Design of Square-Root Domain Filters
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Abstract
In this paper, a square-root domain band-pass filter and biquad filter which are based on the MOSFET square law are proposed. Both of the square-root domain filters operated at 2.5 V supply voltage are constituted by current mirrors, current-mode square-root circuits and capacitors. The circuits presented have been simulated and fabricated using 0.25 μ m CMOS process. Both of simulation and measured results which are in good agreement indicate that the center frequency f0 is not only attainable at megahertz frequencies but also tunable electronically. The proposed circuits have the merits of high frequency operation, tuneability, low power supply voltage operation, low third order intermodulation distortion and low total harmonic distortion.
Key Words
square-root domain filter square-root domain band-pass filter square-root domain biquad filter current mirror current-mode square-root circuit system-on-a-chipPreview
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