A 2-V/sub pp/ 80-200-MHz fourth-order continuous-time linear phase filter with automatic frequency tuning |
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Authors: | Mingdeng Chen Silva-Martinez J Rokhsaz S Robinson M |
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Affiliation: | Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA; |
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Abstract: | A CMOS 80-200-MHz fourth-order continuous-time 0.05/spl deg/ equiripple linear phase filter with an automatic frequency tuning system is presented. An operational transconductance amplifier based on transistors operating in triode region is used and a circuit that combines common-mode feedback, common-mode feedforward, and adaptive bias is introduced. The chip was fabricated in a 0.35-/spl mu/m process; filter experimental results have shown a total harmonic distortion less than -44 dB for a 2-V/sub pp/ differential input with a single 2.3-V power supply. The group delay ripple is less than 4% for frequencies up to 1.5 f/sub c/. The frequency tuning error is below 5%. |
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