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The CMOS Highly Linear Current Amplifier with Current Controlled Gain for Sensor Measurement Applications.
Roman Prokop1, Roman Sotner2, Vilem Kledrowetz1
1Department of Microelectronics, Brno University of Technology (BUT), Technicka 3058/10, 61600 Brno, Czech Republic.
Sensors (Basel, Switzerland)
|August 23, 2020
Summary
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.
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.
Keywords:
CMOSaccuracycurrent amplifiercurrent controlled gainelectronic controllinearitysensor signal processingMore Related Videos
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