Low-power architecture and circuit techniques for high-boost wide-band G(m)-C filters
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abstract
A 330-MHz fifth-order Gm-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-m CMOS process. Experimental results show -41 dB of IM3 for 250-mV peak-peak swing with 43 mW of power dissipation. 2007 IEEE.