A widely tunable CMOS Gm-C filter with a negative source degeneration resistor transconductor

Shinichi Hori, Tadashi Maeda, Hitoshi Yano, Noriaki Matsuno, Keiichi Numata, Nobuhide Yoshida, Yuji Takahashi, Tomoyuki Yamase, Robert Walkington, Hikaru Hida

Research output: Contribution to journalConference articlepeer-review

47 Citations (Scopus)


We propose a new negative source degeneration resistor (NSDR) transconductor to achieve a wide continuous-tuning range gm-C filter applicable for IEEE802.11a/b/g wireless-LANs and W-CDMA. The NSDR-transconductor using a source degeneration resistor and positive feedback differential amplifier that acts as a negative resistor. This configuration enables the equivalent source degeneration resistance to be drastically increased without degrading linearity, thus resulting in a wide gm tuning. A 6th -order elliptic low-pass filter using this NSDR-transconductor exhibits a cutoff frequency (fc) tuning range of 1.5-12MHz, which is two times wider than that of conventional filters. Additionally, we introduce a new figure of merit (FoM) evaluating the basic filter performance. This filter shows 0.35 fj (FoM) in the IEEE802.11a mode, which is, to our best knowledge, the best value in the CMOS channel-select filters.

Original languageEnglish
Article number1257169
Pages (from-to)449-452
Number of pages4
JournalEuropean Solid-State Circuits Conference
Publication statusPublished - 2003 Dec 1
Externally publishedYes
Event29th European Solid-State Circuits Conference, ESSCIRC 2003 - Estoril, Portugal
Duration: 2003 Sep 162003 Sep 18

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering


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