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Time discrete format switching method based on unsmooth waveform

A time-discrete and smoothing technique, applied in special data processing applications, instruments, complex mathematical operations, etc., can solve problems such as difficult to find accurate results

Active Publication Date: 2021-08-13
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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  • Time discrete format switching method based on unsmooth waveform
  • Time discrete format switching method based on unsmooth waveform
  • Time discrete format switching method based on unsmooth waveform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] figure 1 It is a flow chart of the time-discrete format switching method based on rough waveforms according to the present invention, which will be referred to below figure 1 , the time-discrete format switching method based on the rough waveform of the present invention is described in detail.

[0027] In step 101, time domain non-smoothness 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 rough points in the simulation process by judging whether the simulation time point satisfies the following three conditions:

[0029] a) Determine the rough point directly according to the rough characteristics of the waveform of the component itself. For example, if the network contains a voltage source with trapezoidal pulses, the corner points of the trapezo...

Embodiment 2

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

Embodiment 3

[0038] If during the 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 judgment of point A is determined by condition b), and the judgment of points B and C is determined by condition c).

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

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Abstract

The invention discloses a time discrete format switching method based on an unsmooth waveform. The method comprises the following steps: 1) determining time domain unsmooth points in a simulation process; and 2) switching the time discretization format into an implicit Euler format to calculate the time discretization of the next step. According to the time discrete format switching method based on the unsmooth waveform, the situation that the waveform is unsmooth in the simulation process can be judged, the time discrete format is switched, and the time discrete error is reduced.

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 through circuit network modeling. Common discrete formats include implicit Euler format, trapezoidal format, and Gear format, among which the Euler format is the first-order precision, and the trapezoidal format and Gear format are second-order precision. [0003] The accuracy of the above discrete format is only valid for the case where the solution is smooth, but in the actual circuit simulation process, it needs to deal with the non-smooth case. For example, for a voltage source with trapezoidal pulses, additional errors will be introduced if discretization is still performed in a high-precision format at the non-...

Claims

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Application Information

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Patent Type & Authority Applications(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