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US 8,948,299 B2Granted
Pulse converting and shaping communication device
AssigneeFujitsu Limited
InventorsYasuhiro Nakasha, Hiroki Hayashi, Takumi Itoh
Life of this patent
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Abstract
A communication device includes: a converting part converting a data signal from a non-return-to-zero signal to a return-to-zero signal; a trigger flip-flop inverting an output signal every time the return-to-zero signal changes in one cycle; a first filter outputting a positive pulse and a negative pulse alternately, which indicate existence and absence of the pulse corresponding to a value of the data signal, by removing a low frequency component of an output signal of the trigger flip-flop.
Claims9
A communication device comprising:
- a converting part that converts a data signal from a non-return-to-zero signal into a return-to-zero signal;
- a trigger flip-flop that inverts an output signal every time the return-to-zero signal changes in one cycle;
- a first filter that outputs a positive pulse and a negative pulse alternately, which indicate existence and absence of the pulse corresponding to a value of the data signal;
- and
- an edge shaping circuit that steepens an edge of the output signal of the trigger flip-flop circuit and outputs to the first filter,
- wherein the first filter removes a low frequency component of the output signal of the edge shaping circuit.
3 more elements
Dependencies are inferred from the claim text.