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A CMOS direct down-converter with outstanding dynamic range performances

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4 Author(s)
Brandolini, M. ; Dipt. di Elettronica, Universita di Pavia, Italy ; Rossi, P. ; Sanzogni, D. ; Svelto, F.

The mechanisms responsible for second order inter-modulation distortion in a direct down-converter are addressed, giving rise to the following design strategy: the transconductor is degenerated by means of an RC filter with pole equal to the signal bandwidth, an LC filter resonating at RF frequency loads the switching pair and carefully matched load resistors develop voltage gain. Prototypes realized in 0.18μm CMOS show: +78dBm IIP2 minimum among 40 samples, +10dBm IIP3, 4nV/VHz input-referred noise density while burning only 4mA from 1.8V.

Published in:

IEEE-NEWCAS Conference, 2005. The 3rd International

Date of Conference:

19-22 June 2005