Low-Power and Low-Phase-Noise Gm-Enhanced Current-Reuse Differential Colpitts VCO

Kuang Wei Cheng, Sheng Kai Chang, Yu Chieh Huang

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


A Colpitts voltage-controlled oscillator (VCO) is presented for low-power and low-phase-noise applications. The current efficiency of the proposed VCO is improved through gm-enhanced and current-reuse techniques. In addition, a clover-shaped inductor is employed to mitigate electromagnetic interference (EMI) effects. The VCO is implemented in a 0.18-μm CMOS process and is shown to operate at frequencies of 2.34 to 2.55 GHz with a tuning range of 8.6%. The prototype has a power dissipation of 1.4 mW and achieves a phase noise of-122.85 dBc/Hz at a 1 MHz frequency offset.

Original languageEnglish
Article number8678442
Pages (from-to)733-737
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Issue number5
Publication statusPublished - 2019 May

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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