How can I calculate R1 and R2 values for this transistor biasing circuit?

AI Thread Summary
To calculate R1 and R2 values for the transistor biasing circuit, start by determining the base current (Ib) using the collector current (Io) of 10mA and the DC current gain (hFE) of 80. The total current through R2 is the sum of Io and Ib, and with a voltage drop of 6V across R2 (16V - 10V), R2 can be calculated. For R1, the voltage across it is 9.3V (10V - 0.7V), and using Ib, its value can also be determined. This method provides a systematic approach to finding the necessary resistor values for the desired operating point. Accurate calculations ensure proper biasing in the transistor circuit.
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Hi guys,

I am trying to find a way to calculate biasing network for the attached circuit.

Basically I need to find R1 and R2 values for operating point of I0 = 10mA and V0 = 10V and Vs = 16V.
DC current gain is assumed to be hFE=80.

How do you calculate R1 and R2 based on these info? Please let me know.

Thanks in advance!
 

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You know the collector current Io so you can work out the base current from Hfe.

So, this total current (Io + Ib) passes through R2 and you know the voltage across R2 (16 - 10) so you can work out R2.

Then, you know the voltage across R1 (10 -0.7) and you know the current flowing in it (Ib) so you can work out the value of this resistor.
 
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