Title :
Microcontroller based precision variable-phase phase-shifter
Author :
Rao, Smitha ; Kumar, Varadarajan Jagadeesh ; Sankaran, P.
Author_Institution :
Dept. of Electr. Eng., Inst. of Technol., Madras, India
Abstract :
An analog and digital feedback compensation technique employing an active RC all pass filter is described for obtaining a frequency and amplitude independent, drift free phase shift for sinusoidal signals. While the analog feedback for realising the active R is of conventional type, the digital feedback for controlling C is implemented with a modified successive approximation (SA) technique. The implementation of the SA scheme employing discrete digital ICs as well as a microcomputer is described. A prototype built works well over a frequency range of 20 Hz to 50 kHz and has a phase stability of ±0.2
Keywords :
active filters; all-pass filters; compensation; microcontrollers; phase shifters; SA technique; active RC all pass filter; analog feedback; digital feedback; digital feedback compensation technique; discrete digital ICs; drift free phase shift; microcontroller based precision variable-phase phase-shifter; modified successive approximation; phase stability; sinusoidal signals; Alternators; Digital control; Digital filters; FETs; Feedback; Frequency; Microcontrollers; Stability; Video recording; Voltage;
Conference_Titel :
Electronic Technology Directions to the Year 2000, 1995. Proceedings.
Conference_Location :
Adelaide, SA
Print_ISBN :
0-8186-7085-1
DOI :
10.1109/ETD.1995.403462
