A 34% tuning range CMOS VCO with linear frequency tuning

  • Authors:

  • Kwang-Hoe Koo;Sang-Woong Yoon;Chang-Woo Kim

  • Affiliations:

  • Department of Electronic and Radio Engineering, Kyung Hee University, Youngin-Si, Gyeonggi-Do, Korea;Department of Electronic and Radio Engineering, Kyung Hee University, Youngin-Si, Gyeonggi-Do, Korea;Department of Electronic and Radio Engineering, Kyung Hee University, Youngin-Si, Gyeonggi-Do, Korea

  • Venue:
  • RWS'09 Proceedings of the 4th international conference on Radio and wireless symposium
  • Year:
  • 2009

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Abstract

A CMOS voltage controlled oscillator (VCO) with additional parallel resistors in its LC resonator has been proposed to improve the tuning (frequency-to-voltage) linearity and reduce the tuning sensitivity KVCO. The VCO is linearly tunable from 806 to 1,113 MHz with a 34% tuning range controlled linearly by the tuning voltage. The phase noise of the VCO is -100.4 dBc/Hz at 100-kHz offset frequency from 903MHz carrier. The supply voltage was 1.8V with the current of 2.5 mA flowing through the differential core. The chip size is 0.815 × 0.680 mm2, which has been fabricated in a standard 180-nm CMOS technology.