Telecommunications – Transmitter – Power control – power supply – or bias voltage supply
Patent
1990-07-02
1992-03-10
Kuntz, Curtis
Telecommunications
Transmitter
Power control, power supply, or bias voltage supply
455 89, 455343, H04B 104
Patent
active
050955420
ABSTRACT:
An apparatus for controlling a transmission output level for a burst signal which is used in a communication of the TDMA system in which a transmission output level can be arbitrarily set. The apparatus comprises a variable gain amplifier whose gain can be varied by a control voltage which is inputted to a control terminal; a variable gain amplifier whose gain can be varied by a control voltage which is inputted to a control terminal; a detecting circuit in which the variable gain amplifiers and are cascade connected to an input terminal to which a signal of a predetermined amplitude is inputted and to which an output electric power of the amplifier at the post stage is inputted and which extracts and detects a part of a voltage which is proportional to the output electric power; an attenuator which receives the voltage detected by the detecting circuit and can output at an arbitrary attenuation ratio; a reference waveform generating apparatus for outputting an envelope for a burst signal; a comparison amplifier which amplifies a different voltage between an output voltage of the attenuator and an output voltage of the reference waveform generating apparatus and whose output is connected to the control terminal of the variable gain amplifier; a control unit for controlling the control voltage of the variable gain amplifier and the attenuation ratio of the attenuator; and an output terminal for outputting a burst waveform from the detecting circuit.
REFERENCES:
patent: 4731866 (1988-03-01), Muratani et al.
patent: 4856082 (1989-08-01), Kasa
patent: 4994757 (1991-02-01), Bickley et al.
Horiike Yoshio
Kosugi Hiroaki
Suematsu Takayuki
Kuntz Curtis
Matsushita Electric - Industrial Co., Ltd.
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