Pulse or digital communications – Repeaters – Testing
Patent
1993-06-04
1995-01-17
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
455115, 455126, 455127, 330279, H03G 330, H04B 102
Patent
active
053832230
ABSTRACT:
In a level detector (17), a bias voltage is developed by a bias current to have a substantially constant difference irrespective of a temperature variation from a detected voltage produced by detecting a device output signal for use in TDM modulation. A control signal generator (19) calculates a substantially temperature independent difference digital value by subtracting a second digital value of the bias voltage from a first digital value of the detected voltage to produce an attenuation control analog level used in controlling a variable attenuator (11) which deals with a device input signal to produce an attenuator output signal with a desired value for use as the device output signal. Preferably, the detected and the bias voltages are amplified by a variable gain amplifier (35) controlled by a processor output signal.
REFERENCES:
patent: 4553104 (1985-11-01), Olsen
patent: 4602218 (1986-07-01), Vilmur et al.
patent: 5081713 (1992-01-01), Miyazaki
patent: 5101176 (1992-03-01), Norimatsu
patent: 5113525 (1992-05-01), Andor
patent: 5196806 (1993-03-01), Ichihara
patent: 5287555 (1994-02-01), Wilson et al.
Patent Abstracts of Japan, vol. 16, No. 447 (E-1266) Sep. 17, 1992 & JP-A-41 57 927 (NEC Corp.).
Chin Stephen
Japan Radio Co. Ltd.
Tse Young
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