A CMOS Quadrature VCO With Subharmonic and Injection-Locked Techniques

作者：Lee Shuenn Yuh^*; Wang Liang Hung; Lin Yu Heng

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, 2010, 57(11): 843-847.

DOI：10.1109/TCSII.2010.2082990

• Frequency doubled
• injection locked
• oscillator
• quadrature
• radio-frequency complementary metal-oxide-semiconductor (RF CMOS)
• subharmonic
• voltage-controlled oscillator (VCO)

A 1-V quadrature voltage-controlled oscillator (QVCO) using subharmonic and injection-locked techniques (SHIL-QVCO) is presented. Instead of using the traditional transformer-coupling LC tank with a large area to implement the quadrature output, we use a frequency-doubled differential pair with an injection-locked method. The proposed QVCO is implemented with a TSMC 0.18-mu m 1P6M CMOS process having a 1.4 x 0.67 mm(2) chip area. This QVCO has the advantages of low phase noise and low power consumption. Experimental results show that the QVCO has a phase noise of -126 dBc/Hz at an offset frequency of 1 MHz and a power consumption of 4.9 mW to achieve a 186 figure of merit. Moreover, a tuning frequency between 2.17 and 2.52 GHz can be obtained with a tuning voltage range of 0-1 V for the IEEE 802.15.4.

• 出版日期2010-11