A current-reused voltage-controlled oscillator with balanced enlarged amplitude via decoupling capacitance adoption

作者：Kuo, Ko Chi^*; Lin, Shun Dao; Hou, Hsiao Han

来源：Microwave and Optical Technology Letters, 2012, 54(7): 1626-1629.

DOI：10.1002/mop.26904

• VCO
• current-reused
• low power

This article presents a low-power current-reused voltage-controlled oscillator (VCO) with a decoupling capacitance. The proposed VCO applies a decoupling capacitance between the power supply and degeneration resistance in the VCO to reduce the unbalanced characteristics of the current-reused VCO. Adopting the decoupling capacitance can balance and enlarge the output amplitude while enhancing the phase noise. The simulated amplitude unbalance ratio is 5%, compared with 11% of the amplitude unbalance ratio of a conventional current-reused VCO. In addition, the proposed design enlarges the amplitude by 25%, compared with the amplitude of a conventional current-reused VCO without increasing power consumption. The proposed design has been fabricated in a TSMC 0.18-mu m CMOS process. The power consumption is 1.6 mW from a 1.8 V supply. The fabricated VCO operates from 2.1 to 2.7 GHz with a 22.7% tuning range. The measured phase noise is -121 dBc/Hz at 1 MHz offset at 2.2 GHz.

• 出版日期2012-7
• 单位中山大学