Telecommunications – Transmitter – With feedback of modulated output signal
Patent
1994-05-20
1995-11-28
Urban, Edward F.
Telecommunications
Transmitter
With feedback of modulated output signal
4552401, 455127, 455 34, 4552341, 330259, 330256, H04B 400
Patent
active
054716543
ABSTRACT:
A transmitting/receiving unit capable of setting the level of power for transmitting an output frequency signal, which correctly correspond to the level of a received frequency signal, without dependency upon change in the environmental temperature, the transmitting/receiving unit including a signal transmitting portion; and a signal receiving portion so as to be capable of generating an output signal, the level of which depends upon the level of a received signal, wherein the signal transmitting portion includes first variable-gain amplifying means having an amplified gain which is varied by first AGC voltage, the signal receiving portion includes second variable-gain amplifying means having an amplified gain which is varied by second AGC voltage, wave-detection means for generating DC voltage which is in proportion to level of an output signal from the second variable-gain amplifying means, and temperature-dependent-type automatic gain control voltage generating means for converting the DC voltage into AGC voltage which depends upon change in environmental temperature, wherein the AGC voltages are used to compensate temperature change of the gain so that the level of the output signal is made to be constant to correspond to the level of the received signal regardless of change in the environmental temperature.
REFERENCES:
patent: 4870698 (1989-09-01), Katsuyama et al.
patent: 5081708 (1992-01-01), Sacchi et al.
patent: 5107225 (1992-04-01), Wheatley, III et al.
Aoki Kazuharu
Okazaki Mitsunari
Alps Electric Co. ,Ltd.
Bever Patrick T.
Shoup Guy W.
To Doris
Urban Edward F.
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