Title :
A 5.2-GHz GaInP/GaAs HBT double-quadrature downconverter with polyphase filters for 40-dB image rejection
Author :
Meng, C.C. ; Sung, D.W. ; Huang, G.W.
Author_Institution :
Dept. of Commun. Eng., Nat. Chiao Tung Univ., Taiwan, Taiwan
Abstract :
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.
Keywords :
III-V semiconductors; MMIC frequency convertors; MMIC mixers; bipolar MMIC; gallium arsenide; heterojunction bipolar transistors; indium compounds; microwave filters; 11 dB; 15 to 40 MHz; 5 GHz; 5.17 GHz; 5.2 GHz; GaInP-GaAs; Gilbert downconversion mixer; double-quadrature downconverter; heterojunction bipolar transistor; image rejection; intermediate frequency; local quadrature signals; low parasitic semi-insulating substrate; polyphase filters; radio frequency quadrature signals; thin film resistors; Filters; Gallium arsenide; Heterojunction bipolar transistors; RF signals; Radio frequency; Receivers; Resistors; Semiconductor thin films; Signal generators; Substrates;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2004.842813
