Title :
Unity-gain frequency-independent quadrature phase shifter
Author :
Tay, E.W. ; Murti, V.G.K.
Author_Institution :
National University of Singapore, Department of Electrical Engineering, Singapore
Abstract :
An active circuit which simultaneously provides unity gain and a Constant phase shift of 90° for sinusoidal inputs of varying frequency is described. It employs the voltage derived from a quadrature detector to modify the resistance of a voltage-controlled resistor incorporated in an active allpass phase shifter circuit.
Keywords :
active networks; all-pass filters; phase shifters; active circuit; allpass phase shifter; constant phase shift; quadrature phase shifter; unity gain; voltage-controlled resistor;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19840299
