Common Emmitter Help

Thread Starter

darylsingh

Joined Jul 10, 2011
15
The values of R1 and R2 are not given. I have attached the schematic that I have and I need to figure out the values of R1 and R2 with the ICQ=10mA, VBE=0.7V, and Beta = 100. Thanks for the help.
 

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Adjuster

Joined Dec 26, 2010
2,148
First calculate the base voltage, roughly IC*RE + VBE, but maybe your examiner expects you to know that IE is a bit bigger than IC? Then find the base current. You know the collector current and the current gain...

Now work out the potential divider resistors: here there are many possibilities, but one rule of thumb might be to assume that the resistor to VCC passes 10*IB, and the resistor to ground passes 9*IB. Again, your teachers may expect some other rule to be followed.

The answers may or may not be close to preferred values, and your teacher may or may not expect you to do something about that.
 
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