Regulated output current source for cordless telephones

Details Regulated output current source for cordless telephones Regulated output current source for cordless telephones

1985-03-07

1985-12-10

Rubinson, Gene Z.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

179 2E, 455 89, 455117, 455126, H04Q 704

Patent

active

045581770

ABSTRACT:
A circuit for providing a constant current to an output stage of a cordless telephone transmitter using AC power lines as a transmission medium to maintain the RF component on the AC lines to within regulated limits. The RF component is sensed to provide a control signal to a voltage-responsive capacitor in a tuned circuit connected to a tuned coupling transformer between a modulating circuit and the transmitter output amplifier. When the RF component exceeds the current limit of 90 mA, the coupling transformer is detuned to maintain the RF current in the power lines to within the regulated limits.

REFERENCES:
patent: 2085125 (1937-06-01), Shaw
patent: 2581983 (1952-01-01), Thompson
patent: 2896073 (1959-07-01), Westphal
patent: 3493867 (1970-02-01), Arase
patent: 3955144 (1976-05-01), Dishal
patent: 4044308 (1977-08-01), Stites et al.
patent: 4114108 (1978-12-01), Faulkenberry et al.
patent: 4147985 (1979-04-01), Rogers

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