Projeto e otimização de pre-amplificadores de transimpedancia para recepção optica em 1 Gbit/s

AUTOR(ES)
DATA DE PUBLICAÇÃO

1989

RESUMO

This work shows the design and implementation of transimpedance pre-amplifiers for optical receivers working up to 1 Gbit/s. They are GaAs MESFET two-stage amplifiers fed by a PIN photodiode. Three pre-amplifiers were designed. In the first circuit an a.c. coupling between amplifying stages was used while, in the second, a d.c. coupling was used. For both circuits a d.c. study was carried out taking into account the operating dynamic range. The a.c. analysis used Y parameters and some expressions are shown that allows the determination of the behavior of the circuits The K parameter and the stability circles in the Smith Chart were used in the stability analysis. In particular, the large influence of the stray capacitance of the feedback resistor in the overall circuit stability was investigated The receiver sensitivity computed included the effect of the 1/f transistor noise. A value of -31.3 dBm for the sensitivity was obtained for 1 Gbit/s transmission. The third pre-amplifier was designed uSlng a d c bias arrangement that allows a simultaneous upgrading range and sensitivity of the circuit. of the dynamic. All three circuits were implementeded and tested. The experimental values obtained were expected in close agreement with the expected theoretical prediction. A non-conventional method was used to find the transimpedance gain, using microwave techniques

ASSUNTO(S)

comunicações oticas

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