Analysis, Design, and X-Band Implementation of a Self-Biased Active Feedback G(m)-Boosted Common-Gate CMOS LNA

作者：Chamas Ibrahim Ramez^*; Raman Sanjay

来源：IEEE Transactions on Microwave Theory and Techniques, 2009, 57(3): 542-551.

DOI：10.1109/TMTT.2009.2013297

• CMOS
• low-noise amplifier (LNA)
• noise figure (NF)
• noise matching
• radio frequency integrated circuits (RFICs)

This paper explores the use of active feedback to boost the transconductance of a common-gate (CG) low-noise amplifier and achieve simultaneous low noise and input power match. Unlike transformer coupled topologies, the CG input stage is dc-coupled to a self-biased common-source feedback amplifier (for g(m) boosting), thus eliminating the need of external bias circuitry. Noise and intermodulation analysis with and without g(m) boosting are extensively studied yielding closed-form expressions of the noise figure (NF) and third-order input-referred intercept point (IIP3) that are useful for circuit design and optimization. A 9.6-GHz differential prototype implemented in a 0.18-mu m technology using only NMOS transistors, achieves a minimum NIT of 4 dB, an IIP3 of -11.3 dBm, a return loss of -17 dB, and a transducer gain of 18 dB while dissipating 10 in (excluding buffer circuit) from a 1.8-V supply voltage. The active chip area is 0.11 mu m(2).

• 出版日期2009-3