Modification of NPN transistor amplification simulation parameters

Modification of NPN transistor Amplification Simulation parameters

In the use of Multusim10.1 software for NPN transistor amplification Simulation, the experimental results and calculated results are inconsistent, it took me several days, finally found the reason. In order to let everyone less detours, summed up as follows:

The circuit diagram is as follows:

known : RBB ' =300ω,β=50, calculated according to the parameters

Ibq= (VCC-UBEQ)/rb= (12-0.7)/280k=40μA

Rbe=rbb ' + (26mV)/ibq=300+650=950Ω

RL ' =rc//rl=3kω//3kω=1.5kω

áu=-(betaRL ')/rbe=-(x1.5)/0.95=-78.9

but in the initial experiment, I measured the output voltage UO=1.2V, ui=10mv, when large multiples of áu=-(1200/10) =-120

is far from the theoretical calculation.

How to solve this problem?

in fact, just modify the parameters of the BJT_NPN transistor Beta,RBB ' it's ready.

The steps are as follows:

1) Double- Click the bjt_npn transistor, and in the dialog box that appears the value tag, such as:

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/6B/7B/wKiom1UuZoLQmLzmAAEEb7xtpWo434.jpg "title=" 2.jpg " alt= "Wkiom1uuzolqmlzmaaeeb7xtpwo434.jpg"/>

2) Click "Edit Model"and a dialog box appears

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/6B/76/wKioL1UuZ-nDA-YFAAH7IvN3e2Y136.jpg "title=" 3.jpg " alt= "Wkiol1uuz-nda-yfaah7ivn3e2y136.jpg"/>

3) Modify the BF value in this dialog box to 50

4) Modify the RB value to 0.3KΩ

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/6B/7B/wKiom1UuZqWRuELfAAH0JpUCUsk271.jpg "title=" 4.jpg " alt= "Wkiom1uuzqwruelfaah0jpucusk271.jpg"/>

5) Then the simulation, you can see the output voltage UO=781.36MV

6) this.width=650, "width=" height= "src="/e/u261/themes/default/images/"áu= 650" Spacer.gif "style=" Background:url ("/e/u261/themes/default/images/word.gif") no-repeat center;border:1px solid #ddd; " alt= "Spacer.gif"/>=-(781.36/10) =-78.1

and the theoretical calculation of the magnification of -78.9 basically close.

in addition, input voltage should be selected input signal voltage source (Signal Voltage Source) and set peak-to-peak to 14.14mV, frequency 1KHz.

This article is from the "9827101" blog, please be sure to keep this source http://9837101.blog.51cto.com/9827101/1633111

Modification of NPN transistor amplification simulation parameters