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A double phase-sensitive detector for bridge balancing

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1 Author(s)
Diamond, Joseph M. ; Danish Atomic Energy Commission

The general considerations involved in the design of low-frequency phase-sensitive detectors are reviewed. These include the equivalence of multiplier- and gating-type detectors, of pre- and postdetection filtering with regard to both signal and noise, and of half- and full-wave detection. The various configurations of full-wave chopper circuits using similar or complementary bipolar transistors are compared from the point of view of offsets. A question that has not been previously discussed¿the degree of prefiltering needed to avoid noise saturation¿is analyzed. These principles are applied to the design of a fixed-frequency detector that is especially adapted to bridge-balancing applications.

Published in:

Spectrum, IEEE  (Volume:6 ,  Issue: 6 )

Date of Publication:

June 1969

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