A High-Transconductance Voltage-to-Current Converter Design

Mathew, M.; Hayatleh, K.; Hart, B.L.

doi:10.1007/s00034-010-9193-5

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…There are examples of TCAs with higher bandwidth [25], [26], higher output current [15]- [18], or higher precision [15]. However, our device provides a unique combination of these properties optimized for various applications of LEDs in optical metrology.…”

Section: Discussionmentioning

confidence: 99%

Transconductance Amplifier for Optical Metrology Applications of Light-Emitting Diodes

Dönsberg

Poikonen

Ikonen

2020

IEEE Trans. Instrum. Meas.

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Light-emitting diodes (LEDs) have many applications in optical metrology. Depending on the measurement scheme, an LED might be driven, for example, using constant current, amplitude or pulsewidth modulated current, or current pulses. We present the design and characterization of a transconductance amplifier (TCA) optimized to drive LEDs in optical metrology applications. The device is capable of delivering peak and root mean square (rms) currents up to 10 and 1 A, respectively, and has a selectable transconductance ranging from 100 µS to 10 S. The typical cutoff frequency for the current output is around 10 MHz for various types of LEDs.

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Section: Discussionmentioning

confidence: 99%

Transconductance Amplifier for Optical Metrology Applications of Light-Emitting Diodes

Dönsberg

Poikonen

Ikonen

2020

IEEE Trans. Instrum. Meas.

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“…Generally, the catalytic combustion gas sensor adopts the Wheatstone bridge method to collect the signal [ 12 , 13 ], which keeps track of the sensitive cells with the platinum thin-film thermal resistor changes owing to the changes in the oxidation reaction producing heat, which reflects the essential features. However, the temperature of the sensor has a long time delay; therefore, the resistance changes leads to a long signal response time.…”

Section: Experimental Methodsmentioning

confidence: 99%

Design and Experimentation with Sandwich Microstructure for Catalytic Combustion-Type Gas Sensors

Zhang

Jiang

2014

Sensors

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The traditional handmade catalytic combustion gas sensor has some problems such as a pairing difficulty, poor consistency, high power consumption, and not being interchangeable. To address these issues, integrated double catalytic combustion of alcohol gas sensor was designed and manufactured using silicon micro-electro-mechanical systems (MEMS) technology. The temperature field of the sensor is analyzed using the ANSYS finite element analysis method. In this work, the silicon oxide-PECVD-oxidation technique is used to manufacture a SiO2-Si3N2-SiO2 microstructure carrier with a sandwich structure, while wet etching silicon is used to form a beam structure to reduce the heat consumption. Thin-film technology is adopted to manufacture the platinum-film sensitive resistance. Nano Al2O3-ZrO-ThO is coated to format the sensor carrier, and the sensitive unit is dipped in a Pt-Pd catalyst solution to form the catalytic sensitive bridge arm. Meanwhile the uncoated catalyst carrier is considered as the reference unit, realizing an integrated chip based on a micro double bridge and forming sensors. The lines of the Pt thin-film resistance have been observed with an electronic microscope. The compensation of the sensitive material carriers and compensation materials have been analyzed using an energy spectrum. The results show that the alcohol sensor can detect a volume fraction between 0 and 4,500 × 10−6 and has good linear output characteristic. The temperature ranges from −20 to +40 °C. The humidity ranges from 30% to 85% RH. The zero output of the sensor is less than ±2.0% FS. The power consumption is ≤0.2 W, and both the response and recovery time are approximately 20 s.

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