INTEGRATED CIRCUIT AND NOISE MEASURING METHOD
An internal circuit generates a digital signal according to an electric signal received from outside, and outputs the digital signal to an output signal line. An output circuit sets a voltage value of the digital signal to a prescribed value. A drive signal input circuit inputs a drive signal received from outside through a drive signal input terminal to the output circuit, and drives the output circuit independent of the digital signal according to the drive signal.
1 . An integrated circuit comprising:
an input terminal to receive an electric signal from outside;
an internal circuit to generate a digital signal according to the electric signal, and to output the digital signal to an output signal line;
an output circuit to set a voltage value of the digital signal to a prescribed value;
a power supply line to supply power to the output circuit from a power supply terminal;
a drive signal input terminal to receive a drive signal from outside; and
a circuit to input the drive signal to the output circuit, and to drive the output circuit independent of the digital signal by using the drive signal.
2 . The integrated circuit according to claim 1 , further comprising a counter provided between the drive signal input terminal and the output circuit, and the counter to input a drive signal to at least one output circuit of a plurality of output circuits according to the drive signal from outside.
3 . The integrated circuit according to claim 1 , further comprising
an oscillation circuit to convert the drive signal into an oscillation signal, and to input the oscillation signal to the output circuit.
4 . The integrated circuit according to claim 1 , wherein
the drive signal input terminal receives the drive signal as light.
5 . The integrated circuit according to claim 1 , wherein
the drive signal input terminal receives the drive signal as a radio wave.
6 . The integrated circuit according to claim 1 , wherein:
the integrated circuit comprises a plurality of dies;
each die includes the internal circuit and the output circuit;
the power supply terminal is connected to each of the plurality of dies through a power supply line; and
the drive signal is input from the drive signal input terminal to each of the plurality of dies.
7 . An electronic device comprising:
an integrated circuit including:
an input terminal to receive an electric signal from outside;
an internal circuit to generate a digital signal according to the electric signal, and to output the digital signal to an output signal line;
an output circuit to set a voltage value of the digital signal to a prescribed value;
a power supply line to supply power to the output circuit from a power supply terminal;
a drive signal input terminal to receive a drive signal from outside; and
a circuit to input the drive signal to the output circuit, and to drive the output circuit independent of the digital signal by using the drive signal;
the external circuit; and
a power supply circuit to supply power to the integrated circuit and the external circuit.
8 . The electronic device according to claim 7 , wherein
the integrated circuit includes a counter provided between the drive signal input terminal and the output circuit, and the counter to input a drive signal to at least one output circuit of a plurality of output circuits according to the drive signal from outside.
9 . The electronic device according to claim 7 , further comprising
an optical signal reception unit to convert a received optical signal into the drive signal from outside, and to input the drive signal to the drive signal input terminal.
10 . A method for measuring electromagnetic interference of an integrated circuit, the method comprising:
supplying power to an output circuit for setting a voltage value of a digital signal input from an internal circuit to a prescribed value, through a power supply terminal of the integrated circuit;
receiving a drive signal from outside by a drive signal input terminal of the integrated circuit;
inputting the drive signal to the output circuit independent of an input signal of the digital signal; and
measuring the electromagnetic interference occurring in the integrated circuit.
11 . The method according to claim 10 , wherein
a counter provided between the drive signal input terminal and the output circuit inputs the drive signal to at least one output circuit of a plurality of output circuits according to the drive signal from outside.