U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

Chopped Radiation Measurement With Large Area Si Photodiodes

Published

Author(s)

George P. Eppeldauer

Abstract

Frequency dependent response characteristics of photocurrent meters using large area, radiometric quality Si photodiodes have been analyzed. The current responsivity, the voltage noise and drift amplicication, and the gain and bandwidth of the photocurrent-measuring analog control loop were calculated. The photodiodes were selected for high shunt resistance. The effect of the photodiode junction capacitance on the response characteristics was also analyzed. As a result of photocurrent gain dependent frequency compensations, the noise boosting effect was minimized at the output of the current meter. The loop gain and bandwidth were maximized. High-accuracy photocurrent measurements can be achieved using the described procedures for both DC and modulated optical radiation.
Citation
Metrologia
Pub Type
Journals

Keywords

bandwidth, chopped radiation, control loop, noise boosting, photocurrent, photodiode, radiometry, responsivity, silicon

Citation

Eppeldauer, G. (2008), Chopped Radiation Measurement With Large Area Si Photodiodes, Metrologia (Accessed May 5, 2024)

Created October 16, 2008