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The CMOS Highly Linear Current Amplifier with Current Controlled Gain for Sensor Measurement Applications.

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This study presents a novel linear current amplifier for precise measurements. Its design emphasizes low total harmonic distortion (THD) and linear gain control, offering efficient current consumption for sensor and analog signal processing applications.

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Area of Science:

  • Electronics Engineering
  • Analog Circuit Design

Background:

  • Precise measurement applications require amplifiers with high linearity and controlled gain.
  • Existing current multipliers often suffer from high total harmonic distortion (THD) and non-linear gain control.

Purpose of the Study:

  • To introduce a new current-controlled current-amplifier with enhanced linearity and precise gain control.
  • To achieve low total harmonic distortion (THD) for accurate signal processing.

Main Methods:

  • Developed an uncommon topology using linear sub-blocks with MOS transistors in their linear region.
  • Fabricated the circuit using a 0.35-µm ON Semiconductor process (C035 I3T25).
  • Verified performance through laboratory measurements and compared with Cadence simulation results.

Main Results:

  • Achieved low total harmonic distortion (THD) and linear gain control.
  • Exhibited low input and high output impedances.
  • Demonstrated current consumption comparable to the maximum processed input current (±200 µA).

Conclusions:

  • The novel current amplifier is suitable for precise measurement and sensor applications.
  • The topology is adaptable to modern CMOS technologies and lower supply voltages.
  • Laboratory measurements confirmed simulation results, validating the circuit's performance.