Root-mean-square converter method and circuit

Details Root-mean-square converter method and circuit Root-mean-square converter method and circuit

1997-12-01

1999-04-20

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Exponential

327347, G06F 7556

Patent

active

058960562

ABSTRACT:
A sampled data, analog computing method and circuit for producing an output voltage V.sub.OUT with a magnitude proportional to the root-mean-square value V.sub.RMS of a monopolar input voltage V.sub.DC, first demodulates or chops a time-varying monopolar input voltage V.sub.DC of interest to produce a demodulated or chopped voltage V.sub.CHOP, and then filters the chopped voltage V.sub.CHOP to produce an output voltage V.sub.OUT. The chopping operation is conducted at a duty ratio or modulation ratio proportional to the ratio of the monopolar input voltage V.sub.DC to the output voltage V.sub.OUT, with the result that the magnitude of the output voltage V.sub.OUT is proportional to the root-mean-square value V.sub.RMS of the monopolar input voltage V.sub.DC. The illustrated embodiment of the invention (i) rectifies a time-varying bipolar input voltage V.sub.AC of interest with a precision fullwave rectifier to produce the monopolar input voltage V.sub.DC, (ii) produces a pulse code modulated (PCM) signal with the required duty ratio utilizing an oversampling delta-sigma modulator, and (iii) produces the output voltage V.sub.OUT with an inverting second order low pass filter so that V.sub.OUT has the inverted polarity and greater magnitude compared to V.sub.DC that is required on the delta-sigma modulator reference node.

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