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A novel integrated quadrature voltage controlled oscillator(QVCO) with a feedback current source is presented in this paper.Benefiting from the current adjusting function of the feedback current source,the proposed QVCO exhibits a uniform phase noise over the entire tuning range.This QVCO is implemented in 65-nm CMOS technology.The measurement results show that it draws less than 3-mA average current from a 1.2-V supply and the phase noise is less than -110 dBc/Hz @1MHz offset over the entire tuning range.The fluctuation of phase noise @1MHz offset from the center frequency of 2.84-GHz to 3.27-GHz is less than 1 dBc/Hz,which validates the correctness of the proposed current source feedback technique.
A novel integrated quadrature voltage controlled oscillator (QVCO) with a feedback current source is presented in this paper. Beneficial from the current adjusting function of the feedback current source, the proposed QVCO exhibits a uniform phase noise over the entire tuning range. Here QVCO is implemented in 65-nm CMOS technology. The measurement results show that it draws less than 3-mA average current from a 1.2-V supply and the phase noise is less than -110 dBc / Hz @ 1MHz offset over the entire tuning range. fluctuation of phase noise @ 1 MHz offset from the center frequency of 2.84-GHz to 3.27-GHz is less than 1 dBc / Hz, which validates the correctness of the proposed current source feedback technique.