20 GHz integrated CMOS frequency sources with a quadrature VCO using transformers

Sangsoo Ko, Jeong Geun Kim, Taeksang Song, Euisik Yoon, Songcheol Hong

Research output: Contribution to conferencePaper

45 Citations (Scopus)

Abstract

A fully integrated 20 GHz frequency source is implemented with a VCO and a doubler in 0.18 μm CMOS process. A 10 GHz quadrature voltage controlled oscillator (QVCO) is implemented using 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 output power of harmonics, a pinch-off clipping is used without any buffers and DC level shifter, since the proposed VCO has RF signals with low DC level. The frequency multiplier of which output can be tuned between 19.8 and 22 GHz has 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.

Original languageEnglish
Pages269-272
Number of pages4
Publication statusPublished - 2004 Sep 20
EventDigest of Papers - 2004 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium - Fort Worth, TX, United States
Duration: 2004 Jun 62004 Jun 8

Other

OtherDigest of Papers - 2004 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium
CountryUnited States
CityFort Worth, TX
Period04/6/604/6/8

Fingerprint

Variable frequency oscillators
Phase noise
Frequency doublers
Frequency multiplying circuits
Resonators

All Science Journal Classification (ASJC) codes

  • Media Technology
  • Electrical and Electronic Engineering

Cite this

Ko, S., Kim, J. G., Song, T., Yoon, E., & Hong, S. (2004). 20 GHz integrated CMOS frequency sources with a quadrature VCO using transformers. 269-272. Paper presented at Digest of Papers - 2004 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, Fort Worth, TX, United States.
Ko, Sangsoo ; Kim, Jeong Geun ; Song, Taeksang ; Yoon, Euisik ; Hong, Songcheol. / 20 GHz integrated CMOS frequency sources with a quadrature VCO using transformers. Paper presented at Digest of Papers - 2004 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, Fort Worth, TX, United States.4 p.
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Ko, S, Kim, JG, Song, T, Yoon, E & Hong, S 2004, '20 GHz integrated CMOS frequency sources with a quadrature VCO using transformers', Paper presented at Digest of Papers - 2004 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, Fort Worth, TX, United States, 04/6/6 - 04/6/8 pp. 269-272.

20 GHz integrated CMOS frequency sources with a quadrature VCO using transformers. / Ko, Sangsoo; Kim, Jeong Geun; Song, Taeksang; Yoon, Euisik; Hong, Songcheol.

2004. 269-272 Paper presented at Digest of Papers - 2004 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, Fort Worth, TX, United States.

Research output: Contribution to conferencePaper

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N2 - A fully integrated 20 GHz frequency source is implemented with a VCO and a doubler in 0.18 μm CMOS process. A 10 GHz quadrature voltage controlled oscillator (QVCO) is implemented using 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 output power of harmonics, a pinch-off clipping is used without any buffers and DC level shifter, since the proposed VCO has RF signals with low DC level. The frequency multiplier of which output can be tuned between 19.8 and 22 GHz has 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.

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Ko S, Kim JG, Song T, Yoon E, Hong S. 20 GHz integrated CMOS frequency sources with a quadrature VCO using transformers. 2004. Paper presented at Digest of Papers - 2004 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, Fort Worth, TX, United States.