DocumentCode :
2725042
Title :
An inherently linear phase-oversampling vector modulator in 90-nm CMOS
Author :
Tseng, Richard ; Li, Hao ; Kwon, Dae Hyun ; Poon, Ada S Y ; Chiu, Yun
Author_Institution :
Univ. of Illinois at Urbana-Champaign, Urbana, IL, USA
fYear :
2009
fDate :
16-18 Nov. 2009
Firstpage :
257
Lastpage :
260
Abstract :
A four-antenna vector modulator (VM) beamforming receiver in 90-nm CMOS operating between 2.4 and 4.9 GHz is presented. The VM is based on a phase-oversampling technique that allows the synthesis of inherently linear, high-resolution complex gains without complex variable gain amplifiers. It achieves 360° phase shift programmability with 8-bit digital control, a measured < 4.2° phase error at a back-off of 4 dB from the maximum gain setting, and a complex gain constellation with a mean error vector magnitude of < 2%. The monolithic beamformer also demonstrates an interference cancellation of > 24 dB for interferers impinging from different directions.
Keywords :
CMOS integrated circuits; field effect MMIC; microwave antenna arrays; microwave receivers; modulators; radiofrequency interference; 360° phase shift programmability; 8-bit digital control; CMOS beamforming IC; complex gain constellation; four-antenna vector modulator beamforming receiver; frequency 2.4 GHz to 4.9 GHz; inherently linear high-resolution complex gain; interference cancellation; interferers impinging; phase error; phase-oversampling technique; size 90 nm; Array signal processing; Digital control; Error correction; Gain measurement; Interference cancellation; Optical modulation; Phase measurement; Phase modulation; Vectors; Virtual manufacturing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Solid-State Circuits Conference, 2009. A-SSCC 2009. IEEE Asian
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-4433-5
Electronic_ISBN :
978-1-4244-4434-2
Type :
conf
DOI :
10.1109/ASSCC.2009.5357262
Filename :
5357262
Link To Document :
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