A Mixer With Third-Order Nonlinearity Cancellation Technique for CDMA Applications

Author

Kim, Woonyun ; Keum, Dongjin ; Kang, Sanghoon ; Park, Byeong-Ha

Author_Institution

Samsung Electron., Gyeonggi-Do

Volume

17

Issue

1

fYear

2007

Firstpage

76

Lastpage

78

Abstract

A feedforward technique to improve the third-order nonlinearity of mixers in a direct conversion transceiver is presented. The third-order intermodulation (IM3) generated by the main transconductance (G_m) stage of mixer with inductively degenerated emitter is cancelled by that generated by the sub-G_m stage with degeneration resistor. The circuit allows the mixer to be optimized independently, and has minimal impact on noise figure (NF), gain, area, and current consumption. The proposed technique reduced IM3 by approximately 16 dB with a current increase of approximately 7%. The mixer achieved an input-referred third-order intercept point of 5 dBm, a gain of 37 dB, and an NF of 9.8 dB drawing 7.9 mA from a 2.85-V supply. The transceiver including the calibration circuitry was implemented in a SiGe bipolar transistor with f_T= 35GHz for U.S. cellular code division multiple access application

Keywords

Ge-Si alloys; bipolar transistor circuits; code division multiple access; intermodulation distortion; microwave mixers; 2.85 V; 35 GHz; 7.9 mA; 9.8 dB; SiGe; bipolar transistor; code division multiple access; degeneration resistor; intermodulation distortion; microwave mixers; third-order nonlinearity cancellation; Calibration; Circuits; Gain; Multiaccess communication; Noise figure; Noise measurement; Resistors; Silicon germanium; Transceivers; Transconductance; Intermodulation distortion (IMD); mixers;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2006.887283

Filename

4052375