Switched capacitor load compensator

Details Switched capacitor load compensator Switched capacitor load compensator

1991-11-04

1994-06-07

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455 83, 455262, H04B 144

Patent

active

053198000

ABSTRACT:
In a radio transceiver (11) including a voltage controlled oscillator (VCO) (24) having an output for coupling to a switchable load (32, 30), a switch (42) couples a compensating load (44) to the output of the VCO when the switchable load is in an off state. The compensating load has an impedance that compensates for the decoupling of the load impedance from the output of the VCO, thus avoiding frequency pull problems. In a further aspect of the invention a voltage variable capacitor (100) is used as the switch.

REFERENCES:
patent: 3153194 (1964-10-01), Orwin et al.
patent: 4885799 (1989-12-01), Van Horn
patent: 5140223 (1992-08-01), Gesche et al.
patent: 5166857 (1992-11-01), Avanic et al.

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