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Universal Filter Based on Compact CMOS Structure of VDDDA.

Winai Jaikla1, Fabian Khateb2,3, Tomasz Kulej4

  • 1Department of Engineering Education, Faculty of Industrial Education and Technology, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand.

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Summary

This study introduces a compact universal filter using the voltage differencing differential difference amplifier (VDDDA). The novel design achieves multiple filter responses with independent control over frequency and bandwidth, validated by simulation and experimental results.

Keywords:
VDDDAbiquad filtermultiple-input techniqueoperational transconductance amplifier

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Area of Science:

  • Electronics
  • Analog Integrated Circuit Design
  • Signal Processing

Background:

  • Existing voltage differencing differential difference amplifier (VDDDA) structures often lack compactness and simplicity.
  • The multiple-input metal oxide semiconductor (MOS) transistor technique offers a path to simplified integrated circuit designs.

Purpose of the Study:

  • To propose and validate a novel, compact universal filter circuit utilizing the voltage differencing differential difference amplifier (VDDDA).
  • To demonstrate the filter's capability to achieve multiple frequency responses (LP, BP, BR, HP, AP) with independent parameter control.
  • To compare simulation results with experimental data for verification.

Main Methods:

  • Design and simulation of a universal filter employing two VDDDAs, one resistor, and two grounded capacitors using Cadence and a 0.18-µm TSMC CMOS process.
  • Implementation and testing of the filter using commercial components (LM13700, AD830).
  • Analysis of filter characteristics including frequency response, input/output impedance, noise, and distortion.

Main Results:

  • The proposed filter achieves low-pass, band-pass, band-reject, high-pass, and all-pass responses with unity passband gain.
  • Orthogonal control of natural frequency and bandwidth is achieved via separate transconductance adjustments without impacting passband gain.
  • For a band-pass configuration, the filter exhibits an RMS noise of 46 µV, IMD3 of -49.5 dB, and a dynamic range of 73.2 dB.
  • Simulation results closely match experimental findings, confirming the circuit's efficacy.

Conclusions:

  • The presented VDDDA-based universal filter offers a compact and simple solution compared to existing CMOS structures.
  • The design provides versatile filtering capabilities with independent control over key parameters.
  • The agreement between simulated and experimental results validates the proposed filter's performance and practical applicability.