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標題: A 5.2-GHz GaInP/GaAs HBT double-quadrature downconverter with polyphase filters for 40-dB image rejection
作者: Meng, C.C.
Sung, D.W.
Huang, G.W.
關鍵字: double-quadrature downconverter
GaInP/GaAs heterojunction bipolar
transistor (HBT)
Gilbert mixer
image rejection
polyphase filter
期刊/報告no:: Ieee Microwave and Wireless Components Letters, Volume 15, Issue 2, Page(s) 59-61.
摘要: 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 IV 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.
ISSN: 1531-1309
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