Control of attenuation and amplification in foward and feedback

Details Control of attenuation and amplification in foward and feedback Control of attenuation and amplification in foward and feedback

1994-08-31

1996-04-09

Pham, Chi H.

Telecommunications

Transmitter

With feedback of modulated output signal

455127, 330 85, 330291, H04B 104

Patent

active

055070175

ABSTRACT:
A Cartesian amplifier is provided with a means of controlling its output power comprising a controllable attenuator in the amplifier forward path and a controllable amplifier in the feedback path. A control signal representing the required power level is applied to the attenuator and controllable amplifier and, in response thereto, the degrees of attenuation and amplification are varied in inverse proportion to one another.

REFERENCES:
patent: 5066922 (1991-11-01), Leitch
patent: 5066923 (1991-11-01), Gailus et al.
patent: 5128629 (1992-07-01), Trinh
patent: 5208550 (1993-05-01), Iwane
patent: 5212814 (1993-05-01), Iwane
patent: 5214393 (1993-05-01), Aihara
Patent Abstracts of Japan, vol. 17, No. 583 (E-1452) 13 Jul. 1993 & JP-A-05 175 771 (Fujitsu).
British Search Report dated 27 Oct. 1994 (3 pages).

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