Amplifier circuit operable over a wide temperature range

Details Amplifier circuit operable over a wide temperature range Amplifier circuit operable over a wide temperature range

1977-10-20

1979-01-09

Mullins, James B.

Amplifiers

Sum and difference amplifiers

330 65, H03F 345

Patent

active

041340779

ABSTRACT:
An amplifier circuit having stable performance characteristics over a wide temperature range from approximately 0.degree. C up to as high as approximately 500.degree. C, such as might be encountered in a geothermal borehole. The amplifier utilizes ceramic vacuum tubes connected in directly coupled differential amplifier pairs having a common power supply and a cathode follower output stage. In an alternate embodiment, for operation up to 500.degree. C, positive and negative power supplies are utilized to provide improved gain characteristics, and all electrical connections are made by welding. Resistor elements in this version of the invention are specially heat treated to improve their stability with temperature.

REFERENCES:
patent: 2796468 (1957-06-01), McDonald
patent: 2887605 (1959-05-01), Karabats
patent: 2930982 (1960-03-01), Patterson
patent: 3299309 (1967-01-01), Claypool
Kidokoro et al., "DC Amplifier Using Electrochemical Device," Electronics and Communications in Japan vol. 55-C, No. 10, Oct. 1972, pp. 115-121.

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