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A 2.4/5.7-GHz dual-band dual-conversion downconverter is demonstrated using 0.35-mum SiGe heterojunction bipolar transistor (HBT) technology. This downconverter employs a complex dual-conversion system and a complex filter to reject the first and second image signals, respectively. The LO1 frequency is 2.5 times the LO2 frequency and is generated by a divide-by-two divider, a frequency doubler and...
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