Amplifiers – With amplifier bypass means
Patent
1995-01-30
1996-04-16
Mottola, Steven
Amplifiers
With amplifier bypass means
330 52, 330149, H03F 366, H03F 126
Patent
active
055086578
ABSTRACT:
A feed forward cancellation amplifier system for amplifying radio frequency telephony signals, including a main amplifier, an error correction circuit producing a message error signal, an error amplifier for producing an amplified message error signal that is then subtracted from the amplified and distorted message signal output of the main amplifier prior to a final output circuit, a negative feedback circuit responsive to a test signal for compensating and minimizing variation or drift in the operation of the error amplifier, the error correction circuit including a vector modulator responsive to modified quadrature vector components of the message error signal for producing a single voltage vector error signal, and the negative feedback circuit including an I & Q network for modifying the quadrature vector components of the error signal in the error correction circuit.
The preferred form of the invention utilizes PIN diodes to provide voltage controlled attenuators in the vector modulator.
An auxiliary negative feedback circuit is also provided for compensating variation or drift of the main amplifier.
REFERENCES:
patent: 3922617 (1975-11-01), Denniston et al.
patent: 5323119 (1994-06-01), Powell et al.
patent: 5396189 (1995-03-01), Hays
1992 Merrimac Catalogue, West Caldwell, New Jersey Sections 2.1 to 2.4, entitled: "Complex Modulators and Demodulators (I & Q Networks) 10 to 8,000 MHz".
AML Communications, Inc.
Arant Gene W.
Mottola Steven
LandOfFree
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