Input protection of low-current DC amplifiers by GaAsP diodes

Damljanović, D.D.; Arandjelovic, V.

doi:10.1088/0022-3735/14/4/005

Cited by 11 publications

(3 citation statements)

References 10 publications

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“…This could be due to nonlinearities in the I -V characteristics which have been reported by Sah et al (1957). It may be noted that I 0 of general silicon diodes is of the order of nano amperes and the measured I 0 of GaAs devices is 5-6 orders lower than the silicon diode (Damljanovic and Arandjelovic 1981).…”

Section: I-v Characteristics Of Ledsmentioning

confidence: 72%

“…From the band gap difference between silicon and GaAs devices, the I 0 of GaAs devices should be 6-7 orders of magnitude lower than that of silicon. Damljanovic and Arandjelovic (1981) have shown that I 0 is of the order of 10 −20 A for some LEDs. This significant property of the material of LED makes it suitable as a nonlinear element of log amplifier for low current applications.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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Logarithmic current electrometer using light emitting diodes

Acharya

Aggarwal

1996

Meas. Sci. Technol.

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The limit of low current measurement using logarithmic current to voltage converter is improved by 6-7 orders of magnitude with the use of diodes of large band gap as compared with silicon diodes. Low cost commercially available light emitting diodes (LEDs) have been used for this purpose. A theoretical study and experimental measurement of device constant and reverse saturation currents of the whole class of commercially available LEDs has been carried out. A circuit has been developed which makes use of a new technique for temperature compensation and its performance is compared with the technique in common use. The performance of the amplifier is found to be stable in the temperature range 5-60 • C for both polarity of signals from 10 −12 to 10 −5 A.

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Section: I-v Characteristics Of Ledsmentioning

confidence: 72%

Section: Theoretical Backgroundmentioning

confidence: 99%

Logarithmic current electrometer using light emitting diodes

Acharya

Aggarwal

1996

Meas. Sci. Technol.

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“…It is estimated that the reverse saturation current of the green LED is of the order of 10 20 A (Damljanovic and Arandjelovic 1981). Moreover, LEDs are commercially available at very low cost as compared with to low leakage diodes or transistors.…”

Section: Introductionmentioning

confidence: 99%

Stability and error analysis of the LED-logarithmic electrometer

Acharya¹,

Vyavahare²

1999

International Journal of Electronics

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Theoretical analysis of the stability and error in the LED-logarithmic electrometer is presented. It has been shown that a resistance in series with the log element improves the response by a factor of 7 at 1 pA. Error analysis of the electrometer, involving mainly device parameter sensitivity, is also presented. It has been found that variation in temperature and change in value of the device constant are more important factors than other device parameters in in¯uencing the variation in the output voltage. An eight-decade temperature compensated LED-logarithmic electrometer is designed for the measurement of low currents from 1 pA to 0.1 mA and has been tested for its performance in the temperature range of 20 to 70 ë C.

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Temperature characteristics of the device constant (n) of a light emitting diode

Acharya

Vyavahare²

1999

Solid-State Electronics

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Input protection of low-current DC amplifiers by GaAsP diodes

Cited by 11 publications

References 10 publications

Logarithmic current electrometer using light emitting diodes

Logarithmic current electrometer using light emitting diodes

Stability and error analysis of the LED-logarithmic electrometer

Temperature characteristics of the device constant (n) of a light emitting diode

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