| 摘要 |
PURPOSE:To obtain a CMI code output without any whisker-like pulse by forming a double frequency clock with simple constitution from a signal retarding a clock input and the original clock signal. CONSTITUTION:A Q output of a FF 7 and a Q output of a FF 5 are inputted to a gate circuit G6, which encodes a level '1' at a terminal IN into '00', '11' alternately. A gate circuit G4 outputs a code '01' when the level of a terminal IN is logical 0. A gate circuit G3 outputs a coded '10' to a request of the violation of code rules. A gate circuit G5 synthesizes outputs of the circuits G4 and G3 and encodes the signal '01' for a signal '0' at the terminal IN and the signal '10' for a signal '0' at a terminal CRV. The output of the circuit G6 and the Q output of a FF 6 are synthesized by a gate circuit G7. A CMI code output is obtained from an output terminal OUT. Thus, a CMI code output having no whisker-like pulse is obtained.
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