Circuit for forming low power levels in a transmitter of a radio

Details Circuit for forming low power levels in a transmitter of a radio Circuit for forming low power levels in a transmitter of a radio

1990-04-20

1993-08-31

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

With feedback of modulated output signal

455115, 330284, H04B 104

Patent

active

052416941

ABSTRACT:
The present invention concerns a circuit for forming low power levels in a transmitter of a radio telephone. By a power amplifier (1) of the transmitter is formed the maximum power level and a plurality of lower power levels. As taught by the invention, very low power levels can be produced by controling the power of the RF signal leaking through the power amplifier (1) when said signal is not amplified by the power amplifier. For controlling the leakage power, a PIN diode attenuator (4) connected before the power amplifier (1) is used.

REFERENCES:
patent: 3732496 (1973-05-01), Boyer
patent: 4309771 (1982-01-01), Wilkens
patent: 4523155 (1985-06-01), Walczak et al.
patent: 4560949 (1985-12-01), Young
patent: 4754231 (1988-06-01), Sawa
patent: 4803440 (1989-02-01), Hotta et al.
patent: 4972439 (1990-11-01), Kuznicki et al.
patent: 4992753 (1991-02-01), Jenson et al.
patent: 4993021 (1991-02-01), Nannicini et al.

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