US 6,147,533 A · Data communication receiving elements

Abstract

A data communication receiving element includes a photo-receiving element for receiving an external light signal and for converting the light signal to a current signal. It further includes an amplifier circuit for amplifying the current signal after converting the current signal to a voltage signal. A waveform shaping circuit is included for shaping an output voltage waveform from the amplifier circuit to a substantially square pulse. Finally, an integrator is included for converting the substantially square pulse to a non-square pulse. This is achieved by extending a rising time necessary for shifting the substantially square pulse from a low potential level to a high potential level, and by extending a falling time necessary for shifting the substantially square pulse from the high potential level to the low potential level. As such, deterioration of an S/N ratio is suppressed.

Claims16

Dependent claims

A data communication receiving element for receiving data via a light signal comprising:

a photo-receiving element for receiving the light signal and converting said light signal to a current signal;
amplifying means for amplifying said current signal after converting said current signal to a voltage signal;
waveform shaping means for shaping an output voltage waveform from said amplifying means to a substantially square pulse;
and
waveform changing means for changing said substantially square pulse to a non-square pulse for output, and suppressing deterioration of a signal to noise ratio of the data communication receiving element by extending a rising time of said substantially square pulse so as to gradually increase from a relatively low potential level to a relatively high potential level, and extending a falling time of said substantially square pulse so as to gradually decrease from the relatively high potential level to the relatively low potential level.

2 more elements

A data communication receiving element for receiving data vial a light signal comprising:

a photo-receiving element for receiving the light signal and converting said light signal to a current signal;
amplifying means for amplifying said current signal after converting said current signal to a voltage signal;
and
waveform shaping means for shaping an output voltage waveform from said amplifying means to a substantially square pulse, wherein
said waveform shaping means includes two output terminals for outputting said substantially square pulse;
and
anti-phase generating means for outputting said substantially square pulse received from one of said two output terminals after having inverted a phase of said substantially square pulse so as to suppress deterioration of a signal to noise ratio of the data communication receiving element.

4 more elements

Dependencies are inferred from the claim text.

Data communication receiving elements

Life of this patent

Data communication receiving elements

Life of this patent

Abstract

Claims16