Electric circuit evaluation method and electric circuit

Patent metadata

Field	Value
Publication number	US-9470735-B2
Application number	US-201414301509-A
Country	US
Kind code	B2
Filing date	Jun 11, 2014
Priority date	Jun 14, 2013
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

A noise signal for a malfunction test is inputted to a ground terminal, and a frequency property of the magnitude of the power at which a designated electric circuit causes a malfunction is found. A detection reference ground of a detection part for detecting malfunctions of the designated electric circuit is connected at high impedance to a ground of the targeted circuit. Differential input parts are provided to the detection part, a to-be-detected part of the designated electric circuit is connected to one differential input part, and the ground of the targeted circuit is connected to the other differential input part. A ground of a noise source is isolated from a ground of a power source circuit for supplying a power source to the designated electric circuit. The ground of the noise source is galvanically isolated from the ground of the designated electric circuit.

First claim

The invention claimed is:

1. An electric circuit evaluation method comprising the following step:
a step of inputting a noise signal for a malfunction test to a ground terminal of a designated electric circuit and finding a frequency property of the magnitude of the power at which the designated electric circuit causes a malfunction;
wherein a detection reference ground of a detection part for detecting whether or not the designated electric circuit causes a malfunction is connected at high impedance to a ground of the designated electric circuit.

2. The electric circuit evaluation method of claim 1 ;
the ground of the detection part and the ground of the targeted circuit being connected via a resistor.

3. The electric circuit evaluation method of claim 1 ;
the ground of the detection part and the ground of the targeted circuit being connected via a coil.

4. The electric circuit evaluation method of claim 1 ;
the ground of the detection part and the ground of the targeted circuit being connected via a ferrite bead.

5. The electric circuit evaluation method of claim 1 ;
the evaluation method for inputting the noise signal for a malfunction test to the designated electric circuit and finding the frequency property of the magnitude of the power at which the designated electric circuit causes a malfunction being compliant with DPI testing.

6. The electric circuit evaluation method of claim 1 ;
a ground of a noise source for inputting the noise signal for a malfunction test to the designated electric circuit being isolated from a ground of a power source circuit for supplying a power source to the designated electric circuit.

7. The electric circuit evaluation method of claim 1 ;
a ground of a noise source for inputting the noise signal for a malfunction test to the designated electric circuit being galvanically isolated from a ground of the designated electric circuit.

8. An electric circuit provided together with data pertaining to the frequency property obtained by the evaluation method of claim 1 .

9. An electric circuit evaluation method comprising the following step:
a step of inputting a noise signal for a malfunction test to a ground terminal of a designated electric circuit and finding a frequency property of the magnitude of the power at which the designated electric circuit causes a malfunction;
wherein a ground of a noise source for inputting the noise signal for a malfunction test to the designated electric circuit is galvanically isolated from a ground of the designated electric circuit.

10. An electric circuit evaluation method comprising the following step:
a step of inputting a noise signal for a malfunction test to a ground terminal of a designated electric circuit and finding a frequency property of the magnitude of the power at which the designated electric circuit causes a malfunction;
wherein a detection part for detecting whether or not the designated electric circuit causes a malfunction has differential input parts, a to-be-detected part of the designated electric circuit is connected to one differential input, and a ground of the targeted circuit is connected to the other differential input.

11. An electric circuit evaluation method comprising the following step:
a step of inputting a noise signal for a malfunction test to a ground terminal of a designated electric circuit and finding a frequency property of the magnitude of the power at which the designated electric circuit causes a malfunction;
wherein a ground of a noise source for inputting the noise signal for a malfunction test to the designated electric circuit is isolated from a ground of a power source circuit for supplying a power source to the designated electric circuit.

Assignees

• Rohm Co Ltd

Inventors

• Hiraga Noriaki

Classifications

• G01R31/2839

  using signal generators, power supplies or circuit analysers (G01R31/2879 takes precedence; multimeters G01R15/12, network analysers G01R27/28) · CPC title

• G01R31/002 Primary

  where the device under test is an electronic circuit · CPC title

• G01R31/2612

  for measuring frequency response characteristics, e.g. cut-off frequency thereof · CPC title

• G01R31/2805

  Bare printed circuit boards · CPC title

• G01R31/282

  Testing of electronic circuits specially adapted for particular applications not provided for elsewhere (G01R31/2801 and G01R31/2851 take precedence) · CPC title