Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1989-04-19
1991-06-25
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 715, 324158D, G01R 3126
Patent
active
050270648
ABSTRACT:
The operating temperature of the active region of an RF semiconductor device such as a microwave hybrid circuit having a gallium arsenide field-effect transistor therein is determined by measuring signal gain of the device at variable times following application of bias voltage to the device. Bias voltage is applied in response to a constant duty cycle pulse train from which are derived a sample-and-hold command pulse and a synchronized bias control pulse.
REFERENCES:
patent: 3659199 (1972-04-01), Knutson
patent: 3870953 (1975-03-01), Boatman
patent: 3895297 (1975-07-01), Jarl
patent: 3904962 (1975-09-01), Olson, Jr.
patent: 4114096 (1978-09-01), Chinery
patent: 4588945 (1986-05-01), Groves et al.
Celeritek Inc.
Karlsen Ernest F.
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