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Design of a Tunable 4th Order OTA-C Band-Pass Filter for Use in Front-End of ADC

Document Type : Research article

Authors

Department of Electrical Engineering, University of Guilan, Persian Gulf Highway, Rasht 41996-13776, Iran

Abstract

This article presents a tunable fourth-order band-pass filter that is designed using an operational trans-conductance amplifier (OTA), which can be used as an anti-aliasing filter (AAF) in the front-end of an analog-to-digital converter (ADC). It is necessary to use a suitable filter to prevent unwanted signals from entering the ADC. The bandwidth of the AAF should be designed according to the bandwidth of the ADC, therefore, matching these two bandwidths is one of the important challenges when using multi-bandwidth analog to digital converters in digital communication applications. The proposed band-pass filter is designed and simulated in 180 nm CMOS technology. The simulation results show that by changing the two bias voltages of the proposed filter, its bandwidth can be changed according to the frequency range of ADSL, ADSL2, and ADSL2+ communication standards and it effectively attenuates unwanted signals.

Highlights

  • A low-power tunable fourth-order band-pass filter to eliminate unwanted signals for use in the front-end of ADCs is designed.
  • The filter structure is only based on operational transconductance amplifiers (OTA) and integrated capacitors.
  • The proposed filter is simulated in 180 nm CMOS technology at the transistor level and is implemented in schematic and layout form.
  • The power consumption of the proposed filter is 327 nW.
  • The proposed filter does not need the off-chip capacitors.

Keywords

Main Subjects

References
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Journal of Applied Research in Electrical Engineering
Volume 2, Issue 2
Summer and Autumn 2023
July 2023
Pages 152-157
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History
  • Receive Date: 04 January 2023
  • Revise Date: 23 November 2023
  • Accept Date: 27 November 2023
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