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A Time-Discrete Format Switching Method Based on Unsmooth Waveform

A time-discrete and smooth technology, applied in instruments, complex mathematical operations, calculations, etc., to solve problems such as difficulty in finding accurate results

Active Publication Date: 2022-05-24
北京华大九天科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current processing scheme only assumes that the polishing process with the time step as the scale is done near the non-smooth point, and it is difficult to find accurate results

Method used

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  • A Time-Discrete Format Switching Method Based on Unsmooth Waveform
  • A Time-Discrete Format Switching Method Based on Unsmooth Waveform
  • A Time-Discrete Format Switching Method Based on Unsmooth Waveform

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] figure 1 For the flow chart of the time discrete format switching method based on the non-smooth waveform according to the present invention, the following will refer to figure 1 , a detailed description of the time-discrete format switching method based on a non-smooth waveform of the present invention.

[0027] In step 101, time-domain rough points in the simulation process are identified.

[0028] In the embodiment of the present invention, before processing the rough points, it is first necessary to identify the time-domain rough points in the simulation process. The present invention dynamically identifies the rough points in the simulation process by judging whether the simulation time point satisfies the following three conditions:

[0029] a) Determine the non-smooth point directly according to the non-smooth characteristic of the waveform of the component itself. For example, if the voltage source of the trapezoidal pulse is included in the network, the corne...

Embodiment 2

[0036] figure 2 It is a schematic diagram of the trapezoidal pulse waveform in the simulation process. If there is a circuit network such as figure 2 For the trapezoidal pulse voltage source shown, according to condition a), according to the non-smooth characteristics of the waveform, it can be figure 2 Points A, B, C, D shown in are marked as matte points.

Embodiment 3

[0038] If during simulation the waveform appears as image 3 Part of the waveform shown, the points A, B, and C shown in the figure will be marked as matte points. The determination of point A is determined by condition b), and the determination of points B and C is determined by condition c).

[0039] In addition, the method of the present invention for switching the time-discrete format for non-smooth waveforms is limited to solving the time-discrete method in the DAE for circuit time-domain simulation. Not suitable for time-discrete methods for solving other DAE problems or for other time-independent methods in DAEs for solving circuit time-domain simulations.

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Abstract

A time-discrete format switching method based on rough waveforms, comprising the following steps: 1) determining the time-domain rough points in the simulation process; 2) switching the time-discrete format to the implicit Euler format to calculate the next step of time-discrete. The time-discrete format switching method based on the rough waveform of the present invention can judge that the waveform is not smooth during the simulation process and switch the time-discrete format, thereby reducing the time-discrete error.

Description

technical field [0001] The invention relates to the technical field of time-domain simulation of EDA analog circuits, in particular to time-discrete format switching in time-domain simulation. Background technique [0002] In the time domain simulation of EDA analog circuits, it is necessary to time discretize the differential algebraic equations (DAE) obtained by modeling the circuit network. Common discrete formats include implicit Euler format, trapezoidal format, Gear format, etc., where Euler format is first-order precision, and trapezoidal format and Gear format are second-order precision. [0003] The accuracy of the above discrete scheme is only valid for the case where the solution is smooth, but in the actual circuit simulation process, it is necessary to deal with the non-smooth case. For example, for a voltage source of trapezoidal pulses, additional errors are introduced if the discretization is still performed in a high-precision format at the non-smooth infle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/367G06F17/13
CPCG06F30/367G06F17/13
Inventor 周振亚吴大可程明厚阳杰刘强
Owner 北京华大九天科技股份有限公司