Amplifiers – With amplifier condition indicating or testing means
Patent
1982-03-15
1984-11-06
Mullins, James B.
Amplifiers
With amplifier condition indicating or testing means
330207R, 330278, G01R 1900
Patent
active
044814771
ABSTRACT:
A method and apparatus for measuring the small signal gain of an amplifier. Each amplifier responds, in operation, to a small signal input. The small signal input varies substantially linearly over a field time interval. A small bias signal is added to the bias level input of the amplifier during a portion of the field time interval. The output of the amplifier is measured at three or more different times during the field time interval, at least one time when the small bias signal has not been added to the bias level input and at least one time being when the small bias signal has been added to the bias level input. By processing the measured outputs, a signal which is directly proportional to the product of the small bias signal with the small signal gain of the amplifier is obtained. A method and apparatus for actively compensating for differences in the small signal gain among two or more amplifiers is obtained by dividing the small signal output of each amplifier by the signal proportional to the small signal gain of the amplifier.
REFERENCES:
patent: 4109213 (1978-08-01), Holley et al.
Mullins James B.
North American Philips Corporation
Schechter Marc D.
Wan G.
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