chapter 7 模擬電路分析的種類及輸出格式 (part i)
DESCRIPTION
Chapter 7 模擬電路分析的種類及輸出格式 (Part I). 直流分析 偏壓點分析 小信號直流轉移函數分析 靈敏度分析 直流掃描分析. 直流分析. 偏壓點分析. .OP (Operating Point) Example Find (1) Ic,Ib, Vce, Vbe (2)Q1 operating situation. Simulation By SPICE. Operating point example 7-4 VCC 1 0 12v R1 1 2 120K R2 2 0 80K RC 1 3 10K RE 4 0 5K - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Chapter 7 模擬電路分析的種類及輸出格式 (Part I)](https://reader033.vdocuments.net/reader033/viewer/2022061419/5681587a550346895dc5db2b/html5/thumbnails/1.jpg)
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Chapter 7 模擬電路分析的種類及輸出格式 (Part I)
直流分析 偏壓點分析 小信號直流轉移函數分析 靈敏度分析 直流掃描分析
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直流分析
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偏壓點分析 .OP (Operating Point) Example Find (1) Ic,Ib, Vce, Vbe
(2)Q1 operating situation
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Simulation By SPICEOperating point example 7-4VCC 1 0 12vR1 1 2 120KR2 2 0 80KRC 1 3 10KRE 4 0 5KQ1 3 2 4 Q2N2222.Model Q2N2222 NPN(BF=110).OP.Options nopage.END
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Simulation Output File
Vbe=0.766
v
Vce=0.929
v
Vbc=-0.163v -> Active Region
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Simulation By OrCAD PSpice
0
2
R1
120k
2
13
Vcc
12V
1
Re
5k
2
1
Q1
Q2N2222
Rc
10k
2
1
4
R2
80k
2
1
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Simulation Setting
.op
Analysis
Type
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Simulation Output File
0
2
R1
120k
2
13
Vcc
12V
1
Re
5k
2
1
Q1
Q2N2222
Rc
10k
2
1
4
R2
80k
2
1
4.541
4.2507
3.9016
hfe=255.9
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小信號直流轉移函數分析 主要功能在計算電路之
小信號之直流輸入電阻 Rin=Vin/Iin
小信號之直流輸出電阻 Rout=Vo/Io
小信號之直流轉移函數 (1) Av=Vout/Vin (2) AI=Iout/Iin
(3) Gm=Io/Vin (4) Rm=Vo/Iin
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轉移函數之描述 TF: Transfer Function .TF OutvarI Insource Examples
.TF V(8) Vin .TF I(V1) VG .TF V(5,0) Is
若該電流沒有流過一獨立之電壓電源 , 則應串一電壓
為零的獨立電壓電源
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ExampleFrom the follows circuit, please use OrCAD PSpice to find (1) Vo/Vin (2) Input Resistance (Rin)(3) Output Resistance (Rout)
Rout
Rin
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Simulation Setting
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Simulation Results
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靈敏度分析 (Sensitivity Analysis) 靈敏度分析是在計算某一個或多個輸出
電壓或電流變數對每一個裝置參數的直流小信號之靈敏度
靈敏度分析之描述 .SENS VA1<VA2>…. Example V(1) I(V1) V(5,6) I(VS)
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Example Find the DC small-signal sensitivities
of VR3 from the following circuit.
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Circuit
3
R3
2k
R2
1kVR3
Vcc100V
1R1
1k
2
0
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Simulation settings
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Simulation Results 3
R3
2k
R2
1kVR3
Vcc100V
1R1
1k
2
0
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直流掃描分析 (DC Sweep Analysis) 求出電路的某一電源 ( 或兩個以上 ) 全域參數 ,
模型參數或溫度變數在某一範圍變化時 , 其電路的某一元件 ( 電壓或電流 ) 輸出之變化
直流掃描分析可分為兩種 一般直流掃描 : 只掃描一個變數 巢狀掃描 (Nested DC Sweep): 同時掃描兩個變數 ,
第二個掃描變數每變化一次 , 第一個掃描變數要全部變化完畢
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直流掃描分析所做的工作 求出電路之直流工作點 , 電感器視為短路 ,
電容器視為開路 進行直流掃描
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直流掃描分析描述格式 SPICE 之格式
.DC SName Start Stop Incre<SName2 Start2 Stop2 Incre2>
OrCAD PSpice 之格式 .DC SName Start Stop Incre<SName2 Start2 Sto
p2 Incre2> 或 .DC <LIN> SWN Start Stop Incre< SWN2 Start2 St
op2 Incre2>… 或 .DC <OCT><DEC> SWN Start Stop NO< SWN2 Sta
rt2 Stop2 NO2> .DC SWN LIST VALUE…
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Example( 一般直流掃描 ).DC VIN -1 2 0.5.PRINT DC V(R1)
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Example( 巢狀掃描 ).DC IB 0 12ma 2 ma VCE 0 6 2
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直流掃描分析輸出描述 ( 電路描述法 ).PRINT DC VA1 <VA2…..VA8>.PLOT DC VA1<LO1,HI1>
VA2<LO2,HI2> …. VA8<LO8,HI8>.PROBE (PROBE.DAT).PROBE VA1<VA2….> (PROBE.DAT) Example
.PRINT DC V(5) V(3,4) I(V1) I(R1) .PROBE
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直流掃描分析輸出描述 (OrCAD PSpice 描述法 )
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Watch 之操作
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直流掃描分析實例( 使用電路描述 ) 求出電路在 Vin=0v~12v, 每次增加 1v 時 ,
VR4 及 IR2 的變化如何 ?
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Input File
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Output File (1)
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Output File (2)
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PLOT
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Insert I(R2)
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Vin vs I(R2) Curve
I(R2
)
VIN
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Insert V(3)
V(3) i.e. VR4
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Vin vs VR4 Curve
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直流掃描分析實例( 使用 OrCAD PSpice 繪圖方式 ) 利用 OrCAD PSpice
求出二極體電路之伏安特性曲線
D1
D1N4002
0
VD3V
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Simulation Settings
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Insert I(D1)
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PLOT VD vs I(D1)
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Example 利用 OrCAD PSpice 求出 Q2N2222 電晶
體的輸出特性曲線 ? 若 VCC 為 10V, 負載電阻為 5K, 試繪出其負載線 .
Vcc15V
Q1
Q2N2222
1
2
0
Ib
10uA
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Simulation Settings (1)
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Simulation Settings (2)
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Plot Setting
IC(Q1)
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Plot Curve (Vcc vs IC(Q1))
IC(Q1)
Vcc
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負載線之設定
10V-V_VCC
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負載線
刮子家It’s m
e!
0 (10,0)
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Axis Setting
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Y Axis Setting
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最後之負載線Q 點
(5V,1mA)
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Question & Answer