Logarithmic current measurement circuit with improved accuracy and temperature stability and associated method
Abstract
A logarithmic current measurement circuit for operating upon an input electric signal utilizes a quad, dielectrically isolated, wellmatched, 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 temperaturedependant, and another group of circuit components cooperate with the other two transistors of the array to provide a second output signal which is temperaturedependant. 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:

 Knoxville, TN
 Issue Date:
 Research Org.:
 Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
 OSTI Identifier:
 869384
 Patent Number(s):
 5327029
 Assignee:
 Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
 Resource Type:
 Patent
 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; wellmatched; monolithic; bipolar; transistor; array; components; cooperate; transistors; convert; logarithmically; provide; output; temperaturedependant; 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/
Citation Formats
Ericson, M Nance, and Rochelle, James M. Logarithmic current measurement circuit with improved accuracy and temperature stability and associated method. United States: N. p., 1994.
Web.
Ericson, M Nance, & Rochelle, James M. Logarithmic current measurement circuit with improved accuracy and temperature stability and associated method. United States.
Ericson, M Nance, and Rochelle, James M. Sat .
"Logarithmic current measurement circuit with improved accuracy and temperature stability and associated method". United States. https://www.osti.gov/servlets/purl/869384.
@article{osti_869384,
title = {Logarithmic current measurement circuit with improved accuracy and temperature stability and associated method},
author = {Ericson, M Nance and Rochelle, James M},
abstractNote = {A logarithmic current measurement circuit for operating upon an input electric signal utilizes a quad, dielectrically isolated, wellmatched, 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 temperaturedependant, and another group of circuit components cooperate with the other two transistors of the array to provide a second output signal which is temperaturedependant. 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {1}
}