Explicit design formulas for current-mode leap-frog OTA-C filters and 300 MHz CMOS seventh-order linear phase filter
作者： James Moritz , Yichuang Sun , Xi Zhu
DOI: 10.1002/CTA.V38:4
关键词: Network synthesis filters 、 m-derived filter 、 Control theory 、 Electronic filter topology 、 Low-pass filter 、 Voltage-controlled filter 、 Active filter 、 Prototype filter 、 Filter design 、 Mathematics
摘要: The leap-frog (LF) configuration is an important structure in analogue filter design. Voltage-mode LF OTA-C filters have recently been studied the literature; however, general explicit formulas do not exist for current-mode and there also need LF-based structures realization of arbitrary transmission zeros. Three are presented, including basic with input distributor or output summer. They can realize all-pole characteristics functions Explicit design derived directly from these synthesis of, respectively, zero up to sixth order. regular straightforward use. As illustrative example, a 300 MHz seventh-order linear phase low-pass zeros presented. implemented using fully differential operational transconductance amplifier (OTA) based on source degeneration topology. Simulations standard TSMC 0.18µm CMOS process 2.5 V power supply shown that cutoff frequency ranges 260 320 MHz, group delay ripple about 4.5p over whole tuning range, noise 420nA-√Hz, dynamic range 66 dB consumption 200 mW. Copyright © 2008 John Wiley & Sons, Ltd.
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