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当前位置：服务支持 >  软件文章 >  HFSS脚本集成电路设计(1)：简单片上电感建模与仿真

HFSS脚本集成电路设计(1)：简单片上电感建模与仿真

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【简介】HFSS在射频集成电路设计起到了至关重要的作用，堪称射频集成电路工程师的左膀右臂。

HFSS支持基于Python语言的脚本[1]。如能熟练使用脚本，我们就能避免大量的、重复性的绘图工作，并实现电磁结构设计与仿真的自动化。本文，作者将以简单片上电感为例，介绍HFSS脚本中的常见代码。

之后，作者会陆续发布系列文章，讨论HFSS脚本如何在芯片自动化设计中发挥作用。

1. 准备工作

  • 创建一个空白的Python脚本 文件“demo.py”和空白HFSS工程文件“tutorial.aedt”
  • 打开hfss文件后，Tools --> Run Script 即可运行Python脚本

2. 电感与芯片层结构

  • 下述脚本会自动生成一个如下图所示的片上电感(介质层未标出)，并完成端口设置
  • 电感几何参数如下：
变量名 数值
L 100 um
Lg 20 um
W 6 um
D 10 um
  • 芯片介质层结构

3. 代码实现

在demo.py中依次输入下列代码

3.1 导入脚本环境

  • 选中当前工程"tutorial"
import ScriptEnv
ScriptEnv.Initialize("Ansoft.ElectronicsDesktop")
oDesktop.RestoreWindow()
oProject = oDesktop.SetActiveProject("tutorial")

3.2 新建HFSS设计

  • 当前工程下，新建设计“Design1”
  • 求解模式设为“DrivenModal”
oProject.InsertDesign("HFSS", "Design1", "DrivenModal", "")
  • 默认单位(Units)设置为“um”
oDesign = oProject.SetActiveDesign("Design1")
oEditor = oDesign.SetActiveEditor("3D Modeler")
oEditor.SetModelUnits(
	[
		"NAME:Units Parameter",
		"Units:="		, "um",
		"Rescale:="		, False
	])

3.3 新建空气盒子

  • 命名为“Airbox”
  • 尺寸定为6x6x6 cm^3，居中
  • 完全透明，即（Transparency=1）
oEditor = oDesign.SetActiveEditor("3D Modeler")
oEditor.CreateBox(
	[
		"NAME:BoxParameters",
		"XPosition:="		, "3cm",
		"YPosition:="		, "3cm",
		"ZPosition:="		, "3cm",
		"XSize:="		, "-6cm",
		"YSize:="		, "-6cm",
		"ZSize:="		, "-6cm"
	], 
	[
		"NAME:Attributes",
		"Name:="		, "Airbox",
		"Flags:="		, "",
		"Color:="		, "(143 175 143)",
		"Transparency:="	, 1,
		"PartCoordinateSystem:=", "Global",
		"UDMId:="		, "",
		"MaterialValue:="	, "\"vacuum\"",
		"SurfaceMaterialValue:=", "\"\"",
		"SolveInside:="		, True,
		"ShellElement:="	, False,
		"ShellElementThickness:=", "0mm",
		"IsMaterialEditable:="	, True,
		"UseMaterialAppearance:=", False,
		"IsLightweight:="	, False
	])
  • 将空气盒子的材料设置成“Air”
oEditor = oDesign.SetActiveEditor("3D Modeler")
oEditor.AssignMaterial(
	[
		"NAME:Selections",
		"AllowRegionDependentPartSelectionForPMLCreation:=", True,
		"AllowRegionSelectionForPMLCreation:=", True,
		"Selections:="		, "Airbox"
	], 
	[
		"NAME:Attributes",
		"MaterialValue:="	, "\"air\"",
		"SolveInside:="		, True,
		"ShellElement:="	, False,
		"ShellElementThickness:=", "nan ",
		"IsMaterialEditable:="	, True,
		"UseMaterialAppearance:=", False,
		"IsLightweight:="	, False
	])
  • 附加辐射边界条件
oModule = oDesign.GetModule("BoundarySetup")
oModule.AssignRadiation(
	[
		"NAME:Rad1",
		"Objects:="		, ["Airbox"],
		"IsFssReference:="	, False,
		"IsForPML:="		, False
	])

3.4 介质层建模

oDefinitionManager = oProject.GetDefinitionManager()
oDefinitionManager.AddMaterial(
	[
		"NAME:silicon_bulk",
		"CoordinateSystemType:=", "Cartesian",
		"BulkOrSurfaceType:="	, 1,
		[
			"NAME:PhysicsTypes",
			"set:="			, ["Electromagnetic"]
		],
		"permittivity:="	, "11.7",
		"conductivity:="	, "0.02"
	])

oDefinitionManager.AddMaterial(
	[
		"NAME:silicon_dioxide_pro",
		"CoordinateSystemType:=", "Cartesian",
		"BulkOrSurfaceType:="	, 1,
		[
			"NAME:PhysicsTypes",
			"set:="			, ["Electromagnetic"]
		],
		"permittivity:="	, "4.0",
		"conductivity:="	, "0.00"
	])
oEditor = oDesign.SetActiveEditor("3D Modeler")
oEditor.CreateBox(
	[
		"NAME:BoxParameters",
		"XPosition:="		, "0.5mm",
		"YPosition:="		, "0.5mm",
		"ZPosition:="		, "0cm",
		"XSize:="		, "-1mm",
		"YSize:="		, "-1mm",
		"ZSize:="		, "300um"
	], 
	[
		"NAME:Attributes",
		"Name:="		, "Silicon_bulk",
		"Flags:="		, "",
		"Color:="		, "(143 175 143)",
		"Transparency:="	, 1,
		"PartCoordinateSystem:=", "Global",
		"UDMId:="		, "",
		"MaterialValue:="	, "\"silicon_bulk\"",
		"SurfaceMaterialValue:=", "\"\"",
		"SolveInside:="		, True,
		"ShellElement:="	, False,
		"ShellElementThickness:=", "0mm",
		"IsMaterialEditable:="	, True,
		"UseMaterialAppearance:=", False,
		"IsLightweight:="	, False
	])

oEditor.CreateBox(
	[
		"NAME:BoxParameters",
		"XPosition:="		, "0.5mm",
		"YPosition:="		, "0.5mm",
		"ZPosition:="		, "300um",
		"XSize:="		, "-1mm",
		"YSize:="		, "-1mm",
		"ZSize:="		, "10.8um"
	], 
	[
		"NAME:Attributes",
		"Name:="		, "Silicon_dioxide",
		"Flags:="		, "",
		"Color:="		, "(143 175 143)",
		"Transparency:="	, 1,
		"PartCoordinateSystem:=", "Global",
		"UDMId:="		, "",
		"MaterialValue:="	, "\"silicon_dioxide_pro\"",
		"SurfaceMaterialValue:=", "\"\"",
		"SolveInside:="		, True,
		"ShellElement:="	, False,
		"ShellElementThickness:=", "0mm",
		"IsMaterialEditable:="	, True,
		"UseMaterialAppearance:=", False,
		"IsLightweight:="	, False
	])

oEditor.CreateBox(
	[
		"NAME:BoxParameters",
		"XPosition:="		, "0.5mm",
		"YPosition:="		, "0.5mm",
		"ZPosition:="		, "310.8um",
		"XSize:="		, "-1mm",
		"YSize:="		, "-1mm",
		"ZSize:="		, "0.6um"
	], 
	[
		"NAME:Attributes",
		"Name:="		, "Protect_layer",
		"Flags:="		, "",
		"Color:="		, "(143 175 143)",
		"Transparency:="	, 1,
		"PartCoordinateSystem:=", "Global",
		"UDMId:="		, "",
		"MaterialValue:="	, "\"silicon_nitrate\"",
		"SurfaceMaterialValue:=", "\"\"",
		"SolveInside:="		, True,
		"ShellElement:="	, False,
		"ShellElementThickness:=", "0mm",
		"IsMaterialEditable:="	, True,
		"UseMaterialAppearance:=", False,
		"IsLightweight:="	, False
	])

3.5 片上电感建模

  • 根据层级结构，黄色金属层距离硅衬底为6um。为方便绘图，我们建立相对坐标系“IND”
oEditor.CreateRelativeCS(
	[
		"NAME:RelativeCSParameters",
		"Mode:="		, "Axis/Position",
		"OriginX:="		, "0um",
		"OriginY:="		, "0um",
		"OriginZ:="		, "306um",
		"XAxisXvec:="		, "1um",
		"XAxisYvec:="		, "0um",
		"XAxisZvec:="		, "0um",
		"YAxisXvec:="		, "0um",
		"YAxisYvec:="		, "1um",
		"YAxisZvec:="		, "0um"
	], 
	[
		"NAME:Attributes",
		"Name:="		, "IND"
	])
  • 并从Global坐标系，切换到此坐标系
oEditor.SetWCS(
	[
		"NAME:SetWCS Parameter",
		"Working Coordinate System:=", "IND",
		"RegionDepCSOk:="	, False
	])
  • 新建电感设计参数L，W, D, Lg
oDesign.ChangeProperty(
	[
		"NAME:AllTabs",
		[
			"NAME:LocalVariableTab",
			[
				"NAME:PropServers", 
				"LocalVariables"
			],
			[
				"NAME:NewProps",
				[
					"NAME:L",
					"PropType:="		, "VariableProp",
					"UserDef:="		, True,
					"Value:="		, "100um"
				],
				[
					"NAME:W",
					"PropType:="		, "VariableProp",
					"UserDef:="		, True,
					"Value:="		, "6um"
				],
                                [
					"NAME:D",
					"PropType:="		, "VariableProp",
					"UserDef:="		, True,
					"Value:="		, "10um"
				]，
				[
					"NAME:Lg",
					"PropType:="		, "VariableProp",
					"UserDef:="		, True,
					"Value:="		, "20um"
				]
			]
		]
	])
  • 电感建模
oEditor.CreateBox(
	[
		"NAME:BoxParameters",
		"XPosition:="		, "L/2+W/2",
		"YPosition:="		, "L/2+W/2",
		"ZPosition:="		, "0",
		"XSize:="		, "-L-W",
		"YSize:="		, "-L-W",
		"ZSize:="		, "3um"
	], 
	[
		"NAME:Attributes",
		"Name:="		, "BOX1",
		"Flags:="		, "",
		"Color:="		, "(255 128 0)",
		"Transparency:="	, 0,
		"PartCoordinateSystem:=", "Global",
		"UDMId:="		, "",
		"MaterialValue:="	, "\"aluminum\"",
		"SurfaceMaterialValue:=", "\"\"",
		"SolveInside:="		, False,
		"ShellElement:="	, False,
		"ShellElementThickness:=", "0mm",
		"IsMaterialEditable:="	, True,
		"UseMaterialAppearance:=", False,
		"IsLightweight:="	, False
	])

oEditor.CreateBox(
	[
		"NAME:BoxParameters",
		"XPosition:="		, "L/2-W/2",
		"YPosition:="		, "L/2-W/2",
		"ZPosition:="		, "0",
		"XSize:="		, "-L+W",
		"YSize:="		, "-L+W",
		"ZSize:="		, "3um"
	], 
	[
		"NAME:Attributes",
		"Name:="		, "BOX2",
		"Flags:="		, "",
		"Color:="		, "(255 128 0)",
		"Transparency:="	, 0,
		"PartCoordinateSystem:=", "Global",
		"UDMId:="		, "",
		"MaterialValue:="	, "\"aluminum\"",
		"SurfaceMaterialValue:=", "\"\"",
		"SolveInside:="		, False,
		"ShellElement:="	, False,
		"ShellElementThickness:=", "0mm",
		"IsMaterialEditable:="	, True,
		"UseMaterialAppearance:=", False,
		"IsLightweight:="	, False
	])


oEditor.CreateBox(
	[
		"NAME:BoxParameters",
		"XPosition:="		, "-L/2-W/2",
		"YPosition:="		, "-D/2",
		"ZPosition:="		, "0",
		"XSize:="		, "W",
		"YSize:="		, "D",
		"ZSize:="		, "3um"
	], 
	[
		"NAME:Attributes",
		"Name:="		, "BOX3",
		"Flags:="		, "",
		"Color:="		, "(255 128 0)",
		"Transparency:="	, 0,
		"PartCoordinateSystem:=", "Global",
		"UDMId:="		, "",
		"MaterialValue:="	, "\"aluminum\"",
		"SurfaceMaterialValue:=", "\"\"",
		"SolveInside:="		, False,
		"ShellElement:="	, False,
		"ShellElementThickness:=", "0mm",
		"IsMaterialEditable:="	, True,
		"UseMaterialAppearance:=", False,
		"IsLightweight:="	, False
	])


oEditor.CreateBox(
	[
		"NAME:BoxParameters",
		"XPosition:="		, "-L/2-W/2",
		"YPosition:="		, "-D/2",
		"ZPosition:="		, "0",
		"XSize:="		, "-Lg",
		"YSize:="		, "-W",
		"ZSize:="		, "3um"
	], 
	[
		"NAME:Attributes",
		"Name:="		, "BOX4",
		"Flags:="		, "",
		"Color:="		, "(255 128 0)",
		"Transparency:="	, 0,
		"PartCoordinateSystem:=", "Global",
		"UDMId:="		, "",
		"MaterialValue:="	, "\"aluminum\"",
		"SurfaceMaterialValue:=", "\"\"",
		"SolveInside:="		, False,
		"ShellElement:="	, False,
		"ShellElementThickness:=", "0mm",
		"IsMaterialEditable:="	, True,
		"UseMaterialAppearance:=", False,
		"IsLightweight:="	, False
	])

oEditor.CreateBox(
	[
		"NAME:BoxParameters",
		"XPosition:="		, "-L/2-W/2",
		"YPosition:="		, "D/2",
		"ZPosition:="		, "0",
		"XSize:="		, "-Lg",
		"YSize:="		, "W",
		"ZSize:="		, "3um"
	], 
	[
		"NAME:Attributes",
		"Name:="		, "BOX5",
		"Flags:="		, "",
		"Color:="		, "(255 128 0)",
		"Transparency:="	, 0,
		"PartCoordinateSystem:=", "Global",
		"UDMId:="		, "",
		"MaterialValue:="	, "\"aluminum\"",
		"SurfaceMaterialValue:=", "\"\"",
		"SolveInside:="		, False,
		"ShellElement:="	, False,
		"ShellElementThickness:=", "0mm",
		"IsMaterialEditable:="	, True,
		"UseMaterialAppearance:=", False,
		"IsLightweight:="	, False
	])
  • 利用合并(Unite)，相减(Substract)等操作来构建电感模型
oEditor.Subtract(
	[
		"NAME:Selections",
		"Blank Parts:="		, "BOX1",
		"Tool Parts:="		, "BOX2,BOX3"
	], 
	[
		"NAME:SubtractParameters",
		"KeepOriginals:="	, False
	])
oEditor.Unite(
	[
		"NAME:Selections",
		"Selections:="		, "BOX1,BOX4,BOX5"
	], 
	[
		"NAME:UniteParameters",
		"KeepOriginals:="	, False
	])
  • Ground建模，蓝色金属层在黄色金属层下4um处，且厚度为1um
oEditor.CreateBox(
	[
		"NAME:BoxParameters",
		"XPosition:="		, "-L/2-W/2-Lg-40um",
		"YPosition:="		, "-L/2-W/2-Lg-40um",
		"ZPosition:="		, "-4um",
		"XSize:="		, "L+W+2*Lg+80um",
		"YSize:="		, "L+W+2*Lg+80um",
		"ZSize:="		, "1um"
	], 
	[
		"NAME:Attributes",
		"Name:="		, "GND",
		"Flags:="		, "",
		"Color:="		, "(0 0 255)",
		"Transparency:="	, 0,
		"PartCoordinateSystem:=", "Global",
		"UDMId:="		, "",
		"MaterialValue:="	, "\"aluminum\"",
		"SurfaceMaterialValue:=", "\"\"",
		"SolveInside:="		, False,
		"ShellElement:="	, False,
		"ShellElementThickness:=", "0mm",
		"IsMaterialEditable:="	, True,
		"UseMaterialAppearance:=", False,
		"IsLightweight:="	, False
	])

oEditor.CreateBox(
	[
		"NAME:BoxParameters",
		"XPosition:="		, "-L/2-W/2-Lg",
		"YPosition:="		, "-L/2-W/2-Lg",
		"ZPosition:="		, "-4um",
		"XSize:="		, "L+W+2*Lg",
		"YSize:="		, "L+W+2*Lg",
		"ZSize:="		, "1um"
	], 
	[
		"NAME:Attributes",
		"Name:="		, "BOX6",
		"Flags:="		, "",
		"Color:="		, "(0 0 255)",
		"Transparency:="	, 0,
		"PartCoordinateSystem:=", "Global",
		"UDMId:="		, "",
		"MaterialValue:="	, "\"aluminum\"",
		"SurfaceMaterialValue:=", "\"\"",
		"SolveInside:="		, False,
		"ShellElement:="	, False,
		"ShellElementThickness:=", "0mm",
		"IsMaterialEditable:="	, True,
		"UseMaterialAppearance:=", False,
		"IsLightweight:="	, False
	])


oEditor.Subtract(
	[
		"NAME:Selections",
		"Blank Parts:="		, "GND",
		"Tool Parts:="		, "BOX6"
	], 
	[
		"NAME:SubtractParameters",
		"KeepOriginals:="	, False
	])

3.6 端口设置

  • 添加矩形
oEditor.CreateRectangle(
	[
		"NAME:RectangleParameters",
		"IsCovered:="		, True,
		"XStart:="		, "-2um",
		"YStart:="		, "-5um",
		"ZStart:="		, "0um",
		"Width:="		, "4um",
		"Height:="		, "10um",
		"WhichAxis:="		, "Z"
	], 
	[
		"NAME:Attributes",
		"Name:="		, "Rectangle1",
		"Flags:="		, "",
		"Color:="		, "(143 175 143)",
		"Transparency:="	, 0,
		"PartCoordinateSystem:=", "Global",
		"UDMId:="		, "",
		"MaterialValue:="	, "\"vacuum\"",
		"SurfaceMaterialValue:=", "\"\"",
		"SolveInside:="		, True,
		"ShellElement:="	, False,
		"ShellElementThickness:=", "0um",
		"IsMaterialEditable:="	, True,
		"UseMaterialAppearance:=", False,
		"IsLightweight:="	, False
	])
  • 添加端口和积分线
oModule = oDesign.GetModule("BoundarySetup")
oModule.AssignLumpedPort(
	[
		"NAME:1",
		"Objects:="		, ["Rectangle1"],
		"DoDeembed:="		, True,
		"RenormalizeAllTerminals:=", True,
		[
			"NAME:Modes",
			[
				"NAME:Mode1",
				"ModeNum:="		, 1,
				"UseIntLine:="		, True,
				[
					"NAME:IntLine",
					"Start:="		, ["0um","-5um","306um"],
					"End:="			, ["0um","5um","306um"]
				],
				"AlignmentGroup:="	, 0,
				"CharImp:="		, "Zpi",
				"RenormImp:="		, "50ohm"
			]
		],
		"ShowReporterFilter:="	, False,
		"ReporterFilter:="	, [True],
		"Impedance:="		, "50ohm"
	])
  • 修改矩形的几何参数
oEditor.ChangeProperty(
	[
		"NAME:AllTabs",
		[
			"NAME:Geometry3DCmdTab",
			[
				"NAME:PropServers", 
				"Rectangle1:CreateRectangle:1"
			],
			[
				"NAME:ChangedProps",
				[
					"NAME:Position",
					"X:="			, "-Lg-L/2-W/2",
					"Y:="			, "-D/2",
					"Z:="			, "0um"
				],
				[
					"NAME:YSize",
					"Value:="		, "D"
				],
				[
					"NAME:XSize",
					"Value:="		, "4um"
				]
			]
		]
	])

3.7 仿真设置

  • 求解频率：3GHz，MaxDeltaS：0.01，收敛次数：2
oModule = oDesign.GetModule("AnalysisSetup")
oModule.InsertSetup("HfssDriven", 
	[
		"NAME:Setup1",
		"SolveType:="		, "Single",
		"Frequency:="		, "3GHz",
		"MaxDeltaS:="		, 0.01,
		"UseMatrixConv:="	, False,
		"MaximumPasses:="	, 10,
		"MinimumPasses:="	, 1,
		"MinimumConvergedPasses:=", 2,
		"PercentRefinement:="	, 30,
		"IsEnabled:="		, True,
		[
			"NAME:MeshLink",
			"ImportMesh:="		, False
		],
		"BasisOrder:="		, 1,
		"DoLambdaRefine:="	, True,
		"DoMaterialLambda:="	, True,
		"SetLambdaTarget:="	, False,
		"Target:="		, 0.3333,
		"UseMaxTetIncrease:="	, False,
		"PortAccuracy:="	, 2,
		"UseABCOnPort:="	, False,
		"SetPortMinMaxTri:="	, False,
		"UseDomains:="		, False,
		"UseIterativeSolver:="	, False,
		"SaveRadFieldsOnly:="	, False,
		"SaveAnyFields:="	, True,
		"IESolverType:="	, "Auto",
		"LambdaTargetForIESolver:=", 0.15,
		"UseDefaultLambdaTgtForIESolver:=", True,
		"IE Solver Accuracy:="	, "Balanced"
	])
  • 扫频范围：1GHz-5 GHz，采用插值，共计401个频率点
oModule.InsertFrequencySweep("Setup1", 
	[
		"NAME:Sweep",
		"IsEnabled:="		, True,
		"RangeType:="		, "LinearCount",
		"RangeStart:="		, "1GHz",
		"RangeEnd:="		, "5GHz",
		"RangeCount:="		, 401,
		"Type:="		, "Interpolating",
		"SaveFields:="		, False,
		"SaveRadFields:="	, False,
		"InterpTolerance:="	, 0.5,
		"InterpMaxSolns:="	, 250,
		"InterpMinSolns:="	, 0,
		"InterpMinSubranges:="	, 1,
		"ExtrapToDC:="		, False,
		"InterpUseS:="		, True,
		"InterpUsePortImped:="	, False,
		"InterpUsePropConst:="	, True,
		"UseDerivativeConvergence:=", False,
		"InterpDerivTolerance:=", 0.2,
		"UseFullBasis:="	, True,
		"EnforcePassivity:="	, True,
		"PassivityErrorTolerance:=", 0.0001
	])

3.8 仿真与结果

  • 运行仿真
oProject.Save()
oDesign.Analyze("Setup1 : Sweep"）
  • 计算电感和Q值
oModule = oDesign.GetModule("OutputVariable")
oModule.CreateOutputVariable("Q", "im(Z11)/re(Z11)", "Setup1 : Sweep", "Modal Solution Data", [])
oModule.CreateOutputVariable("L_ind", "im(Z11)/2/pi/freq*1e9", "Setup1 : Sweep", "Modal Solution Data", [])
  • 查看数值结果
oModule.CreateReport("Output Variables Plot 1", "Modal Solution Data", "Rectangular Plot", "Setup1 : Sweep", 
	[
		"Domain:="		, "Sweep"
	], 
	[
		"Freq:="		, ["All"],
		"L:="			, ["Nominal"],
		"W:="			, ["Nominal"],
		"https://www.gofarlic.com="			, ["Nominal"],
		"Lg:="			, ["Nominal"]
	], 
	[
		"X Component:="		, "Freq",
		"Y Component:="		, ["Q"]
	])

oModule.CreateReport("Output Variables Plot 2", "Modal Solution Data", "Rectangular Plot", "Setup1 : Sweep", 
	[
		"Domain:="		, "Sweep"
	], 
	[
		"Freq:="		, ["All"],
		"L:="			, ["Nominal"],
		"W:="			, ["Nominal"],
		"https://www.gofarlic.com="			, ["Nominal"],
		"Lg:="			, ["Nominal"]
	], 
	[
		"X Component:="		, "Freq",
		"Y Component:="		, ["L_ind"]
	])

4. 运行结果

上述脚本自动完成了HFSS建模，仿真，和输出仿真结果

  • 建模结果如下：
  • 仿真结果如下：

参考

  1. ^http://www.ece.uprm.edu/~rafaelr/inel6068/HFSS/scripting.pdf

免责声明：本文系网络转载或改编，未找到原创作者，版权归原作者所有。如涉及版权，请联系删
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