A LC Voltage-Controlled Oscillator Tuned by Switched Step Capacitors:Part II,Circuit Design and Implementation

Tang Zhangwen; He Jie; Min Hao

Chin. J. Semicond. > 2005, Volume 26 > Issue 11 > 2182-2190

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A LC Voltage-Controlled Oscillator Tuned by Switched Step Capacitors:Part II,Circuit Design and Implementation

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Abstract: A novel LC oscillator differentially tuned by switched step capacitors,which is implemented in a CMOS 0.25μm 1P4M CMOS process,is proposed to verify our theoretical analysis of tuning characteristics.The tuning capacitance of the proposed switched step capacitors is 146% of the conventional inversion-MOS varactors’.In the 1/f~3 region,the novel differentially tuned topology has 7dB phase noise reduction compared to the single-ended tuned topology.The implemented VCO at 1.013GHz has a phase noise of -83,-107, and -130dBc/Hz, at a 10kHz,100kHz, and 1MHz offset,respectively.Power consumption is 8.6mW.

Key words: step capacitors, MOS varactors, switched step capacitors, voltage-controlled oscillator, oscillator tuning curves, period calculation technique

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Received: 19 August 2015 Revised: Online: Published: 01 November 2005

A novel LC oscillator differentially tuned by switched step capacitors,which is implemented in a CMOS 0.25μm 1P4M CMOS process,is proposed to verify our theoretical analysis of tuning characteristics.The tuning capacitance of the proposed switched step capacitors is 146% of the conventional inversion-MOS varactors’.In the 1/f~3 region,the novel differentially tuned topology has 7dB phase noise reduction compared to the single-ended tuned topology.The implemented VCO at 1.013GHz has a phase noise of -83,-107, and -130dBc/Hz, at a 10kHz,100kHz, and 1MHz offset,respectively.Power consumption is 8.6mW.

A LC Voltage-Controlled Oscillator Tuned by Switched Step Capacitors:Part II,Circuit Design and Implementation

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