10GHz dual-conversion low-IF downconverter with microwave and analogue quadrature generators

J. S. Syu*, Chin-Chun Meng, Y. H. Teng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A 10GHz dual-conversion low-IF downconverter using 0.18-m CMOS technology is demonstrated. The high-frequency quadrature RF and LO1 signals are generated by broadside-coupled quadrature couplers while a two-section polyphase filter is utilised for the low-frequency LO2 quadrature signal generation. As a result, the demonstrated downconverter achieves a conversion gain of 7dB, IP1dB of -16dBm, IIP3 of -5dBm and noise figure of 26dB at a 1.8V supply. The image-rejection ratio of the first/second image signal is 33/42dB for IF frequency ranging from 10 to 60MHz, respectively.

Original languageEnglish
Pages (from-to)685-686
Number of pages2
JournalElectronics Letters
Volume45
Issue number13
DOIs
StatePublished - 14 Jul 2009

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