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1 V Tunable High-Quality Universal Filter Using Multiple-Input Operational Transconductance Amplifiers.

Montree Kumngern1, Fabian Khateb2,3,4, Tomasz Kulej5

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Summary
This summary is machine-generated.

This study introduces a novel voltage-mode universal filter using multiple-input operational transconductance amplifiers (MI-OTAs) for low-voltage, low-frequency applications. The filter achieves versatile filtering functions with independently tunable parameters and low power consumption.

Keywords:
operational transconductance amplifieruniversal filtervoltage-mode circuit

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Area of Science:

  • Electrical Engineering
  • Analog Integrated Circuit Design
  • Signal Processing

Background:

  • Operational transconductance amplifiers (OTAs) are fundamental building blocks in analog circuit design.
  • Universal filters offer flexibility in signal processing by providing multiple filter responses from a single topology.
  • Low-voltage and low-power circuit designs are crucial for modern portable and integrated electronic systems.

Purpose of the Study:

  • To present a new multiple-input single-output (MISO) voltage-mode universal filter.
  • To enable versatile filtering functions (low-pass, high-pass, band-pass, band-stop, all-pass) in a single circuit.
  • To achieve independent electronic tunability of natural frequency and quality factor in a low-voltage, low-power design.

Main Methods:

  • Implementation of a novel universal filter topology using four multiple-input operational transconductance amplifiers (MI-OTAs) and three grounded capacitors.
  • Utilization of the bulk-driven multiple-input MOS transistor technique to realize multiple inputs for the OTA.
  • Independent control of natural frequency and quality factor through transconductance and capacitance ratios.

Main Results:

  • The proposed filter simultaneously realizes low-pass, high-pass, band-pass, band-stop, and all-pass responses with both non-inverting and inverting transfer functions.
  • Achieved independent electronic tunability of the natural frequency and quality factor.
  • Demonstrated low-voltage operation (1 V supply), low power consumption (120 μW at 5 μA setting current), 40 dB dynamic range, and -43.6 dB third intermodulation distortion.

Conclusions:

  • The proposed MI-OTA-based voltage-mode universal filter is suitable for low-voltage, low-frequency applications.
  • The circuit offers high performance with versatile and independently tunable filtering characteristics.
  • Simulation results confirm the effectiveness and feasibility of the proposed filter topology.