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ISM 주파수 대역 송신기를 위한 900-㎒ 집적형 CMOS LC-VCO
이낙원(Nakwon Lee),범진욱(Jinwook Burm) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
This paper presents a CMOS LC-VCO (Voltage Controlled Oscillator) for ISM band transmitters. To reduce phase noise, varactor gain is minimized, and extra frequency range covered with capacitor bank arrays. And, bias current is controlled by DAC for prevent variations of output power and phase noise. This work is designed with 0.25㎛ RF CMOS process. The VCO gain is 159 ㎒/1V, and power consumption is 1.8~3.6 ㎽. The VCO output phase noise is -119~-130 ㏈c/㎐ at 1 ㎒ offset, and output power is -1.2 ㏈m, at least.