MTL‐based implementation of current‐mode CMOS RMS‐to‐DC converters

Abstract

In this paper, systematic implementation of current-mode RMS-to-DC converters based upon MOS translinear (MTL) principle, utilizing symmetric cascoded MTL cell (SCMC) is proposed. Theory of operation and mathematical analysis of both explicit (direct) and implicit (indirect) techniques for realization of SCMC-based RMS-to-DC converters are discussed. The SCMC includes a folded MTL loop and realizes an MTL equation. MTL principle utilizes the square law characteristics of saturated MOS transistors to realize square-root domain (SRD) functions. The SCMC is constructed by two connected cascoded current mirrors and has a compact, symmetric, and multi-purpose structure, with capability of implementing the circuits into the programmable and configurable structures. The proposed RMS-to-DC converters utilize the SCMC along with a configurable current mirror array. The required squaring and square-rooting functions are realized using the SCMC, after proper configuration of the current mirror array. The proposed circuits have been implemented using a reconfigurable architecture fabricated in a 0.5 μm CMOS technology.

A 1.2-V Current-Mode RMS-to-DC Converter Based on a Novel Two-Quadrant Electronically Simulated MOS Translinear Loop

“…6 (b) shows and its relative error, as defined in (15), for different duty cycles of the input signal. The output current is approximately proportional to the square root of the duty cycle as expected [7] with errors lower than ±5 %. These variations are mainly due to saturation of output current for small duty cycles and inaccuracy of the square/divider cell for large duty cycles.…”

“…There are several current-mode solutions reported in the literature that perform a RMS-to-DC conversion [1][2][3][4][5][6][7][8][9][10][11][12][13]. Among them, it is worth mentioning those based on the dynamic translinear (TL) principle using BJT transistors [4].…”

“…To overcome these shortcomings, RMS-to-DC converters with MOS transistors operating in strong inversion have been proposed using the generalized MOS TL (MTL) principle [15]. In such implementations, a two-quadrant Squarer/Divider (S/D) cell is preferred to avoid a full-wave rectifier at their inputs, thereby up-down MTL loops [6][7][8]16] or multi-coupled MTL loops using class-AB transconductors [9] have been proposed.…”

New current‐mode RMS‐to‐DC converters and four‐quadrant multiplier/divider based on VDTA

“…Assuming that the second VDTA in Fig. 1a -the first-order current-mode LPF, is used as an averaging circuit in the implementation of RMS-to-DC converter in the proposed configuration [7], we can write and…”

A New High Precision Power Detector of Complex Voltage Signals

“…The frequency responses, dynamic range of this bipolar detector, were all comparable and even superior to most diode detectors. The error in computing the effective value of the processed input voltage signal was lower than in all realizations used for comparisons, whereby the circuit of the proposed detector, which includes a wider dynamic range, is more facilitating for the realization compared to those described in [15,[24][25][26]32]. Similarly, it does not require a specific compensation procedure as [27].…”