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Title: Logarithmic current measurement circuit with improved accuracy and temperature stability and associated method

A logarithmic current measurement circuit for operating upon an input electric signal utilizes a quad, dielectrically isolated, well-matched, monolithic bipolar transistor array. One group of circuit components within the circuit cooperate with two transistors of the array to convert the input signal logarithmically to provide a first output signal which is temperature-dependant, and another group of circuit components cooperate with the other two transistors of the array to provide a second output signal which is temperature-dependant. A divider ratios the first and second output signals to provide a resultant output signal which is independent of temperature. The method of the invention includes the operating steps performed by the measurement circuit.
Inventors:
 [1];  [1]
  1. (Knoxville, TN)
Issue Date:
OSTI Identifier:
869384
Assignee:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN) ORNL
Patent Number(s):
US 5327029
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
Country of Publication:
United States
Language:
English
Subject:
logarithmic; current; measurement; circuit; improved; accuracy; temperature; stability; associated; method; operating; input; electric; signal; utilizes; quad; dielectrically; isolated; well-matched; monolithic; bipolar; transistor; array; components; cooperate; transistors; convert; logarithmically; provide; output; temperature-dependant; divider; ratios; signals; resultant; independent; steps; performed; temperature stability; associated method; current measurement; circuit component; measurement circuit; electric signal; electrically isolated; output signals; output signal; input signal; circuit components; electrically isolate; improved accuracy; bipolar transistor; logarithmic current; /327/