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Operational amplifiers (op-amps) are versatile devices that extend beyond amplification. In this context, two specific op-amp configurations are explored: the summing and difference amplifiers.
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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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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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A difference amplifier, a crucial component in numerous electronic devices, ideally amplifies only the difference-mode signal, which is the difference between two input signals. However, in practical circuits, the output voltage depends on both the differential gain and the common-mode gain.
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Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
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0.5-V 281-nW Versatile Mixed-Mode Filter Using Multiple-Input/Output Differential Difference Transconductance

Fabian Khateb1,2,3, Montree Kumngern4, Tomasz Kulej5

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Summary
This summary is machine-generated.

This study introduces a novel low-voltage mixed-mode filter using a multiple-input/output differential difference transconductance amplifier (MIMO-DDTA). This versatile filter achieves minimal power consumption, making it ideal for biomedical and sensor applications.

Keywords:
differential difference transconductance amplifiermixed-mode filteroperational transconductance amplifieruniversal filter

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Area of Science:

  • Electrical Engineering
  • Analog Integrated Circuit Design
  • Signal Processing

Background:

  • Mixed-mode filters are crucial for signal processing, but often suffer from high power consumption and limited functionality.
  • Existing designs struggle to achieve versatility and low power simultaneously, especially for low-voltage applications.

Purpose of the Study:

  • To present a new versatile mixed-mode filter with extremely low power consumption and low voltage operation.
  • To demonstrate a single topology capable of performing multiple filtering functions in various modes.

Main Methods:

  • Utilized a multiple-input/output differential difference transconductance amplifier (MIMO-DDTA) architecture.
  • Employed a multiple-input bulk-driven MOS transistor (MI-BD-MOST) technique for simplified input stage.
  • Implemented a single filter topology to achieve five standard filtering functions across four operating modes (VM, CM, TAM, TIM).

Main Results:

  • Achieved a versatile mixed-mode filter with twenty distinct filtering functions in a single topology.
  • Demonstrated ultra-low power consumption (281 nW) at a 0.5 V supply voltage and 4 nA setting current.
  • Obtained a dynamic range of 58.23 dB for the voltage-mode low-pass filter at 1% THD.

Conclusions:

  • The proposed low-voltage mixed-mode filter offers significant advantages in terms of versatility, power efficiency, and structural simplicity.
  • Its suitability for low-frequency biomedical and sensor applications requiring nano-watt power consumption and minimal supply voltage is confirmed.
  • The electronically tunable natural frequency via setting current enhances its practical applicability.