Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1988-12-29
1990-06-26
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including gain control means
330 2, H03F 330
Patent
active
049375350
ABSTRACT:
A method for calibrating measurement or analysis systems that is externally traceable, simple, and repeatable, which is particularly amenable to computer control, and a unique programmable phase-gain amplifier which is especially suited for use in the calibration method, are disclosed. Alternatively, a programmable sample clock delay technique is disclosed to provide phase calibration. The method employs an externally traceable digital voltmeter to measure the magnitude of the signal being applied to an input channel of the measurement system; and obtains a digital representation of the output of the channel. When the input magnitude does not match the output magnitude, the programmable phase-gain amplifier gain is adjusted. These adjustments are made for each range of each channel. Thereafter, the relative phase shifts between channels is determined and the gain of a variable gain amplifier in the programmable phase-gain amplifier for each channel is changed to adjust the phase shift through each channel to the desired amount.
REFERENCES:
patent: 4115741 (1978-09-01), Skutta
patent: 4225976 (1980-09-01), Osborne et al.
patent: 4260953 (1981-04-01), Touzard et al.
patent: 4683542 (1987-07-01), Taniguti
McHargue Patrick L.
Underwood Marcos A.
GenRad Inc.
Mottola Steven
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