淘宝官方店     推荐课程     在线工具     联系方式     关于我们  
 
 

微波射频仿真设计   Ansoft Designer 中文培训教程   |   HFSS视频培训教程套装

 

Agilent ADS 视频培训教程   |   CST微波工作室视频教程   |   AWR Microwave Office

          首页 >> Ansoft Designer >> Ansoft Designer在线帮助文档


Ansoft Designer / Ansys Designer 在线帮助文档:


Nexxim Simulator >
Nexxim Component Models >
Independent Sources >
   Current Source, Exponential (Netlist Only)       

Current Source, Exponential (Netlist Only)

 

Exponential Current Source Netlist Format

The format for specifying an exponential current source is:

Ixxxx n+ n- EXP (v1 v2 [td1 [td2 [t1 [t2]]]])

n+ is the positive node and n- is the negative node of the current source. Parameters in parentheses are positional. The first two (v1 and v2) are required. The remainder (td1, td2, t1, and t2) can be omitted, but the parameters must be entered in the order given. To guarantee that a given parameter is interpreted correctly, all parameters to the left of it must be present.

 

Note 

The exponential current source is available for use in netlists, but is not supported in the Components window of the Designer Schematic Editor.

 


Exponential Current Source Parameters

Parameter

Description

Unit

Default

v1

Initial current value

Amp

0.0

v2

Maximum current value

Amp

0.0

td1

(Positive) delay time to start of exponential rise

Second

0.0

td2

Delay time to start of exponential fall

Second

td1+TSTEP (step argument on TRAN statement)

t1

Rise time constant

Second

TSTEP

t2

Fall time constant

Second

TSTEP


Exponential Current Source Netlist Example

.TITLE IEXP TEST

I1 1 0 EXP(-4 -1 5ns 30ns 80ns 40ns)

R1 1 0 1

.TRAN 0.5ns 200ns

.PRINT tran I(R1)

.END

Notes

1. From time = 0 to time = td1:

Output = v1

From time=td1 to time = td2:

Output = v1+(v2-v1)´(1.0-EXP[-(time-td1)/t1]

From time = td2 to time = tstop:

Output = v1+(v2-v1)´(1.0-EXP[-(time-td1)/t1])-
(v2-v1)´(1.0-EXP[-(time-td2)/t2])

2. The td2, t1, and t2 parameters take their default values from the step argument on the transient analysis TRAN statement (see Transient Analysis Netlist Format). Therefore, when a circuit containing an exponential current source is to be analyzed with a tool other than transient analysis, the td2, t1, and t2 parameters must be given explicit values.

3. The exponential current source exhibits an 'overshoot' when the first time period is small relative to the first decay constant.

 

Here is the resulting waveform:




HFSS视频教学培训教程 ADS2011视频培训教程 CST微波工作室教程 Ansoft Designer 教程

                HFSS视频教程                                      ADS视频教程                               CST视频教程                           Ansoft Designer 中文教程


 

      Copyright © 2006 - 2013   微波EDA网, All Rights Reserved    业务联系:mweda@163.com