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    • 4. 发明专利
    • TERNARY SIGNAL DEVICE AND METHOD THEREFOR
    • JPH11112331A
    • 1999-04-23
    • JP14074898
    • 1998-05-22
    • SUN MICROSYSTEMS INC
    • GARNETT PAUL JEFFREY
    • H03K19/20H03M5/16H04L25/49
    • PROBLEM TO BE SOLVED: To provide improvement for providing many options or extended ternary encoding by performing the extended ternary decoding of a ternary input signal in response to the output signal from a window comparator output in both phases. SOLUTION: When a pin 12 has a low value L, the outputs B and A of 1st and 2nd comparators 16 and 18 have low values L, which are encoded by an encoder 24, so that an output X has a high value H and outputs Y and Z have low values L. Similarly, when the pin 12 has an intermediate value M, the outputs B and A have low and high values L and H, which are encoded by the encoder 24, so that the output Y has a high value H and the outputs X and Z have low values L. When the pin 12 has a high value H, on the other hand, the outputs B and A have high values H, which are encoded, so that the output Z has a high value H and the outputs X and Y have low values L. When the pin is open, resistances R1 and R2, and R3 to R5 for forcibly setting the pin to an intermediate value M are set equally to supply a reference voltage to the comparators 16 and 18.
    • 8. 发明专利
    • BIPOLAR CLOCK DISTURBANCE DETECTION CIRCUIT
    • JPH088752A
    • 1996-01-12
    • JP13276494
    • 1994-06-15
    • NEC CORP
    • TAKAHASHI YASUNORI
    • G06F1/04H03K5/19H03M5/16
    • PURPOSE:To make it possible to detect the abnormality of any bipolar clock by deciding that the bipolar clock is abnormal when the generation timing of detected violation is not matched with a prescribed timing pattern. CONSTITUTION:The outputs of positive and negative polarity pulse detection circuits 11 and 12 are inputted in a violation detection circuit 15 via a logical OR circuit 14. The circuit 15 detects the violation between the output signals SPLUS and SMINUS of the circuits 11 and 12 by defining a signal SCLOCK as a clock. When the output signal SOUT of the circuit 15 is inputted in a counter 16, a count-up is performed by synchronizing with the signal SCLOCK and the circuit 15 outputs the signal according to violation locations, a count value is reset. When an alarm detection circuit 17 monitors the count value of the counter 16 and the counter 16 is reset by a value which is different from that at a normal time, an alarm showing an abnormality is outputted when the reset is not performed in the timing that the violation should be generated.