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Low-Power Architecture and Circuit Techniques for High-Boost Wide-Band Gm–C Filters

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4 Author(s)
Manisha Gambhir ; Dept. of Electr. & Comput. Eng., Texas A&M Univ., College Station, TX ; Vijay Dhanasekaran ; Jose Silva-Martinez ; Edgar Sanchez-Sinencio

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-mum 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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IEEE Transactions on Circuits and Systems I: Regular Papers  (Volume:54 ,  Issue: 3 )