TY - JOUR
T1 - A widely tunable CMOS Gm-C filter with a negative source degeneration resistor transconductor
AU - Hori, Shinichi
AU - Maeda, Tadashi
AU - Yano, Hitoshi
AU - Matsuno, Noriaki
AU - Numata, Keiichi
AU - Yoshida, Nobuhide
AU - Takahashi, Yuji
AU - Yamase, Tomoyuki
AU - Walkington, Robert
AU - Hida, Hikaru
PY - 2003/12/1
Y1 - 2003/12/1
N2 - 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.
AB - 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.
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U2 - 10.1109/ESSCIRC.2003.1257169
DO - 10.1109/ESSCIRC.2003.1257169
M3 - Conference article
AN - SCOPUS:20244387605
SN - 1930-8833
SP - 449
EP - 452
JO - European Solid-State Circuits Conference
JF - European Solid-State Circuits Conference
M1 - 1257169
T2 - 29th European Solid-State Circuits Conference, ESSCIRC 2003
Y2 - 16 September 2003 through 18 September 2003
ER -