Injection Locked Oscillator Automatic Frequency Centering Method And Apparatus

Ron D. Katznelson, Broadband Innovations, Inc.
Brani A. Petrovic, Broadband Innovations, Inc.

Abstract

A method for centering the frequency of an injection locked oscillator or (ILO) includes producing measurements of the magnitude and sign of the phase difference between ILO output signals in response to alternate high level and low level RF drive signals, and tuning the center frequency of the ILO in accordance with the measurements to minimize the phase difference.