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Low 1/f noise CMOS active mixers for direct conversion

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3 Author(s)
Manstretta, D. ; Dipt. di Elettronica, Pavia Univ., Italy ; Castello, R. ; Svelto, F.

The analysis of direct conversion CMOS active mixers tailored to ReFlex standard is presented. To minimize 1/f noise, the switching stage pMOS devices have large area, low biasing current. pMOS and nMOS transconductors shunted together form the input stage. A 0.35-μm prototype performs at 900 MHz as follows: 18 dB SSB NF averaged in the 100 Hz-3 kHz band, 18 dB gain, -4-dBm IIP3, 30-dBm IIP2 with 6 mA from 2.7-V supply

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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:48 ,  Issue: 9 )