期刊
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
卷 54, 期 3, 页码 458-468出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSI.2006.887633
关键词
common-mode feedback (CMFB); equalization; G(m)-C filters; operational transconductance amplifier (OTA)-C filter; programmable boost; programmable OTA
A 330-MHz fifth-order G(m)-C continuous-time low-pass filter with 24-dB boost is presented. Existing solutions are found to be unsuitable for low-power, wide-band, and high-boost operation. The proposed solution realizes two symmetric real axis zeros by efficiently combining transfer functions associated with all nodes of cascaded biquad cells. Application of Gilbert cell as a variable transconductor, for achieving constant parasitic capacitance across wide programmability range, is illustrated. A new common-mode feedback error amplifier that improves common-mode accuracy without compromising on bandwidth or circuit complexity is introduced. A prototype is fabricated in a standard 0.35-mu m CMOS process. Experimental results show -41 dB of IM3 for 250-mV peak-peak swing with 43 mW of power dissipation.
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