Driver for high speed electrical-optical modulator interface

摘要

An electrical-optical modulator may function at high data rates and may be realized in comparably low cost silicon base technology, typically in BJT, BiCMOS or CMOS technologies. The output signal path may include a high transition frequency BJT and by using an active load constituted by a MOS driven by an inverted version of the modulating signal that drives the BJT, the falling edge of the output signal is sped up.

主权项

1. An electronic device comprising:
an electrical-optical (E-O) interface, said E-O interface comprising a coupling element; and a driver circuit configured to drive said coupling element and comprising
a power stage transistor comprising a control terminal configured to be driven by a modulating voltage signal, and a conduction terminal to be coupled to the coupling element of the E-O interface,a second transistor coupled in series with said power stage transistor and comprising a control terminal configured to be driven by an inverted replica of the modulating voltage signal,a load impedance coupled between said second transistor and a reference voltage, anda biasing circuit for said power stage transistor and coupled between said conduction terminal of said power stage transistor and the reference voltage.