A feedforward noise and distortion cancellation technique for CMOS broadband LNA-mixer

Author

Chi-Fu Li ; Shih-Chieh Chou ; Chang-Ming Lai ; Cuei-Ling Hsieh ; Liu, Jenny Yi-Chun ; Po-Chiun Huang

Author_Institution

Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan

fYear

2014

fDate

10-12 Nov. 2014

Firstpage

337

Lastpage

340

Abstract

This work presents a circuit technique for broadband LNA-mixer to improve the noise and distortion performance simultaneously. By introducing an auxiliary feedforward path that carries the LNA noise and third-order intermodulation distortion (IM3) with equal magnitude and opposite phase to mixer output, the overall noise and IM3 are reduced while the signal is enhanced. The power overhead is small compared to the conventional tradeoff between the power consumption and linearity performance. The test circuit using a 0.18μm CMOS process includes a shunt-feedback LNA and two cross-coupled active mixers. All the circuits consume 7.7 mA from a 1.8 V supply. The signal bandwidth is 2 GHz. At 900MHz the voltage gain and noise figure are 19 dB and 6.2 dB respectively. There is 2.7dB NF and 10.1dB IM3 improvements with only 15% power overhead.

Keywords

CMOS analogue integrated circuits; UHF mixers; low noise amplifiers; CMOS broadband LNA-mixer; CMOS process; IM3; LNA noise; auxiliary feedforward path; bandwidth 2 GHz; circuit technique; cross-coupled active mixers; current 7.7 mA; distortion cancellation technique; feedforward noise; frequency 900 MHz; gain 19 dB; linearity performance; mixer output; noise figure; noise figure 2.7 dB; noise figure 6.2 dB; power consumption; power overhead; shunt-feedback LNA; signal bandwidth; size 0.18 mum; test circuit; third-order intermodulation distortion; voltage 1.8 V; voltage gain; Feedforward neural networks; Linearity; Mixers; Noise cancellation; Transconductance; Wideband; broadband; linearization; low power; noise and distortion cancellation; shunt-feedback;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference (A-SSCC), 2014 IEEE Asian

Conference_Location

KaoHsiung

Print_ISBN

978-1-4799-4090-5

Type

conf

DOI

10.1109/ASSCC.2014.7008929

Filename

7008929