JPH06149925A - Circuit simulator - Google Patents

Abstract

PURPOSE:To set convergent conditions for each parameter value by executing circuit simulation to a network list for analysis execution prepared by using convergent condition value data. CONSTITUTION:Parameter fluctuating value data 6 describing the range of parameter values on circuit diagram data 2 and the change width are set by using a parameter fluctuating value setting means 5, and convergent condition value data 13 describing circuit simulation convergent condition for each parameter are set from a convergent condition value setting means 12. Next, when parameter fluctuating simulation is executed, a network list 4 is extracted from the circuit diagram data 2 by a network list extracting means 3. A network list preparing means 14 prepares a network list 8 for analysis execution at a certain parameter value corresponding to the extracted network list 4, the parameter fluctuating value data 6 set by the parameter fluctuating value setting means 5 and the convergent condition value data 13 set by the convergent condition value setting means 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit simulation device for simulating a circuit operation of a circuit to be executed such as an electronic circuit.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a conventional circuit simulation apparatus. In the figure, 1 is a circuit diagram input means to which circuit diagram data of a circuit to be subjected to circuit simulation is input, and 2 is circuit diagram data input from the circuit diagram input means 1. Reference numeral 3 is a netlist extracting means for extracting a netlist from the circuit diagram data 2, and reference numeral 4 is a netlist extracted by the netlist extracting means 3. Reference numeral 5 is a variable fluctuation value setting means for setting variable fluctuation value data in which a range of variable values, a change width, etc. are described when a circuit simulation of a circuit to be executed is executed, and 6 is a variable fluctuation value. It is the variable variation value data set by the setting means 5.

An analysis execution netlist 7 for a certain variable value is created from the netlist 4 extracted by the netlist extracting means 3 and the variable variation value data 6 set by the variable variation value setting means 5. 8 is a netlist for executing analysis, which is created by the netlist creating means 7. Reference numeral 9 is a circuit simulation executing means for executing a circuit simulation for executing a circuit simulation on the analysis execution netlist 8, 10 is execution result data obtained by the circuit simulation by the circuit simulation executing means 9, and 11 is this execution result data. Execution result data 1
It is a result display means for displaying 0.

Next, the operation will be described. When the circuit diagram data 2 of the circuit to be subjected to the circuit simulation is input from the circuit diagram input means 1, the netlist extraction means 3
Extracts the netlist 4 from the circuit diagram data 2.
On the other hand, the variable variation value setting means 5 also sets the variable variation value data 6 describing the range of variable values and the variation width when the circuit simulation of the execution target circuit is executed. The netlist creating means 7 uses the netlist 4
An analysis execution netlist 8 for the value of a certain variable is created from the variable variation value data 6. The circuit simulation executing means 9 executes the circuit simulation on the created analysis execution netlist 8 and temporarily stores the execution result data 10. Hereinafter, this operation is repeated for the number of variable values in the variable variable value data 6, and when the circuit simulation for all variable values is completed, the stored execution result data 10 is displayed using the result display means 11. To do.

[0005]

Since the conventional circuit simulation apparatus is configured as described above, the convergence condition value cannot be changed for each variable value when the circuit simulation is executed, and the convergence condition depends on the variable value. In the case of a variable variation simulation that changes, it is difficult to make it converge, and since it is not possible to set the initial node voltage value for each variable value, there is a problem that it takes a lot of time for circuit design. .

The invention set forth in claim 1 has been made in order to solve the above problems, and an object thereof is to obtain a circuit simulation device capable of setting a convergence condition value of a circuit simulation for each variable value. To do.

Another object of the present invention is to provide a circuit simulation device capable of setting initial node voltage value data for each variable value.

[0008]

According to a first aspect of the present invention, there is provided a circuit simulation apparatus, wherein a circuit simulation convergence condition is set for each variable value in the variable fluctuation value data set by the variable fluctuation value setting means. The convergence condition value setting means for setting the convergence condition value data described above is provided, and the creation of the analysis execution netlist by the netlist creation means also uses the convergence condition value data set by the convergence condition value setting means. It is designed to be created.

In the circuit simulation apparatus according to the second aspect of the present invention, the initial node voltage value condition is described for each variable value in the variable fluctuation value data set by the variable fluctuation value setting means. Initial node voltage value setting means for setting the node voltage value data is provided, and the analysis execution netlist is created by the netlist creating means by using the initial node voltage value data set by the initial node voltage value setting means. It is designed to be created.

[0010]

The circuit simulation executing means according to the first aspect of the present invention executes the circuit simulation on the analysis execution netlist created also using the convergence condition value data set by the convergence condition value setting means. As a result, a circuit simulation device capable of setting a convergence condition for each variable value is realized.

Further, the circuit simulation executing means in the invention according to claim 2 is a circuit for the analysis execution netlist created also using the initial node voltage value data set by the initial node voltage value setting means. By executing the simulation, a circuit simulation device capable of setting the initial node voltage value for each variable value is realized.

[0012]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the invention described in claim 1. In the figure, 1 is circuit diagram input means, 2 is circuit diagram data, 3 is netlist extraction means, 4 is netlist, 5 is variable variation value setting means, 6 is variable variation value data, and 8 is an analysis execution netlist. , 9 is circuit simulation executing means, 10 is execution result data, and 11 is result displaying means, which are the same as or equivalent to those of the conventional one denoted by the same reference numeral in FIG.

Further, 12 is a convergence condition for setting convergence condition value data describing the convergence condition of the circuit simulation for each variable value in the variable fluctuation value data 6 set by the variable fluctuation value setting means 5. A value setting means 13 is convergence condition value data for each variable value set by the convergence condition value setting means 12. Reference numeral 14 indicates the convergence condition value set by the convergence condition value setting means 12 in addition to the netlist 4 extracted by the netlist extraction means 3 and the variable variation value data 6 set by the variation value setting means 5. This is a netlist creating means different from the conventional one by adding the reference numeral 7 in FIG. 5 in that the analysis execution netlist 8 is created for each variable value also using the data 13.

Next, the operation will be described. Here, FIG.
Is a flow chart showing the flow of the operation of the circuit simulation. First, the circuit diagram input means 1 inputs a circuit diagram of a circuit to be executed for circuit simulation, and circuit diagram data 2 is created (step ST1). Next, while using the variable variation value setting means 5 to set the variable variation value data 6 in which the variable value range on the circuit diagram data 2 and the variation width thereof are described (step ST2), the convergence condition value setting means is set. From 12, the convergence condition value data 13 describing the circuit simulation convergence condition for each variable is set (step ST3). Next, when a variable variation simulation is executed, the netlist 4 is extracted from the circuit diagram data 2 by the netlist extracting means 3 (step ST4).

The netlist creating means 14 extracts the netlist 4, the variable variation value data 6 set by the variable variation value setting means 5, and the convergence condition value data set by the convergence condition value setting means 12. From 13, the analysis execution netlist 8 for a certain variable value is created (step ST5). The circuit simulation executing means 9 executes the circuit simulation on the created analysis execution netlist 8 (step ST6), and temporarily stores the execution result data 10 obtained by executing the circuit simulation (step ST7). . Hereinafter, the operations of steps ST5 to ST7 are repeated by the number of variable values in the variable variation value data 6. When the circuit simulation for all the variable values is completed, the stored execution result data 10 is displayed by the result display means 11 (step ST8).

Example 2. Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a block diagram showing an embodiment of the invention stored in claim 2. The same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In the figure, 15 is an initial node voltage for setting initial node voltage value data describing an initial node voltage value condition for each variable value in the variable variable value data 6 set by the variable variable value setting means 5. Reference numeral 16 denotes a value setting means, which is initial node voltage value data for each variable value set by the initial node voltage value setting means 15. Reference numeral 17 denotes the initial node voltage set by the initial node voltage value setting means 15 in addition to the netlist 4 extracted by the netlist extraction means 3 and the variable variation value data 6 set by the variation value setting means 5. This is a netlist creating means different from that of the first embodiment with reference numeral 14 in FIG. 1 in that the analysis execution netlist 8 is created for each variable value also using the value data 16.

Next, the operation will be described. Here, FIG.
Is a flow chart showing the flow of the operation of the circuit simulation. Similar to the case of the first embodiment, first, the circuit diagram data of the execution target circuit is input from the circuit diagram input means 1 (step ST11), and the variable variation value data 6 is set by the variable variation value setting means 5 (step ST11). ST12).
Next, the initial node voltage value setting means 15 sets the initial node voltage value data 16 describing the initial node voltage value condition for each variable (step ST13). After that, the netlist extracting means 3 extracts the netlist 4 from the circuit diagram data 2 in the same manner as in the first embodiment (step ST14).

The netlist creating means 17 creates an analysis execution netlist 8 for one variable value based on the netlist 4, the variable variation value data 6 and the initial node voltage value data 16 (step). ST
15). Hereinafter, in the same manner as in the case of the first embodiment, the circuit simulation for the analysis execution netlist 8 is executed (step ST16), and the execution result data 1
0 is stored (step ST17), the work of steps ST15 to ST17 is repeated until the circuit simulation for all variable values is completed, and thereafter,
The stored execution result data 10 are displayed on the result display means 11 (step ST18).

[0019]

As described above, according to the invention described in claim 1, the convergence condition value setting means for setting the convergence condition value data for each variable value in the variable fluctuation value data is provided. Since the analysis execution netlist is created also using the convergence condition value data set in the convergence condition value setting means, it becomes possible to set the convergence condition for each variable value, and the time for circuit design is set. There is an effect that a circuit simulation device capable of shortening is obtained.

According to the second aspect of the invention, there is provided initial node voltage value setting means for setting initial node voltage value data for each variable value in the variable variable value data,
Since the analysis execution netlist is created also using the initial node voltage value data set by the initial node voltage value setting means, a circuit simulation device capable of shortening the time for circuit design is obtained. It is effective.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a circuit simulation device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of operations in the above embodiment.

FIG. 3 is a configuration diagram showing a circuit simulation device according to a second embodiment of the present invention.

FIG. 4 is a flowchart showing a flow of operations in the above embodiment.

FIG. 5 is a configuration diagram showing a conventional circuit simulation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit diagram input means 3 Netlist extraction means 5 Variable fluctuation value setting means 9 Circuit simulation execution means 11 Result display means 12 Convergence condition value setting means 14 Netlist creating means 15 Initial node voltage value setting means 17 Netlist creating means

Claims (2)

[Claims] 1. A circuit diagram input means for inputting circuit diagram data of a circuit to be subjected to circuit simulation, a net list extracting means for extracting a net list from the circuit diagram data input by the circuit diagram input means, and Variable fluctuation value setting means for setting variable fluctuation value data describing a variable value range and a fluctuation range when executing a circuit simulation of an execution target circuit, and for each variable value in the variable fluctuation value data Convergence condition value setting means for setting convergence condition value data describing the convergence condition of the circuit simulation, the netlist extracted by the netlist extracting means, and the variable fluctuation set by the variable fluctuation value setting means. Based on the value data and the convergence condition value data set by the convergence condition value setting means, an analysis execution netlist for each variable value is created. Netlist creation means to create,
A circuit simulation executing means for executing a circuit simulation on the analysis execution netlist created by the netlist creating means; and a result display means for displaying execution result data of the circuit simulation by the circuit simulation executing means. Circuit simulation device. 2. A circuit diagram input means for inputting circuit diagram data of a circuit to be subjected to circuit simulation, a net list extracting means for extracting a net list from the circuit diagram data input by the circuit diagram input means, and Variable fluctuation value setting means for setting variable fluctuation value data describing a variable value range and a fluctuation range when executing a circuit simulation of an execution target circuit, and for each variable value in the variable fluctuation value data The initial node voltage value setting means for setting the initial node voltage value data describing the initial node voltage value condition, the netlist extracted by the netlist extracting means, and the variable change value setting means are set. For executing the analysis for each variable value based on the variable value data and the initial node voltage value data set by the initial node voltage value setting means. Netlist creating means for creating a netlist, circuit simulation executing means for executing circuit simulation on the analysis execution netlist created by the netlist creating means, and execution of circuit simulation by the circuit simulation executing means A circuit simulation device comprising result display means for displaying result data.