Continuous phase shift of sinusoidal signals using injection locked oscillators

• Published in: IEEE microwave and wireless components letters Vol. 15; no. 5; pp. 312 - 314
• Main Authors: Lopez-Villegas, J.M., Macias, J.G., Osorio, J.A., Cabanillas, J., Sieiro, J.J., Samitier, J., Vidal, N.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-05-2005; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Circuit optimization; Circuit properties; Circuit testing; Circuits electrònics; Circuits of signal characteristics conditioning (including delay circuits); CMOS analog integrated circuits (ICs); Diodes; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Exact sciences and technology; Frequency; injection locked oscillators (ILOs); Injection-locked oscillators; Modulació (Electrònica); Modulation (Electronics); Multichip modules; multichip modules (MCMs); Oscillators, resonators, synthetizers; Phase noise; Phase shifters; Signal generators; Varactors; Prototype; CMOS analog integrated circuits (ICs); Multichip module; Phase shift; multichip modules (MCMs); Continuous phase; Phase shifter; Implementation; injection locked oscillators (ILOs); phase shifters; Frequency shift; Varactor diode; Second harmonic; CMOS analogue integrated circuits; Sinusoidal signal; Harmonic oscillator; Injection locked oscillators
• ISSN: 1531-1309; 1558-1764
• DOI: 10.1109/LMWC.2005.847690

This work presents an alternative to generate continuous phase shift of sinusoidal signals based on the use of super harmonic injection locked oscillators (ILO). The proposed circuit is a second harmonic ILO with varactor diodes as tuning elements. In the locking state, by changing the varactor bias, a phase shift instead of a frequency shift is observed at the oscillator output. By combining two of these circuits, relative phases up to /spl plusmn/90/spl deg/ could be achieved. Two prototypes of the circuit have been implemented and tested, a hybrid version working in the range of 200-300 MHz and a multichip module (MCM) version covering the 900-1000 MHz band.