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Designing an ultra low phase noise 4.5 GHz VCO using multiple coupled resonators and MOS devices

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1 Author(s)
Rohde, U.L. ; Synergy Microwave Corp., Paterson, NJ, USA

This paper shows a 4.5 GHz center frequency push-pull oscillator based on the use of NMOS and PMOS transistors, the use of multiple-coupled resonators as tuned elements, and source RF feedback for improved phase noise. Two MOS transistors are used as varactors. At 5 GHz and 1 MHz offset, the phase noise is -118 dBc/Hz. This paper gives detailed insight into the design procedure of the oscillator, including the device selection.

Published in:

Radio Frequency integrated Circuits (RFIC) Symposium, 2005. Digest of Papers. 2005 IEEE

Date of Conference:

12-14 June 2005