JP2962284B2 - Electronic circuit analysis device, analysis method therefor, and storage medium storing program for causing a computer to process the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic circuit analyzing apparatus, an analyzing method thereof, and a storage medium storing a program for causing a computer to execute the method, and more particularly, to a storage medium generated by an electronic apparatus having a plurality of electronic circuits mounted thereon. The present invention relates to an electronic circuit analysis device for analyzing noise, a method for analyzing the same, and a storage medium storing a program for causing a computer to process the method.

[0002]

2. Description of the Related Art FIG. 8 is a diagram for explaining a method for analyzing noise generated from a conventional electronic device of this kind. Referring to FIG. 8, there is shown an example of an electronic device in which each of the electronic circuits 1 to 4 and 5 is interconnected via a bus type connection circuit 6.

The electronic circuit 4 has a clock generating function. The generated clock is input to the electronic circuit 5 via the bus-type connection circuit 6, and the electronic circuit 5 has a clock distribution function. The electronic circuits 1 to 3 are distributed to the electronic circuits 1 to 3 and the like via the bus-type connection circuit 6 so that the electronic circuits 1 to 3 can be synchronized with each other.

When analyzing electromagnetic noise generated from such an electronic device, a method is generally known in which a ^2K- type orthogonal table is used and each electronic circuit is assigned to this orthogonal table. .

In this case, as shown in FIG. 9, each of the electronic circuits 1-4 shown in FIG. 8 is attached to and detached from an electronic circuit (electronic device package) insertion slot 16 provided in a housing 15 of the electronic device. Measurement and analysis processing is performed.

[0006] Examples of a circuit analysis device using an orthogonal table are disclosed in JP-A-3-59762 and JP-A-3-483.
No. 03 and JP-A-7-325804.

[0007]

In the conventional method shown in FIGS. 8 and 9, it is necessary to attach and detach the package, and the attachment and detachment of the package changes the distribution of the electromagnetic field and causes the electromagnetic field in a state close to the actual use state. There is a disadvantage that evaluation is difficult.

Further, if the number of electronic equipment packages increases, it is difficult to insert and remove the packages according to the experiment plan table, and if the number of experiments is reduced to reduce the number of steps, a large error occurs. Further, in the case where the circuit shown in FIG. 8 is constituted by one or more semiconductor circuits, there is a problem that appropriate connection with peripheral circuits is required and the circuit cannot be easily attached / detached.

The above-mentioned drawbacks have not been solved by the analysis methods presented in the above publications.

[0010] An object of the present invention is to automatically determine an analysis method and perform experiments with a small number of experiments and in an appropriate combination.
An electronic circuit analysis apparatus and an analysis method capable of extracting characteristics of individual electronic circuits as parameters such as a main effect, a degree of contribution, and interaction, and obtaining an optimal combination in consideration of characteristics of the entire circuit by parameter estimation. Another object of the present invention is to provide a storage medium storing a program for causing a computer to execute the method.

[0011]

According to the present invention, there is provided an electronic circuit analyzing apparatus for performing noise analysis in an electronic device having a plurality of electronic circuits mounted thereon, wherein the electronic circuits are interconnected. Bus type connecting means for connecting the electronic circuit to a bus of the connecting means, a switch means having a switch provided corresponding to these electronic circuits for turning on / off the electronic circuit, and presence / absence of mounting of each of the electronic circuits a detecting means for detecting, said the experimental design table creating means for creating an experimental plan table is orthogonal array of 2 ^K type according to the detection result by the detection unit, while allocating each of each of said electronic circuit to the experimental design table the Control means for performing on / off control of each of the corresponding switches in accordance with an experiment plan table, and measuring means for measuring a characteristic value of the electronic circuit during the on / off control Main effect by analyzing the characteristic value,
Means for determining a contribution rate and an interaction.

Further, according to the present invention, a plurality of electronic circuits are mounted and these electronic circuits are interconnected by a bus-type connecting means, and the on / off connection of the electronic circuit to the bus of the connecting means corresponds to these electronic circuits. an electronic circuit analyzing method for making a noise analysis in controllable electronic device by a switch provided in the steps of detecting the presence or absence of implementation of the electronic circuit respectively, orthogonal array of 2 ^K type according to the detection result Creating an experiment plan table, and allocating each of the electronic circuits to the experiment plan table, and performing on / off control of each of the corresponding switches according to the experiment plan table; and Measuring a characteristic value of the electronic circuit, and analyzing the characteristic value to obtain a main effect, a contribution rate, and an interaction; Electronic circuit analysis method which comprises obtained.

Further, according to the present invention, a plurality of electronic circuits are mounted and these electronic circuits are interconnected by a bus-type connecting means, and the on / off of the connection of the electronic circuit to the bus of the connecting means corresponds to these electronic circuits. A storage medium storing a program for causing a computer to execute an electronic circuit analysis method for performing a noise analysis in an electronic device controllable by a switch provided in the electronic device, and detecting whether or not each of the electronic circuits is mounted. steps and, the steps of creating a an orthogonal array of 2 ^K-type experimental design table in accordance with the detection result, of each of said switches corresponding in accordance with the experimental design table while allocating each of each of said electronic circuit to the experimental design table Performing an on-off control, and measuring a characteristic value of the electronic circuit during the on-off control; Serial characteristic value by analyzing the main effects, and the storage medium storing the program and determining the contribution ratio and interaction is obtained.

The operation of the present invention will be described. By automatically detecting the bus connection state of the electronic circuit and automatically performing the assignment processing and the analysis processing based on the experimental design method according to the detection result, the operator can change the state of the electronic circuit (removal state). Eliminates the need for manual changes or assignments by experimental design.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, and the same parts as those in FIG. 8 are denoted by the same reference numerals. Also in FIG. 1, the electronic circuits 1 to 5 are interconnected via a bus-type connection circuit 6, and in this example, switches 71 to 74 are provided corresponding to the electronic circuits 1 to 4, respectively. By performing the on / off control of the switches 71 to 74, the electronic circuits 1 to 4 can freely turn on and off the connection to the bus type connection circuit 6.

A switch circuit 7 is constituted by these switches 71 to 74, and this switch circuit 7 is assumed to be incorporated in the bus type connection circuit 6. This bus-type connection circuit 6 is provided on the back panel of the housing 15 as shown in FIG. 9, and each electronic circuit is inserted (mounted) into each corresponding slot 16 of the housing 15.

It is assumed that the bus type connection circuit 6 also has a wiring pattern for a communication circuit and a power supply circuit necessary for the operation of the electronic equipment packages (electronic circuits) 1 to 5 together with the switch circuit 7.

The detecting device 8 detects whether each of the electronic circuits 1 to 4 is mounted in each slot of the housing, and the result of the detection is supplied to the analyzing device 10.

The analysis device 10 automatically creates an experiment plan table which is an orthogonal table according to the detection result of the detection device 8, and controls the switch control device 9 by allocating each electronic circuit to this experiment plan table. On / off control of each of the switches 71 to 74 of the switch circuit 7 is performed.

The noise measuring device 12 measures the electromagnetic noise associated with the switch on / off control via the probe 11 and supplies the measurement result to the analyzing device 10. The storage medium 13 stores the analysis processing means of the analysis device 10 in the form of a program in advance, and the analysis processing automatically proceeds according to the program procedure.

FIG. 2 is a flowchart showing this analysis processing procedure. Referring to FIG. 2, the detection device 8 detects whether or not an electronic circuit is mounted (step 101). The detection device 8 is provided on the bus-type connection circuit 6, and when the electronic device package is mounted, the detection device 8 detects the voltage change or the like. Although various detection circuits can be devised, the simplest one is a circuit shown in FIG. When the electronic device package is mounted, the circuit on the side of the bus type connection circuit 6 which has been opened becomes a closed circuit, and power is consumed by the resistor R on the electronic device package side, and current flows. Therefore, if a change in current is detected by the detection circuit via the bus-type connection circuit, it is possible to detect whether or not the electronic device package is mounted.

[0023] Then, Keru dividing the orthogonal array of suitable 2 ^K-type to the analysis of this such packages orthogonal array processing 104 allocates each electronics package selected in step 102. In FIG. 1, since electronic device packages 1 to 4 are detected, these four packages are shown in FIG.
In the orthogonal table. This allocation method is shown in FIG.
This is done in consideration of the interrelationship between the allocated column numbers called the dotted line diagram shown in FIG. This usually involves a different allocation process depending on past experiences and analysis targets, which is one know-how. Such know-how constitutes a single referenceable rule base 103.
02 and allocation processing 104.

In the measurement process 105, each switch of the switch circuit 7 is operated by the switch control device 9 in accordance with the allocation in the allocation process 104, and the measurement is performed in accordance with the orthogonal table.
That is, the combination of the orthogonal tables is realized by operating this switch.

Now, it is assumed that the electronic device packages 1, 2, 3, and 4 are assigned to A, B, D, and H in the orthogonal table, respectively. First
The second experiment was performed with experiment number NO. Switch 1 with reference to 1
This is done by setting 2, 3, and 4. Turn on 1 in the table,
2 corresponds to the state of OFF, the switch 1
2, 3, and 4 are ON, ON, ON, and ON. The second experiment was performed with experiment number NO. 2, the switches 1, 2, 3, and 4 are set to ON, ON, ON, and OFF. Hereafter NO. Up to 16 experiments are performed 16 times.

The measurement is performed by the noise measuring device 12,
When measuring radiation noise, a standard measuring device using a loop antenna or the like is used. FIG. 5 shows an example in which the probe 11 is used, and radiation noise is measured on the front of the electronic device. The radiated noise is the total amount of radiated noise from each electronic circuit (interface circuit, clock circuit, clock distribution circuit, etc.), and the amount of noise increases or decreases depending on the combination of these electronic circuits.

The measured data is input to the analyzer 10 and analyzed for variance (step 106), and the main effect, contribution, and interaction are calculated. As an example of the operation of the analysis of variance in this case, a method of analysis of variance that is generally used can be cited. This technique is also described in the "Introduction to Experimental Design Method" published by the Japan Society for Science and Technology, which is the most authoritative in Japan. The main effect, contribution, and interaction are output as a result of analysis of variance, and are commonly used in the field of statistical analysis.

The parameter estimating process 107 is a process for estimating the amount of noise using the main effect and the interaction.
FIG. 6 is a diagram illustrating parameter estimation. By the analysis of variance, it can be decomposed into factors corresponding to each column of the orthogonal table of L16 as shown in FIG. FIG. 6B shows a result obtained by extracting only factors having a large value (dominant factors) from the results of the analysis of variance and adding them together. The electric field strength is estimated for each frequency corresponding to each channel of the television. . Although the measured values are also shown in the figure for comparison, the estimated values and the measured values match well, and the effectiveness of parameter estimation can be understood.

A process 108 for comparing the contribution, interaction and the database 109 to determine whether sufficient repeated measurements have been performed.
Is determined. If necessary, the electronic circuit is reallocated (step 110), and the measurement is performed again. In general, if the assignment is poor, the contributions of all factors are determined to be errors, and all the parameter estimation results become invalid. Therefore, an operation called error pooling is performed from the list of contribution degrees to determine an error.
If the determination result is bad, reassignment is performed by referring to the magnitude of the interaction so that the interaction can be accurately extracted. This is to improve the reliability of the analysis result.

It is necessary to estimate the effect of setting the parameter estimation result (in this case, the estimated value of the noise amount measured by the noise measuring device) to a desired value. For this purpose, the measurer can set a target value in the target value setting 112. In the case of unnecessary noise, it is necessary to make the value as small as possible, so that the desired characteristic is obtained.

Then, the magnitudes of the characteristic values whose parameters are estimated are compared (step 111), and the order of the most desirable characteristics is performed in the priority generation processing (step 113). Output the combination. As an example, FIG. 7 shows estimated values in a combination of electronic device packages. In this example, it can be seen that the electric field strength is higher in the order of the combination numbers 3, 2, and 1. In this case, it is desirable that the electric field strength is small. Therefore, the results of the dispersion analysis of the electronic device packages 1 and 2 are checked to take measures against dominant factors.

By outputting the result, it can be used as information for the electronic circuit designer to determine the priority when designing the circuit and mounting.

The electronic device circuit can be replaced with a circuit module or a semiconductor internal circuit mounted on a printed circuit board.

[0034]

According to the present invention, it is possible to quantitatively extract the main effect and contribution of each electronic device panel in the overall noise radiation and the interaction between the panels, and it is easy to search for a noise source. In the conventional method, there is a possibility that a large error may occur especially in the extraction of the interaction.However, in this method, the parameter is extracted experimentally, and the repeated experiment is performed with reference to the database. It is possible to hold down.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a diagram illustrating an example of the detection device of FIG. 1;

FIG. 4A is a diagram showing an example of an orthogonal table used in the embodiment of the present invention, and FIG. 4B is a diagram showing an example of a dotted line diagram for creating the orthogonal table.

FIG. 5 is a diagram illustrating an example of the noise measuring device of FIG. 1;

FIG. 6A is a diagram showing a result of analysis of variance, and FIG. 6B is a diagram showing parameter estimation values.

FIG. 7 is a diagram illustrating an example of estimation based on a combination of electronic device packages.

FIG. 8 is a diagram illustrating a conventional noise measurement technique.

FIG. 9 is a diagram illustrating a physical relationship between a housing of an electronic device and an electronic device package.

[Explanation of symbols]

 1-5 Electronic Circuit (Electronic Equipment Package) 6 Bus-Type Connection Circuit 7 Switch Circuit 8 Detecting Device 9 Switch Control Device 10 Analyzing Device 11 Probe 12 Noise Measuring Device 13 Storage Medium

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G06F 11/22-11/26 G01R 31/28-31/30 G01R 29/08

Claims (6)

(57) [Claims] 1. An electronic circuit analysis device for performing noise analysis in an electronic device configured by mounting a plurality of electronic circuits, comprising: a bus-type connection unit for interconnecting the electronic circuits; Switch means having switches provided corresponding to these electronic circuits for turning on and off the connection of the electronic circuits to the bus of the connection means; detecting means for detecting whether or not each of the electronic circuits is mounted; and the detecting means each of said switches corresponding in accordance with the experimental design table while allocation respectively and experimental design table creation means for creating an orthogonal table 2 ^K-type experimental design table according to the detection result, each of the electronic circuit to the experimental design table by Control means for performing on / off control of the electronic circuit; measuring means for measuring a characteristic value of the electronic circuit at the time of the on / off control; And a means for determining a contribution rate and an interaction. 2. The electronic circuit analysis apparatus according to claim 1, further comprising means for estimating a characteristic value based on a combination of unknown electronic circuits using the main effect, the contribution ratio, and the interaction. 3. The method further comprises: a database in which a method of allocating to the experiment plan table is stored in advance, and means for reallocating the experiment plan table with reference to the database.
3. The electronic circuit analyzer according to claim 2, wherein the characteristic value is measured by a plurality of allocation methods. 4. A means for setting a target value of the characteristic value and a condition of a combination of the electronic circuits, and calculating a target value under a condition of the combination of the electronic circuits from a calculated value of a plurality of characteristic values. And means for outputting a combination of electronic circuits according to the magnitude of the characteristic value.
The electronic circuit analyzer according to the above. 5. A switch in which a plurality of electronic circuits are mounted and these electronic circuits are interconnected by a bus-type connection means, and a switch provided for the electronic circuits to turn on / off the connection of the electronic circuit to the bus of the connection means. an electronic circuit analyzing method comprising the steps of detecting the presence or absence of implementation of the electronic circuit each, experimental design table is orthogonal array of 2 ^K type according to the detection result to make the noise analysis in controllable electronic device by Creating each of the electronic circuits, and performing on / off control of each of the corresponding switches in accordance with the experiment plan table while allocating each of the electronic circuits to the experiment plan table. And a step of analyzing the characteristic value to obtain a main effect, a contribution rate, and an interaction. Electronic circuit analysis method to be. 6. A switch provided with a plurality of electronic circuits, which are interconnected by a bus-type connecting means, and wherein the on / off connection of the electronic circuit to the bus of the connecting means is provided for the electronic circuits. A storage medium storing a program for causing a computer to execute an electronic circuit analysis method for performing noise analysis in an electronic device controllable by a computer, comprising: detecting whether or not each of the electronic circuits is mounted; and creating an experimental plan table is orthogonal array of 2 ^K type according to the results, the step of forming the on-off control of each of said switches corresponding in accordance with the experimental design table while allocating each of each of said electronic circuit to the experimental design table Measuring the characteristic value of the electronic circuit during the on / off control; and analyzing the characteristic value. Main effect, storage medium storing a program comprising determining a contribution ratio and interaction, the Te.