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1 April 1990 Noise characterization of GaAs MESFETs for the design of optical amplifiers
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The principal noise sources of GaAs MESFETs are taken into account in order to completely characterize the equivalent circuit model that has been utilized in the design of a low-noise small-signal amplifier for optical receivers. The total input noise current of the amplifier, due to correlated gate and drain MESFET noise, has been estimated for evaluating the excess channel noise factor ? for different values of the photodiode capacitance. A method is demonstrated for easy identification of the matching network parameters and photodiode capacitance that mmimize the noise. Finally, the minimum noise gain, gain-frequency dependence, input and output voltage standing wave ratios, noise figure, and bandwidth of the amplifier are evaluated in the 8 to 12 GHz frequency range. A gain of 22.1 ± 1 dB and a noise figure less than 3 dB in a bandwidth larger than 4 GHz are obtained.
Anna Gina Perri, Mario Nicola Armenise, and Francesco Corsi "Noise characterization of GaAs MESFETs for the design of optical amplifiers," Optical Engineering 29(4), (1 April 1990).
Published: 1 April 1990

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