Telecommunications – Transmitter – Carrier amplitude control
Patent
1996-10-30
1999-06-22
Urban, Edward F.
Telecommunications
Transmitter
Carrier amplitude control
455126, 375297, H04B 104
Patent
active
059152133
ABSTRACT:
Simple and low-cost linearizing circuit for compensating for amplitude and phase distortion produced in a power amplification stage of a radio transmitter apparatus that is required to have a high linearity. Amplitude distortion compensation means, disposed in an intermediate frequency amplifier, has a field-effect transistor whose gate bias voltage is set near to its pinchoff voltage and compensates for amplitude distortion produced in a radio frequency amplifier. On the other hand, phase distortion compensation means having a varactor diode and a branch-line hybrid is disposed in the radio frequency amplifier so as to compensate for phase distortion produced in the radio frequency amplifier. The phase distortion compensation means can be disposed in a local frequency oscillation circuit, alternatively.
REFERENCES:
patent: 5170495 (1992-12-01), McNicol et al.
patent: 5175879 (1992-12-01), Ellingson et al.
patent: 5251330 (1993-10-01), Chiba et al.
patent: 5420536 (1995-05-01), Faulkner et al.
patent: 5471654 (1995-11-01), Okazaki et al.
patent: 5483681 (1996-01-01), Bergsten et al.
patent: 5532646 (1996-07-01), Aihara
Hayasaka Kouichi
Iwatsuki Masanori
Sato Shouichi
Shibuya Yasuhiro
Fujitsu Limited
Urban Edward F.
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