Measurement of p-n-junction diode behavior under large signal and high frequency

Fernandes, Maria Augusta R. B. L.; Santos, Edval J. P.

doi:10.1109/sbmicro.2014.6940086

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2020

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“…Such protection is needed in case a negative voltage is accidentally applied to the TCA input or transient spikes occur. Having four 1N4148 diodes in series (D2-D5) limits the minimum output voltage to about −3 V and has a capacitance below 1 pF over a wide frequency range [32].…”

Section: Practical Designmentioning

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: Practical Designmentioning

confidence: 99%