Experimental Evaluation of Wide Range Injection Locking in a CMOS RC Oscillator

Eduardo Ortigueira, Luís Augusto Bica Gomes de Oliveira, Jorge R. Fernandes, Manuel de Medeiros Silva

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


CMOS RC oscillators have low area, can be built with a low cost technology, and have a wide tuning range, but they have higher phase-noise than LC oscillators. This can be overcome by synchronizing the oscillator by injection-locking with an low phase-noise external source. We present here an experimental study of injection-locking in an RC two-integrator oscillator. First and second harmonic injection in different locations of the oscillator are investigated. A test circuit was fabricated using a standard CMOS technology with 1.2 V supply. Measurement results show that a phase noise improvement of more than 30 dB, can be obtained with only -30 dBm injected signal between 100 kHz and 10 MHz frequency offset over a wide frequency range (600 MHz to 3 GHz).
Original languageEnglish
Title of host publicationCircuits and Systems (ISCAS), 2014 IEEE International Symposium on
Publication statusPublished - 2014
EventIEEE Int. Symp. Circuits and Systems (ISCAS’14) -
Duration: 1 Jan 2014 → …


ConferenceIEEE Int. Symp. Circuits and Systems (ISCAS’14)
Period1/01/14 → …


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