A Widely Tunable CMOS Gm-C Filter
نویسندگان
چکیده
This paper describes a new widely tunable transconductor that can realize a channel-select filter having both of these characteristics. The transconductor includes a new negative source degeneration resistor. The paper also discusses the measured results obtained for the 6-order elliptic LPF adopting this new circuit. 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 comprises a linearized 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 wide gm tuning.
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