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In small-signal analysis, a MOSFET transistor amplifier acts as a linear amplifier when operating in its saturation region. The gate-to-source voltage (VGS) of the MOSFET is the sum of the DC biasing voltage and the small time-varying input signal. This combination sets up the operating point and modulates the drain current (ID) that flows from the drain to the source. When a small AC signal is superimposed on the DC bias voltage at the gate, the instantaneous drain current comprises three...
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Shadow Filters Using Multiple-Input Differential Difference Transconductance Amplifiers.

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

  • 1Department of Telecommunications Engineering, School of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand.

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Summary
This summary is machine-generated.

This study introduces novel low-power voltage-mode shadow filters using a multiple-input differential difference transconductance amplifier (MI-DDTA). These filters offer electronic tunability and simplified circuit design for efficient analog signal processing.

Keywords:
analog filterdifferential difference transconductance amplifiermultiple-input MOS techniqueshadow filter

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Area of Science:

  • Electrical Engineering
  • Analog Integrated Circuit Design
  • Signal Processing

Background:

  • Traditional analog filters often face limitations in tunability and component count.
  • The development of versatile active building blocks is crucial for advanced circuit design.

Purpose of the Study:

  • To present novel voltage-mode shadow filters utilizing a low-power multiple-input differential difference transconductance amplifier (MI-DDTA).
  • To demonstrate the advantages of the proposed filters, including circuit simplicity and electronic control.

Main Methods:

  • Design and simulation of a novel MI-DDTA.
  • Implementation of voltage-mode shadow filters based on the MI-DDTA.
  • Validation using SPICE simulations with 0.18 μm CMOS process parameters.

Main Results:

  • The proposed MI-DDTA offers multiple-input voltage-mode arithmetic operations and electronic tuning.
  • The developed shadow filters exhibit circuit simplicity, minimal active/passive elements, and electronic control of natural frequency and quality factor.
  • The MI-DDTA operates at a low supply voltage (±0.5 V) with low power consumption (9.94 μW).

Conclusions:

  • The proposed MI-DDTA is a suitable building block for low-power analog signal processing applications.
  • The novel voltage-mode shadow filters provide efficient and electronically tunable solutions.
  • The simulation results confirm the functionality and workability of the presented circuits.