Title :
Designing an ultra low phase noise 4.5 GHz VCO using multiple coupled resonators and MOS devices
Author :
Rohde, Ulrich L.
Author_Institution :
Synergy Microwave Corp., Paterson, NJ, USA
Abstract :
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.
Keywords :
MOSFET circuits; circuit tuning; coupled circuits; feedback oscillators; microwave oscillators; phase noise; strip line resonators; varactors; voltage-controlled oscillators; 4.5 GHz; 5 GHz; NMOS transistors; PMOS transistors; multiple coupled resonators; push-pull oscillator; source RF feedback; tuned elements; ultra low phase noise VCO; varactors; Capacitance; Coupling circuits; Feedback; Frequency; MOS devices; MOSFETs; Phase noise; Spirals; Transconductance; Voltage-controlled oscillators;
Conference_Titel :
Radio Frequency integrated Circuits (RFIC) Symposium, 2005. Digest of Papers. 2005 IEEE
Print_ISBN :
0-7803-8983-2
DOI :
10.1109/RFIC.2005.1489823
