Telecommunications – Carrier wave repeater or relay system – Portable or mobile repeater
Patent
1993-08-26
1995-04-25
Eisenzopf, Reinhard J.
Telecommunications
Carrier wave repeater or relay system
Portable or mobile repeater
455103, 455116, 455126, 330254, 330278, 330284, H04B 104
Patent
active
054107296
ABSTRACT:
A signal transmission device having ALC function includes a detection circuit for output level detection when used in a multi-carrier :system where the number of carriers changes. The signal transmission device further has a variable attenuator for controlling a level of a transmission signal. A transmission circuit is coupled to the output of the variable attenuator for modulating a local oscillation signal with the output of the variable attenuator and for generating a modulated output signal. The detection circuit is provided with the modulated output signal for generating a detection voltage. The detection circuit includes a diode having a square-law characteristic region. A reference voltage generating circuit receives an information signal indicative of the number of carriers for generating a reference voltage corresponding to the number of carriers. A first control circuit is provided, receiving the detecting voltage and the reference voltage, for generating and supplying, to the variable attenuator, a first control signal of a difference between the detection voltage and the reference voltage. A second control circuit is supplied with the information signal indicative of the number of carriers, for generating and supplying, to the detection circuit, a second control signal corresponding to the number of carriers, whereby the square-law characteristic region of the diode in the detection circuit is shifted responding to the second control signal.
REFERENCES:
patent: 4574252 (1986-03-01), Slack
patent: 4991164 (1991-02-01), Casiraghi et al.
patent: 4992753 (1991-02-01), Jenson et al.
patent: 5287555 (1994-02-01), Wilson et al.
Endo Yoichi
Kumagai Yoshiaki
Eisenzopf Reinhard J.
Faile Andrew
Fujitsu Limited
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