A simple wide-band CMOS based true rms-to-dc converter

A simple integrable circuit technique for the realization of a wide bandwidth current-mode CMOS true rms-to-dc converter is proposed. The realization scheme is based on the implicit computation method that makes use of the characteristic of a CMOS squaring circuit, where the transistors are biased in their saturation regions. The conversion circuit consumes very low power due to the bias current of the circuit provided by the root-mean-square current I RMS. The performance of the proposed circuit is studied through PSPICE simulation and experimental results.

[1]  Harry L. Helms.  Linear IC devices : 1987 source book , 1987 .

[2]  Z. Wang.  Analytical determination of output resistance and DC matching errors in MOS current mirrors , 1990 .

[3]  K. Bult,et al.  A class of analog CMOS circuits based on the square-law characteristic of an MOS transistor in saturation , 1987 .

[4]  Eric A. Vittoz,et al.  CMOS selfbiased Euclidean distance computing circuit with high dynamic range , 1992 .

[5]  A.H.M. van Roermund,et al.  An RMS-DC converter based on the dynamical translinear principle , 1996, ESSCIRC '96: Proceedings of the 22nd European Solid-State Circuits Conference.

[6]  A. Carlosena,et al.  A current-mode CMOS RMS-DC converter for very low-voltage applications , 2001, ICECS 2001. 8th IEEE International Conference on Electronics, Circuits and Systems (Cat. No.01EX483).

[7]  Chee Yee Kwok,et al.  A novel multi-input floating-gate MOS four-quadrant analog multiplier , 1996, IEEE J. Solid State Circuits.

[8]  Wanlop Surakampontorn,et al.  A dual translinear-based true RMS-to-DC converter , 1998, IEEE Trans. Instrum. Meas..

[9]  Z. Wang.  Novel pseudo RMS current converter for sinusoidal signals using a CMOS precision current rectifier , 1990 .

[10]  R. F. Wassenaar,et al.  New techniques for high-frequency RMS-to-DC conversion based on a multifunctional V-to-I convertor , 1988 .

[11]  S. Pookaiyaudom,et al.  Electronically tunable filter blocks , 1979 .

[12]  A. J. Peyton,et al.  Analog Electronics with Op-amps: A Source Book of Practical Circuits , 1993 .

[13]  Wouter A. Serdijn,et al.  Dynamic translinear RMS-DC converter , 1996 .

[14]  R.F. Wassenaar,et al.  A wide-band technique for vector summation and RMS-DC conversion , 1984, IEEE Journal of Solid-State Circuits.

[15]  J. K. Kolanko,et al.  Accurate measurement of power, energy, and true RMS voltage using synchronous counting , 1993 .

[16]  Andrei Vladimirescu,et al.  The Simulation of MOS Integrated Circuits Using SPICE2 , 1980 .