

Short range rf communication

455 42, 342 51, 340505, H04B 500

Patent

active

06167236&

ABSTRACT:
An improved damping modulation circuit (140) for a transponder (14) receives energy transmitted from a transmitter/receiver antenna (16) to produce a unique recognition signal in the transponder. The improved damping modulation circuit (140) includes a high fieldstrength circuit (152, 160, 174) that protects full-duplex transponder (14) from over-voltage through the use of voltage limiters (132), while still providing power to transponder (14). Low fieldstrength circuit (152) activates only minimal circuitry to provide the highest possible amount of power to full-duplex transponder (14). Medium fieldstrength circuit (152, 160) increases the fieldstrength in full-duplex transponder (14) for establishing a sufficient amount of current flow for proper modulation using only a medium amount of transponder (14) circuit elements.

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patent: 5870031 (1999-02-01), Kaiser et al.

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