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0.5 V, Low-Power Bulk-Driven Current Differencing Transconductance Amplifier.

Montree Kumngern¹, Fabian Khateb^2,3, Tomasz Kulej⁴

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

Sensors (Basel, Switzerland)

|November 9, 2024

Summary

This summary is machine-generated.

This study introduces a novel low-power, low-voltage current differencing transconductance amplifier (CDTA) using bulk-driven MOS transistor (BD-MOST) technology. This innovative CDTA enables a versatile current-mode universal filter with independent control over frequency and quality factor.

Keywords:

active filter bulk-driven MOS transistor current differencing transconductance amplifier current-mode circuit low-voltage low-power circuit

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Area of Science:

Electronics
Analog Integrated Circuit Design
Signal Processing

Background:

Low-power and low-voltage analog circuit design is crucial for modern portable and battery-operated electronic systems.
Current Differencing Transconductance Amplifiers (CDTAs) are versatile active building blocks for analog signal processing.
Existing CDTA designs often face limitations in terms of power consumption and operating voltage.

Purpose of the Study:

To present a novel low-power, low-voltage current differencing transconductance amplifier (CDTA).
To demonstrate the application of the proposed CDTA in realizing a current-mode universal filter.
To achieve a filter with independent control over its parameters and without component-matching conditions.

Main Methods:

Utilizing the bulk-driven MOS transistor (BD-MOST) technique operating in the subthreshold region for low-voltage and low-power operation.
Designing the CDTA using 0.18 µm CMOS technology.
Implementing a current-mode universal filter using the proposed CDTA, capable of realizing five standard filter functions.

Main Results:

The proposed CDTA operates at a low supply voltage of 0.5 V and consumes only 1.05 μW of power.
The current-mode universal filter realizes low-pass, band-pass, high-pass, band-stop, and all-pass responses from a single circuit configuration.
The filter exhibits low-input and high-output impedance, uses grounded capacitors, and allows orthogonal control of natural frequency and quality factor.
SPICE simulations confirm the feasibility and functionality of the CDTA and the filter circuit.

Conclusions:

The developed BD-MOST based CDTA offers a significant advancement in low-power, low-voltage analog circuit design.
The proposed current-mode universal filter provides a flexible and efficient solution for various filtering applications.
The circuit's ability to achieve multiple filter functions and independent parameter control makes it highly suitable for integrated circuit implementations.