Method, apparatus, and computer program for evaluating noise immunity of a semiconductor device
First Claim
1. A noise immunity evaluation design apparatus for evaluating noise immunity using a software simulation that represents a design of a circuit for a semiconductor device comprising:
- an acquiring unit, acquiring the software simulation, the software simulation including a simulated external noise source, a simulated external circuit, an impedance of a design power supplying circuit, an impedance of a design logic circuit, and an impedance of a design grounding circuit, the noise immunity evaluation apparatus further comprising;
a specifying unit, specifying a first frequency of a voltage generated by the noise source;
a calculating unit, calculating a first voltage directly across the design logic circuit impedance when a voltage of the specified first frequency is applied;
an outputting unit, outputting the specified first frequency and the calculated first voltage; and
an evaluation unit operable to output an evaluation of the noise immunity of the simulation circuit model, for the first frequency of a voltage generated by the noise source in comparison with a predetermined tolerance level for external noise where the evaluation is utilized to modify at least one of the impedances until the calculated first voltage falls within the predetermined tolerance level.
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Abstract
A method of evaluating noise immunity of a semiconductor device is provided. An actual circuit including the semiconductor device is represented by an equivalent circuit which has a target equivalent circuit, a noise source equivalent circuit, and an external equivalent circuit connected in parallel. The target equivalent circuit represents the semiconductor device. The noise source equivalent circuit represents a noise source outside the semiconductor device, and supplies noise to the target equivalent circuit. The external equivalent circuit represents a circuit outside the semiconductor device. The noise immunity is evaluated based on a voltage or current which arises in the target equivalent circuit by the noise. In this way, the immunity of the semiconductor device against extraneous noise can be evaluated in consideration of the effects of the circuitry outside the semiconductor device.
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Citations
15 Claims
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1. A noise immunity evaluation design apparatus for evaluating noise immunity using a software simulation that represents a design of a circuit for a semiconductor device comprising:
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an acquiring unit, acquiring the software simulation, the software simulation including a simulated external noise source, a simulated external circuit, an impedance of a design power supplying circuit, an impedance of a design logic circuit, and an impedance of a design grounding circuit, the noise immunity evaluation apparatus further comprising; a specifying unit, specifying a first frequency of a voltage generated by the noise source; a calculating unit, calculating a first voltage directly across the design logic circuit impedance when a voltage of the specified first frequency is applied; an outputting unit, outputting the specified first frequency and the calculated first voltage; and an evaluation unit operable to output an evaluation of the noise immunity of the simulation circuit model, for the first frequency of a voltage generated by the noise source in comparison with a predetermined tolerance level for external noise where the evaluation is utilized to modify at least one of the impedances until the calculated first voltage falls within the predetermined tolerance level. - View Dependent Claims (2, 3, 4, 13)
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5. A noise immunity evaluation method used in a noise immunity evaluation apparatus for evaluating noise immunity using a computer generated simulation model, the simulation model including a noise source, an impedance of a power supplying circuit, an impedance of a logic circuit, and an impedance of a grounding circuit, the noise immunity evaluation method comprising:
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a specifying step of specifying a frequency of a voltage generated by the noise source; a calculating step of calculating a first voltage arising directly across the logic circuit impedance when a voltage of the specified frequency is applied; an outputting step of outputting the specified frequency and the calculated first voltage, and an evaluation step to compare the specified frequency and the calculated first voltage with a predetermined tolerance level for external noise and output an indication whether the calculated first voltage falls within the tolerance level. - View Dependent Claims (6, 7, 8, 14)
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9. A program recording medium which is readable by a computer in a noise immunity evaluation apparatus for evaluating noise immunity using a simulation model, the simulation model including a noise source, an impedance of a power supplying circuit, an impedance of a logic circuit, and an impedance of a grounding circuit, wherein a computer program embodied on the program recording medium has the computer conduct:
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a specifing step of specifying a frequency of a voltage generated by the noise source; a calculating step of calculating a first voltage directly across the logic circuit impedance when a voltage of the specified frequency is applied; and an outputting step of outputting the specified frequency and the calculated first voltage. - View Dependent Claims (10, 11, 12, 15)
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Specification