Radio frequency power amplifier having variable output power

Details Radio frequency power amplifier having variable output power Radio frequency power amplifier having variable output power

1993-04-01

1994-01-04

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

455107, 455116, 455127, 455129, 330 86, 330284, H04B 138

Patent

active

052769127

ABSTRACT:
A radio-frequency amplifier (50) has an impedance transformation network (66) with a control input (70) for controlling the transformation characteristic of the transformation network (66). The radio-frequency amplifier (50) amplifies an input signal to produce an amplified radio-frequency output signal to a load (68). The control circuit selects a power level for the output signal, in response to a control signal, by transforming the impedance of the load to a transformed impedance at the output of the radio-frequency amplifier, so that the efficiency of the radio-frequency amplifier is not substantially degraded as the power level for the output signal is changed.

REFERENCES:
patent: 3151295 (1964-09-01), Haviland
patent: 3708756 (1973-01-01), Fajen
patent: 4165493 (1979-08-01), Harrington
patent: 4196394 (1980-04-01), Adams
patent: 4311972 (1982-01-01), Landt et al.
patent: 4320350 (1982-03-01), Drapac
patent: 4439744 (1984-03-01), Kumar et al.
patent: 4490734 (1984-12-01), Yamada
patent: 4613990 (1986-09-01), Halpern
patent: 4673886 (1987-06-01), Bickley et al.
patent: 4707620 (1987-11-01), Sullivan et al.
patent: 4935705 (1990-06-01), Estanislao et al.
patent: 4994757 (1991-02-01), Bickley et al.
Motorola Service Manual 68P81016C45-A, "MX300 Series, Handie-Talkie'FM Marine Radio", (1981) discloses a radio with a power amplifier having a stage of amplification that may be manually bypassed (i.e., with a toggle switch). See p. 6, Switch S303.

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