A Low Voltage and Low Power Bottom-Series Coupled Quadrature VCO

作者：Jang Sheng Lyang^*; Lee Tai Sung; Hsue Ching Wen; Chang Chia Wei

来源：IEEE Microwave and Wireless Components Letters, 2009, 19(11): 722-724.

DOI：10.1109/LMWC.2009.2032015

• Bottom-series coupled quadrature voltage-controlled oscillator (QVCO)
• CMOS
• transformers

This letter presents a new low power quadrature voltage-controlled oscillator (QVCO), which consists of two complementary cross-coupled voltage-controlled oscillators (VCOs) with split-source tail inductors. The bottom-series coupling transistors are in parallel with the tail inductors and require no dc voltage headroom. The proposed CMOS QVCO has been implemented with the TSMC 0.18 mu m CMOS technology and the die area is 0.512 x 1.065 mm(2). At the supply voltage of 1.1 V, the total power consumption is 2.545 mW. The free-running frequency of the QVCO is tunable from 4.38 to 4.71 GHz as the tuning voltage is varied from 0.0 V to 0.6 V. The measured phase noise at 1 MHz frequency offset is 120.8 dBc/Hz at the oscillation frequency of 4.4 GHz and the figure of merit (FOM) of the proposed QVCO is 189.61 dBc/Hz.

• 出版日期2009-11