NDLI: A quadrature modulator with enhanced harmonic rejection filter

Content Provider	IEEE Xplore Digital Library
Author	Peng-Un Su Hsu, J.-M.
Copyright Year	2002
Description	Author affiliation: SoC Technol. Center, Ind. Technol. Res. Inst., Hsinchu, Taiwan (Peng-Un Su; Hsu, J.-M.)
Abstract	When using a current-commutating quadrature modulator in a wireless transmitter, undesired spurs are generated at 3f/sub LO/, 5f/sub LO/, and so on, thus requiring a good filter to suppress those unwanted signals. By using the non-ideal characteristic of the non-zero output resistance of the amplifier in a Sallen-Key filter, a second order low-pass filter with transmission zeros is proposed. In this paper, the filter is designed and simulated using a 0.35 /spl mu/m SiGe BiCMOS model provided by TSMC. The designed 4/sup th/-order low-pass filter with a parasitic pole, implemented by cascading two biquads and an amplifying stage, outperformed a 9/sup th/-order AC-coupled RC low-pass filter not only in size, but also in suppression characteristics and current consumption.
Starting Page	319
Ending Page	322
File Size	233451
Page Count	4
File Format	PDF
ISBN	0780373634
DOI	10.1109/APASIC.2002.1031596
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-08-08
Publisher Place	Taiwan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power harmonic filters Low pass filters Frequency Transmitters Band pass filters Transfer functions Filtering theory Local oscillators Q factor Electronic mail
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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