Design of Square-Root Domain Filters

  • Authors:

  • Gwo-Jeng Yu;Chun-Yueh Huang;Bin-Da Liu;Jenn-Jiun Chen

  • Affiliations:

  • Department of Electrical Engineering, National Cheng Kung University, Tainan, Taiwan, R.O.C. 70101;Department of Electronic Engineering, Kun Shan University of Technology, Tainan, Taiwan, R.O.C. 71003;Department of Electrical Engineering, National Cheng Kung University, Tainan, Taiwan, R.O.C. 70101;Department of Electrical Engineering, National Cheng Kung University, Tainan, Taiwan, R.O.C. 70101

  • Venue:
  • Analog Integrated Circuits and Signal Processing
  • Year:
  • 2005

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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 驴 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.