Patent ID: 6414540
Filing Date: 2002-07-02
Classification: H03K,H04L

Abstract:
Input filter stage for filtering a data stream supplied via an input line, comprising:a register chain connected to the input line and has a plurality of series-connected registers; a switching device connected to an output line and to the register chain in order to switch the output line, the switching device comprising an AND gate, a NOR gate and a further register, the inputs of the AND gate and the NOR gate each being connected to the signal output of one of the plurality of registers, and the outputs of the AND gate and the NOR gate each being connected to inputs of the further register; a signal input of a first register in the register chain being connected to the input line, and a signal input of a subsequent register in the register chain being connected to a respective signal output of a preceding register in the register chain; a clock input for the plurality of registers being connected to a respective clock line which can be used to transmit a sampling signal at a sampling frequency, the sampling frequency being higher than a maximum data transmission frequency of the data stream, the switching device being connected to the register chain such that the output line can be switched to a logic level of the signal outputs of the plurality of registers when output signals which are produced at each of the signal outputs of the plurality of registers are at the same logic level.