Telecommunications – Transmitter – Power control – power supply – or bias voltage supply
Patent
1991-11-25
1994-01-11
Eisenzopf, Reinhard J.
Telecommunications
Transmitter
Power control, power supply, or bias voltage supply
455 89, H04B 138, H04B 1034
Patent
active
052789969
ABSTRACT:
A portable radio transceiver wherein an isolator which impedance varies usually with the frequency of a communication signal is connected to a power amplifier for power amplification of the communication signal as its load so that, when the frequency of the communication signal is changed through selection of the communication channel, the load impedance of the power amplifier is also changed and correspondingly the consumption current of the power amplifier is changed. In the portable radio transceiver, in order to suppress the change of the consumption current of the power amplifier, an impedance compensation circuit which impedance varies in its direction opposed to the isolator depending on the frequency of the communication signal is separately connected to the power amplifier, whereby changes in the impedance of the load side when viewed from the power amplifier can be substantially cancelled each other.
REFERENCES:
patent: 3766330 (1973-10-01), Hepp et al.
patent: 4370622 (1983-01-01), Hornbeck et al.
patent: 4612669 (1986-09-01), Nossen
patent: 5095285 (1992-03-01), Khatibzadeh
Eisenzopf Reinhard J.
Kabushiki Kaisha Toshiba
Vo Nguyen
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