JSTS:Journal of Semiconductor Technology and Science

The Institute of Electronics and Information Engineers (대한전자공학회)
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A Fully Differential RC Calibrator for Accurate Cut-off Frequency of a Programmable Channel Selection Filter

  • Nam, Ilku (Dept. of Electrical Engineering and PNU-LG Smart Control Center, Pusan National University) ;
  • Choi, Chihoon (Dept. of Electrical Engineering and PNU-LG Smart Control Center, Pusan National University) ;
  • Lee, Ockgoo (Dept. of Electrical Engineering and PNU-LG Smart Control Center, Pusan National University) ;
  • Moon, Hyunwon (School of Electronic and Electric Engineering, Daegu University)
  • Received : 2016.03.11
  • Accepted : 2016.05.02
  • Published : 2016.10.30
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Abstract

A fully differential RC calibrator for accurate cut-off frequency of a programmable channel selection filter is proposed. The proposed RC calibrator consists of an RC timer, clock generator, synchronous counter, digital comparator, and control block. To verify the proposed RC calibrator, a six-order Chebyshev programmable low-pass filter with adjustable 3 dB cut-off frequency, which is controlled by the proposed RC calibrator, was implemented in a $0.18-{\mu}m$ CMOS technology. The channel selection filter with the proposed RC calibrator draws 1.8 mA from a 1.8 V supply voltage and the measured 3 dB cut-off frequencies of the channel selection LPF is controlled accurately by the RC calibrator.

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References

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