Explicit log domain root-mean-square detector

Details Explicit log domain root-mean-square detector Explicit log domain root-mean-square detector

1995-06-06

1996-12-17

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Exponential

327350, G06G 720, G06G 724

Patent

active

055857574

ABSTRACT:
An explicit RMS detector sequentially performs the square, mean and square-root operations in the log domain. An input signal is first applied to a log converter, and then to a times two multiplier which squares the input signal. A log filter averages the log square input signal for a predetermined period to approximate the "mean" operation, after which a times one-half multiplier operates on the log mean-square input signal to compute the square root. An exponentiator exponentiates the resulting log root-mean-square input signal to produce an output signal that approximates the RMS value of the input signal for the predetermined period.

REFERENCES:
patent: 3214603 (1965-10-01), Von Urff, Jr.
patent: 3423578 (1969-01-01), Platzer, Jr. et al.
patent: 3657528 (1972-04-01), Plante
patent: 4430626 (1984-02-01), Adams
patent: 5252864 (1993-10-01), Kooijman
That 2252 ICRMS-Level Detector Data Sheet, That Corporation, Sep. 1993, pp. 1-10 no month.
D. Sheingold, "Nonlinear Circuits Handbook", Analog Devices, Inc., pp. 398-403, 1976 no month.
National Semiconductor LH0091 True RMS to DC Converter Chip, 1988 no month.
Douglas Frey, "Log Domain Filtering: An Approach to Current Mode Filtering", IEEE Proceedings, Pt. G, vol. 140, No. 6, pp. 406-416, Dec. 1993.

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