transistor pspice

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Settin g up E nh an cemen t m od e MOSFET in PSPICE of 6

Setting up Enhancement mode MOSFET in PSPICE

1. In the Schematics window, click on Draw on the menu bar -> Get New Part . You will get the

followingdialogbox

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2. Select Libraries to get the following dialog box. Select breakout.slb library as shown in the

image below.

For Nmos Enhancement mode Select part MbrcakN as shownFor Pmos Enahancement mode Select part MbreakP

Select OK and Place & Close

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S etting up E nhancem ent m ode MOSFET in P SP IC E of

Part Library

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100101 MbreakN3 burr bin. sib100102 MbreakN3D cd4000slb100107 MbreakN4

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100117 MbreakN4D comlindb100118 MbreakP connect. sib100122 MbreakP3 darlngtnsib100124 MbreakP3D dataconv.slb100125 MbreakP4 dc_prim.slb100130

MbreakP4D dig_edslb ~100131

P O T100136

Qbreakl100141

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I·100151QbreakN3

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QbreakN4Cancel I.

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3. Place the part at the desired location and select it as shown

4. Select Edit from the menu bar and choose Model from the menu to get the following Dialog Box

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MbreakN

5. Select Edit Instance Model (Text) .. to get the following window

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tzengy/ELEC2210%20Spnng%202004jPsplce/Setti...11/9/2007



Setting up Enhancement mode MOSFET in PSPICE

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6. Type in the parameters you want to specify with the corresponding values

Following parameters can he specified for a Enhance mode mosfet (These parameters are

labeled exactly in the same manner for both PMOS and NMOS)

(a) (a) Threshold Voltage as Vto =1

(b) (b) Proportionality Constant Kp = 25u(c) (c) Length L=l

(d) (d) WidthW =1

(e) (e) y Gamma = 0

(f) (f) 4 > Phi = 0

*The values given above and in the image below are just for understanding purpose. The actual

values will depend on the problem you are trying to solve. You do not need to specify all the

parameters, only the ones required by the problem.There are more parameters which can be

specified for a MOS. But those are beyond the scope of this course.

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Setting up Enhancement mode MOSFET in PSPICE of

7. Select OK after typing in the values of the required parameter and build the rest of the circuit.

. . . . . . . . . . . . · 1· · ExpandAKOI sH...........................................................

Setting up BJT in PSPICE

The steps to setup BJT are almost same as that of MOSFET with following changes:

In step 2, after selecting "Breakout.sfb" library choose

QbreakN for npn transistor

Qbreakf' for pnp transistor

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Setting up Enhancement mode MOSFET in PSP ICE of 6

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The parameters that can be specified for a BJT are as follows:

(g) (g) f 3 as BF::= 200

(h) (h) Reverse Saturation Current IS =Ie-IS

(i) (i) Early Voltage VAF::: 130

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Setting up Enhancement mode MOSFET in PSPICE of

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