DocumentCode :
3279911
Title :
20 GHz integrated CMOS frequency sources with a quadrature VCO using transformers
Author :
Ko, Sangsoo ; Kim, Jeong-Geun ; Song, Tdeksang ; Yoon, Euisik ; Hong, Songcheol
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
fYear :
2004
fDate :
6-8 June 2004
Firstpage :
269
Lastpage :
272
Abstract :
A fully integrated 20 GHz frequency source is implemented with a VCO and a doubler in a 0.18 μm CMOS process. A 10 GHz quadrature voltage controlled oscillator (QVCO) is implemented using a transformer-coupled resonator. The VCO can be tuned between 10.2 and 11.4 GHz and has low phase noise of -118.67 dBc/Hz at 1 MHz offset frequency with 1.8 V power supply. The figure of merit (FOM) is 188 dB. The 20 GHz differential signal is generated by harmonics of quadrature signals of the VCO with a balanced frequency doubler. To increase the output power of the harmonics, pinch-off clipping is used without any buffers or DC level shifter, since the proposed VCO has RF signals with low DC level. The frequency multiplier, the output of which can be tuned between 19.8 and 22 GHz, has a low noise of - 111.67 dBc/Hz at 1 MHz offset frequency. The phase noise of the multiplier is 7 dB higher than that of the VCO. The output power is -6.83 dBm and the VCO output power is -6 dBm.
Keywords :
CMOS analogue integrated circuits; MMIC oscillators; circuit tuning; frequency multipliers; harmonic oscillators (circuits); high-frequency transformers; microwave generation; phase noise; voltage-controlled oscillators; 0.18 micron; 1.8 V; 10 GHz; 10.2 to 11.4 GHz; 19.8 to 22 GHz; 20 GHz; QVCO tuning; VCO quadrature signals; balanced frequency doubler; frequency multiplier; harmonic generated differential signals; integrated CMOS frequency sources; low DC level RF signals; phase noise; pinch-off clipping; quadrature voltage controlled oscillator; transformer based quadrature VCO; transformer-coupled resonator; CMOS process; Frequency conversion; Millimeter wave technology; Phase noise; Power generation; Power supplies; Power system harmonics; Signal generators; Transformers; Voltage-controlled oscillators;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Radio Frequency Integrated Circuits (RFIC) Symposium, 2004. Digest of Papers. 2004 IEEE
ISSN :
1529-2517
Print_ISBN :
0-7803-8333-8
Type :
conf
DOI :
10.1109/RFIC.2004.1320593
Filename :
1320593
Link To Document :
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