Log amplifier with pole-zero compensation

Patent · 01 January 1987

OSTI ID:866105

Brookshier, William ^[1]

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1. Downers Grove, IL

A logarithmic amplifier circuit provides pole-zero compensation for improved stability and response time over 6-8 decades of input signal frequency. The amplifier circuit includes a first operational amplifier with a first feedback loop which includes a second, inverting operational amplifier in a second feedback loop. The compensated output signal is provided by the second operational amplifier with the log elements, i.e., resistors, and the compensating capacitors in each of the feedback loops having equal values so that each break point or pole is offset by a compensating break point or zero.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4634986
• OSTI ID: 866105
• Country of Publication: United States
• Language: English

Related Subjects

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6-8
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feedback
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loop
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pole
pole-zero
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provided
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resistors
response
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signal
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stability
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zero