Title :
-Band
pHEMT Gilbert Mixers With Polyphase and Coupled-Line Quadrature Generators
Author :
Su, Jen-Yi ; Tseng, Sheng-Che ; Meng, Chinchun ; Wu, Po-Yi ; Lee, Yueh-Ting ; Huang, Guo-Wei
Author_Institution :
Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu
fDate :
5/1/2009 12:00:00 AM
Abstract :
In this paper, three kinds of Kalpha/Ku-band Gilbert mixers are demonstrated using 0.15- mum AlGaAs/InGaAs pseudomorphic high electron mobility transistor technology. Thanks to the semiinsulating GaAs substrate, microwave passive components have a low-loss feature, and polyphase filters work up to higher frequencies. Highly accurate tantalum-nitride thin-film resistors utilized in polyphase filters result in perfect quadrature operation. Therefore, our proposed single-sideband up-converter operates at 15 GHz with a 63-dB sideband rejection ratio, and another 34-GHz in-phase/quadrature (I/Q) subharmonic down-converter reaches <0.4-dB magnitude and < 1deg phase errors. More than 50-dB local oscillator (LO) leakage suppression is achieved in the I/Q subharmonic mixer. On the other hand, a 40-GHz stacked-LO subharmonic mixer with a novel compensation technique is also proposed and demonstrated to improve LO speed and reduce the amount of transistors, as compared to previous work.
Keywords :
III-V semiconductors; MMIC mixers; aluminium compounds; field effect MMIC; gallium arsenide; high electron mobility transistors; indium compounds; microwave filters; microwave frequency convertors; tantalum compounds; thin film resistors; AlGaAs-InGaAs; GaAs; Ka/Ku-band pHEMT Gilbert mixers; TaN; coupled-line quadrature generators; in-phase/quadrature subharmonic down-converter; local oscillator leakage suppression; microwave passive components; polyphase filters; pseudomorphic high electron mobility transistor; semiinsulating substrate; single-sideband up-converter; size 0.15 mum; tantalum-nitride thin-film resistors; Compensation; down-converter; polyphase filter; pseudomorphic HEMT (pHEMT); quadrature; single sideband (SSB); subharmonic; up-converter;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2009.2017242