A source coupled differential CMOS complementary colpitts oscillator with on-chip transformer tank

作者：Cha Choong Yul^*

来源：IEEE Transactions on Microwave Theory and Techniques, 2008, 56(5): 1076-1082.

DOI：10.1109/TMTT.2008.921265

• CMOS
• complementary Colpitts (C-Colpitts)
• differential
• oscillator
• phase noise
• transformer

A source coupled differential CMOS complementary Colpitts (C-Colpitts) oscillator with an on-chip transformer tank is proposed. Additionally, the on-chip transformer is analyzed through electromagnetic simulation, and the equivalent circuit is modeled with lumped components. The Q factor of an on-chip transformer is compared with symmetrical inductors, which have almost the same inductance. The proposed source coupled differential C-Colpitts oscillator is fabricated with 0.18-mu m CMOS technology. With 1.4-V supply voltage, the oscillator shows phase noise of -145.6 dBc at 3-MHz offset in 1.8-GHz oscillation frequency.

• 出版日期2008-5