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A 5.2-GHz GaInP/GaAs HBT double-quadrature downconverter with polyphase filters for 40-dB image rejection

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3 Author(s)
Meng, C.C. ; Dept. of Commun. Eng., Nat. Chiao Tung Univ., Taiwan, Taiwan ; Sung, D.W. ; Huang, G.W.

A 5.2-GHz 11-dB gain, IP1 dB=-17 dBm and IIP3=-10 dBm double-quadrature Gilbert downconversion mixer with polyphase filters is demonstrated by using GaInP/GaAs heterojunction bipolar transistor (HBT) technology. The image rejection ratio is better than 40 dB when LO=5.17 GHz and intermediate frequency (IF) is in the range of 15 MHz to 40 MHz. The Gilbert downconverter has four-stage RC-CR IF polyphase filters for image rejection. Polyphase filters are also used to generate local (LO) and radio frequency (RF) quadrature signals around 5 GHz in the double-quadrature downconverter because GaAs has accurate thin film resistors and the low parasitic semi-insulating substrate.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:15 ,  Issue: 2 )