디지털/아날로그 입력을 통한 백게이트 튜닝 2.4 GHz VCO 설계

A 2.4GHz Back-gate Tuned VCO with Digital/Analog Tuning Inputs

  • 오범석 (동국대학교 반도체과학과) ;
  • 이대희 (동국대학교 반도체과학과) ;
  • 정웅 (동국대학교 반도체과학과)
  • Oh, Beom-Seok (Dept. of Semiconductor Science, Dongguk University) ;
  • Lee, Dae-Hee (Dept. of Semiconductor Science, Dongguk University) ;
  • Jung, Wung (Dept. of Semiconductor Science, Dongguk University)
  • 발행 : 2003.11.15

초록

In this work, we have designed a fully integrated 2.4GHz LC-tuned voltage-controlled oscillator (VCO) with multiple tuning inputs for a $0.25-{\mu}m$ standard CMOS Process. The design of voltage-controlled oscillator is based on an LC-resonator with a spiral inductor of octagonal type and pMOS-varactors. Only two metal layer have been used in the designed inductor. The frequency tuning is achieved by using parallel pMOS transistors as varactors and back-gate tuned pMOS transistors in an active region. Coarse tuning is achieved by using 3-bit pMOS-varactors and fine tuning is performed by using back-gate tuned pMOS transistors in the active region. When 3-bit digital and analog inputs are applied to the designed circuits, voltage-controlled oscillator shows the tuning feature of frequency range between 2.3 GHz and 2.64 GHz. At the power supply voltage of 2.5 V, phase noise is -128dBc/Hz at 3MHz offset from the carrier, Total power dissipation is 7.5 mW.

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