发布时间 : 星期日 文章ltspice电子线路模拟教程 ()更新完毕开始阅读
1:在线路里每个节点自动编号.它在NETLIST 里.你可点VIEW下的SPICE NETLIST.有下图.
这就是以上电路的网表.每个元件一行,起点和终点和数值.
2: 你可把光标放在你要测的点,当它变为电笔时你可从左下角读出节点. 3:当你想看的图相太多时图窗各色的曲线太多这时,你可多开几个窗口.把光标放到黑底图表上,不是电路图.点鼠标.右键可出现一菜单.选Add Plot Pane.可开新的一窗口.
当鼠标对曲线图或电路图点左键时该窗边变为深蓝色.如果你按F5光标变剪刀.
你可剪掉你不要的东西.要去掉剪刀可按键盘上的.ESC 键.或右键. 3.4曲线颜色可变.先点曲线V[n005]名.用右键!!.Trace Color 里颜色即可.
3.5. 改变模拟时间.
这句表明从零开始到场25毫秒结束. 起始值一般为零. 下图为Q2集电极电压从零到50毫秒.
点放大镜可选你要从什么时间开始到什么时候为止,放大. 下图是从30 到.35毫秒. 点叉为恢复.
3.6. 细看电流,电压的曲线
1:用放大镜.看.下边.
2 b ) Switch from \
设纵向为0 到1.5V
2.1 把鼠标放在左边纵轴点右键出现一菜单见上图. 把Autoranging钩去掉用.选.Manual limits.
你可对水平和垂直轴给你要的单位. 垂直轴变了.0到.1.5V.
3.8. 求
曲线上的值.你可点曲线名.出现虚白交叉线.中点为所求的值.
你还可再你可点曲线名选第二条虚白交叉线 从俩虚白交叉线可看出数据的差异.
3.8一般来说压是对地.如果你想知某元件两端的电压差该如何呢. 设一参考点.先点小人.然后在电路图的.空白处点右键.找黑白电笔.Set probe reference.也可从VIEW找.
按键盘上ESC可去黑白电笔. 3.8. Current Measurements
Make the circuit diagram window active.(...by a left mouseclick on it....) and move the cursor exactly over thecomponent of which you want to know the current. The cursor changes to a \sensor\and with a leftmouseclick on the component you will see the trace current displayed in the waveform viewer..
Example:
Current in resistor R1 (Collector resistor of the left transistor, Q2):
3.9. Changing Component Values
Now we want to repeat the simulation with different component values. Let every capacitor be C = 1000pF andboth base resistors of the transistors R3 = R4 = 221( .
Close the Waveform Viewer (if it is open) and activate the schematic window. For each component place thecursor exactly on its value field (the cursor will change to an \Adialogue box will appear so you can modify the value. Close each change with OK.
This is the new circuit to be simulated....
....and this should be the simulation result after selecting the collector of Q2 to view the trace:
Use the zoom function or modify the simulation time to see the details or to measure the new
oscillationfrequency.