Phase-frequency calibration of a sine wave oscillator using Wienbridge arrangement

Abstract

A method of measuring phase changes within the positive feedback loop of a sine wave oscillator without terminating the oscillations is presented. This involves the use of a reference network, outside the loop, which is an exact replica of the positive feedback network of the oscillator. Such phase changes produce new frequencies and thus a phase-frequency curve of the oscillator was obtained and calibrated.

Keywords: feedback-loop, phase, frequency, calibration

Nigerian Journal of Physics Vol. 17, 2005: 78-82