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在PSpice中，使用花括号{ }定义全局参数是必要的。电阻R1的值被变量{sweep}取代，全局参数可以表示数学表达式或变量，通过特殊库的PARAM部分进行定义。要定义全局变量，需要通过属性编辑器编辑PARAM部分添加新属性。可以通过调整视图以列形式显示，并添加允许全局参数扫描的新属性。创建新的仿真配置文件，选择DC Sweep分析类型，设置Sweep变量为全局参数，并定义其线性变化范围。
Parametric Sweep
The braces otherwise known as curly brackets { } are required in PSpice to define global parameters.
The value of resistor R1 has been replaced with a variable called {sweep};
A global parameter can represent a mathematical expression as well as a variable and is defined using the PARAM part from the Special library。
To define the global variable, you have to add a new property to the PARAM part by editing its properties via the Property Editor.
To change the view from rows to columns, place the cursor in the blank cell above the
Color property. When the cursor changes to an arrow,
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