Experimental Study of Photodiode Response Using the Photocurrent Shot Noise Spectrum
The photocurrent shot noise was measured by a modulation method in the frequency range from 0.15 to 400 Mc. The spectral characteristics of noise were investigated for FD-3 and FDK-1 commercial photodiodes and also for germanium photodiodes of two types (thin-base diffused and coaxial surface-barrier diodes). Measurements of the frequency characteristics were also made on the same diodes, using the radiation flux from a helium—neon laser (λ = 0.63 μ) modulated by a Kerr cell. It was found that, for the FD-3 and FDK-1 photodiodes, the relation between the limiting frequencies, given by the frequency characteristic and spectral characteristic of noise, is governed by the relation between the carrier diffusion time in the base and the time constant of the RC circuit. The limiting frequencies determined from the two characteristics are in satisfactory agreement for the thin-base diffused photodiodes. For the surfacebarrier photodiodes the spectral and frequency characteristics have no descending part in the frequency range covered by the measurements.
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