Amplifier circuit operable over a wide temperature range

Kelly, Ronald D; Cannon, William L

Title: Amplifier circuit operable over a wide temperature range

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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.

Inventors:

Kelly, Ronald D ^[1]; Cannon, William L ^[2]

San Pedro, CA
Encino, CA

Issue Date:: 1979-01-01

OSTI Identifier:: 863253

Patent Number(s):: 4134077

Assignee:: System Development Corporation (Santa Monica, CA)

Patent Classifications (CPCs):: H - ELECTRICITY H03 - BASIC ELECTRONIC CIRCUITRY H03F - AMPLIFIERS

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H - ELECTRICITY H03 - BASIC ELECTRONIC CIRCUITRY H03F - AMPLIFIERS
H03F3/45 - Differential amplifiers

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DOE Contract Number:: E(04-3)-1330

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: amplifier; circuit; operable; wide; temperature; range; stable; performance; characteristics; approximately; degree; 500; encountered; geothermal; borehole; utilizes; ceramic; vacuum; tubes; connected; directly; coupled; differential; pairs; common; power; supply; cathode; follower; output; stage; alternate; embodiment; operation; positive; negative; supplies; utilized; provide; improved; electrical; connections; welding; resistor; elements; version; specially; heat; treated; improve; stability; performance characteristics; resistor element; provide improved; differential amplifier; temperature range; power supply; heat treated; alternate embodiment; electrical connection; amplifier circuit; wide temperature; power supplies; output stage; directly coupled; tubes connected; vacuum tube; vacuum tubes; electrical connections; ceramic vacuum; performance characteristic; geothermal borehole; tubes connect; provide improve; /330/

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                    Kelly, Ronald D, and Cannon, William L. Amplifier circuit operable over a wide temperature range.  United States: N. p., 1979. 
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                    Kelly, Ronald D, & Cannon, William L. Amplifier circuit operable over a wide temperature range.  United States.

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                    Kelly, Ronald D, and Cannon, William L. Mon .  
        "Amplifier circuit operable over a wide temperature range".  United States.  https://www.osti.gov/servlets/purl/863253.

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@article{osti_863253,

  title        = {Amplifier circuit operable over a wide temperature range},

  author       = {Kelly, Ronald D and Cannon, William L},

  abstractNote = {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.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1979},

  month        = {1}

}

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