Precision Full-wave Rectifiers Research Articles

Full-Phase Operation Transresistance-Mode Precision Full-Wave Rectifier Designs Using Single Operational Transresistance Amplifier

This study proposed the designs of two full-phase operation transresistance-mode (TRM) precision full-wave rectifiers. The first circuit consisted of a single operational transresistance amplifier (OTRA), four diodes, and a resistor. The second scheme was an OTRA combined with a full metal-oxide semiconductor field-effect transistor-based design, which is preferable for integrated circuit implementation because no passive components are used in the circuit topology. Based on our literature review, this is the first study that discussed a full-phase operation transresistance-mode precision full-wave rectifier consisting of a single OTRA and few passive components. In this paper, several previously reported precision full-wave rectifiers consisting of various active devices are first reviewed followed by the proposed OTRA-based transresistance-mode precision full-wave rectifiers and an analysis of nonideal effects. Furthermore, computer simulations and experimental results are presented to verify the validity of the proposed circuits, which were consistent with the theoretical predictions.

Precision Full-Wave Rectifiers with Current Active Elements and Current Biasing

This article discusses universal precision rectifiers using current active elements and current sources for the diode excitation. The paper introduces circuit solution of the universal precision full-wave rectifier with intention to reduce negative effect of diode reverse recovery time. Furthermore, experimental results are given and a comparison of new circuit of precision full-wave rectifier and its known variant is presented.

Wide bandwidth Pythagorean rectifier

It has recently been proposed by a few authors that the trigonometric Pythagorean identity can be used for the implementation of precision full-wave rectifiers for sinusoidal signals with advantages with respect to diode-based rectifiers for amplitudes in the hundreds of mV range. The approaches proposed so far require a 90° phase shifter and this results in the obvious limitation that the input signal frequency must be known prior to amplitude measurement. In this study, the authors propose a new precision full-wave rectifier, capable of overcoming this limitation. Starting from the sinusoidal input, a squared co-sinusoidal signal is obtained in a wide frequency range by multiplying the output signals of an integrator and of a differentiator. The signal thus obtained is added to the input signal squared, and a square root extractor is employed for obtaining a DC signal proportional to the amplitude of the input signal. A prototype capable of operating within a two decades frequency range across 3200 Hz has been realised and tested with an accuracy better than 2% and a residual ripple of less than 0.3% for input amplitudes larger than 100 mV. A configuration capable of operating in the MHz frequency range is also proposed.

SYNTHESIS OF CURRENT DIFFERENCING TRANSCONDUCTANCE AMPLIFIER-BASED CURRENT LIMITERS AND ITS APPLICATIONS

A synthesis of analog current limiter (CL) building blocks based on a current differencing transconductance amplifier (CDTA) is proposed. The breakpoint and the slope of the resulting transfer characteristic obtained from the proposed CDTA-based CL are electronically programmable through the external bias currents. To demonstrate versatility of the proposed electronically tunable CLs, some nonlinear applications to programmable current-mode precision full-wave rectifiers and piecewise-linear function approximation generators are also presented. PSPICE simulation and experimental results confirm the effectiveness of the proposed circuits.

Versatile Precision Full-Wave Rectifiers for Instrumentation and Measurements

This paper analyzes the performance of a family of high-quality precision full-wave rectifiers that utilize operational conveyors. The circuits have high precision, wide bandwidth, and high accuracy and are superior to the corresponding operational-amplifier (op amp)-based circuits. Using the LF351 op amp, they are able to rectify signals up to 100 kHz and beyond with little or no distortion. PSPICE results for the circuits are presented.