Low power wide dynamic range RMS-to-DC converter

Details Low power wide dynamic range RMS-to-DC converter Low power wide dynamic range RMS-to-DC converter

2008-03-11

2008-03-11

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Exponential

C327S356000

Reexamination Certificate

active

11493528

ABSTRACT:
An RMS to DC converter squares an a-c input signal to obtain a squared direct current voltage signal. The squared direct current voltage signal is applied to successive stages, each stage amplifying its received signal and detecting the amplified level of the signal within a confined range. The detected levels detected in the successive stages are added to produce an output d-c signal that is variable in linear proportion to logarithmic change in RMS voltage of the input signal. The voltage level of the squared direct current voltage signal can be clamped to a predetermined maximum voltage. To expand the range of detection, the squared direct current voltage signal is attenuated prior to detection in one or more of the stages.

REFERENCES:
patent: 6144244 (2000-11-01), Gilbert
patent: 6172549 (2001-01-01), Gilbert
patent: 6348829 (2002-02-01), Gilbert
patent: 6429720 (2002-08-01), Gilbert
patent: 7106604 (2006-09-01), Nash
patent: 2005/0127986 (2005-06-01), Gilbert
Charles Kitchin and Lew Counts, “RMS-DC Conversion-Theory,” RMS to DC Conversion Application Guide, 2nd Edition, 1986, pp. 1-6 and Table of Contents, Section 1, Analog Devices, Inc.

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