Amplifiers – With amplifier condition indicating or testing means
Patent
1986-10-31
1988-12-27
Mullins, James B.
Amplifiers
With amplifier condition indicating or testing means
330 52, 330124R, 330129, 330279, 330295, H03F 368, H03G 300
Patent
active
047943432
ABSTRACT:
A plurality of amplifier channels, wherein each channel is automatically gain controlled by a gain control signal and wherein the gain of each channel is a known function of a plurality of constants of corresponding to each amplifier and of the gain control signal, can be calibrated by the following method. The method comprising the steps of measuring each output of each amplifier at a corresponding plurality of gain control values and at a corresponding input to each amplifier. The number of the plurality of the constants equals the number of the plurality of the gain control values. The method continues by computing the gain of each amplifier at the step of measuring. The constants corresponding to each amplifier are then computed according to the function and computed gain. A corresponding changed gain control signal is applied to each amplifier according to the function to set the corresponding gain of each amplifier to a corresponding predetermined calibrated value. By virtue of this methodology, the gain of each channel of a multiple channel amplifier can be not only calibrated to equal a preset value, but the gains of each of the channels can be matched, all without the use of any other additional test equipment.
REFERENCES:
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patent: 3119077 (1964-01-01), Saari
patent: 3942181 (1976-03-01), Berrod et al.
patent: 4219780 (1980-08-01), Roulston et al.
patent: 4335384 (1982-06-01), Roos
patent: 4481477 (1984-11-01), Wittig
Hays R. A.
Hughes Aircraft Company
Karambelas A. W.
Mullins James B.
Sales M. W.
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