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Full Wave Rectifier

IP.com Disclosure Number: IPCOM000091414D
Original Publication Date: 1968-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Esteban, D: AUTHOR [+2]

Abstract

This circuit is a full-wave rectifier which provides two balanced outputs V1 = -2 Beta absolute value of V and V2 = +2 Beta absolute value of V. This result is obtained by summing, through operational amplifiers A3 and A4, the outputs of stages 1 and 2. Output VB from point B is added to VE, while VC is combined with VF. By using similar networks for both paths leading to any one of the two outputs, the transfer delays are made identical and a balanced system is obtained.

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Full Wave Rectifier

This circuit is a full-wave rectifier which provides two balanced outputs V1 = -2 Beta absolute value of V and V2 = +2 Beta absolute value of V. This result is obtained by summing, through operational amplifiers A3 and A4, the outputs of stages 1 and 2. Output VB from point B is added to VE, while VC is combined with VF. By using similar networks for both paths leading to any one of the two outputs, the transfer delays are made identical and a balanced system is obtained.

Stage 1 includes resistor R', differential amplifier A1, diodes D1 and D2 in feedback loops including also resistors 2R', and load impedances R". This circuit is an operational amplifier. For a positive signal V/+/ applied to the A1 inverting input, D2 is on, while D1 is off. D2 being on causes a short. The circuit acts as a basic operational amplifier with a gain equal to -2R'/R'=-2. Therefore VC =-2V/+/. D1 being off, VB = 0. For a negative input voltage V/-/, D1 is on while D2 is off. According to the symmetry, the relations become in this case VB = -2V/-/ and VC = 0.

Stage 2 has amplifier A2, feedback loops including D3 and D4 and two resistors 2R', and two load resistors R". For an input signal composed of a positive part V/+/ and a negative part V/-/, the respective output voltages at points E and F are VE = V/+/ (4R'+R")/(2R'+R")+V/-/R"/(2R'+R")

VF = V/+/R"/(2R'+R")+V/-/(4R'+R")/(2R'+R").

Stage 3 and 4 are operational amplifiers performing summing functions. Stage 3 in...