Noise spectra in balanced optical detectors based on transimpedance amplifiers.
Rev Sci Instrum
; 88(11): 113109, 2017 Nov.
Article
en En
| MEDLINE
| ID: mdl-29195404
ABSTRACT
We present a thorough theoretical analysis and experimental study of the shot and electronic noise spectra of a balanced optical detector based on an operational amplifier connected in a transimpedance scheme. We identify and quantify the primary parameters responsible for the limitations of the circuit, in particular, the bandwidth and shot-to-electronic noise clearance. We find that the shot noise spectrum can be made consistent with the second-order Butterworth filter, while the electronic noise grows linearly with the second power of the frequency. Good agreement between the theory and experiment is observed; however, the capacitances of the operational amplifier input and the photodiodes appear significantly higher than those specified in manufacturers' datasheets. This observation is confirmed by independent tests.
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01-internacional
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MEDLINE
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En
Revista:
Rev Sci Instrum
Año:
2017
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Article
País de afiliación:
Rusia