Full 360° Phase Shifting of Injection-Locked Oscillators

Abstract

A novel design is presented to produce analog phase shift of 0° to 360° in optically controlled oscillators which are subharmonically injection-locked. The proposed concept was analytically described and experimentally demonstrated by producing 360° of phase shift in an 8 GHz oscillator that is indirect optically injection-locked to a 4 GHz subharmonic frequency. This design concept could eliminate the need for switched delayline phase shifters in the T/R modules of optically controlled phased array antennas, thus making T/R module more compact and efficient. © 1993 IEEE