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Title: Amplifier circuit operable over a wide temperature range

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:
 [1];  [2]
  1. San Pedro, CA
  2. Encino, CA
Publication Date:
OSTI Identifier:
863253
Patent Number(s):
US 4134077
Assignee:
System Development Corporation (Santa Monica, CA)
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/

Citation Formats

Kelly, Ronald D, and Cannon, William L. Amplifier circuit operable over a wide temperature range. United States: N. p., 1979. Web.
Kelly, Ronald D, & Cannon, William L. Amplifier circuit operable over a wide temperature range. United States.
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.
@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 = {},
url = {https://www.osti.gov/biblio/863253}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {1}
}

Patent:

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