# Bipolar Transistor Design

#### Papabravo

Joined Feb 24, 2006
20,606
I would try some high school algebra.

#### MrChips

Joined Oct 2, 2009
29,849
Begin by ignoring Cc and RL for now. They will affect the low-frequency response (which you did not specify).

You were given Vcc and Ic which is a good start.

Given VB = 1V you can determine VE and hence RE.
Given Vcc = 12V aim for VCE = 6V. Now determine RC.

Just for starters.

Now go find IB and R1 and R2.

#### failing_engineer

Joined May 3, 2021
7
Begin by ignoring Cc and RL for now. They will affect the low-frequency response (which you did not specify).

You were given Vcc and Ic which is a good start.

Given VB = 1V you can determine VE and hence RE.
Given Vcc = 12V aim for VCE = 6V. Now determine RC.

Just for starters.

Now go find IB and R1 and R2.
Where can I find the formulas?

#### failing_engineer

Joined May 3, 2021
7

#### failing_engineer

Joined May 3, 2021
7
Given: R1=80k, R2=10k, RC = 2k, RL=2k, RE=100, b = 300, frequency of Vin is 10KHz, peak voltage of Vin is 1mV.
Calculate VBB, VCE, VC , IC , Vload, Av , Vout. and show your assumption for VBE along with a justification for the value of VBE you assumed. Calculate the value for the coupling capacitors

#### Papabravo

Joined Feb 24, 2006
20,606
• failing_engineer

#### failing_engineer

Joined May 3, 2021
7

#### MrChips

Joined Oct 2, 2009
29,849
OMG! We showed you how to do it already.

#### click_here

Joined Sep 22, 2020
548

#### MrAl

Joined Jun 17, 2014
10,909
Given: R1=80k, R2=10k, RC = 2k, RL=2k, RE=100, b = 300, frequency of Vin is 10KHz, peak voltage of Vin is 1mV.
Calculate VBB, VCE, VC , IC , Vload, Av , Vout. and show your assumption for VBE along with a justification for the value of VBE you assumed. Calculate the value for the coupling capacitors
Hello,

You have to show your attempt to solve this in this part of the forum.

But also, is "b=300" is that the Beta of the transistor or the circuit gain?
I ask because they ask for the value of the coupling capacitors but they do not give an overall circuit gain at a particular frequency. Normally you would want this information so you could calculate those cap values to within some reasonable limits.

Check and see if there is anything else to this problem question, and show some work.

#### MrAl

Joined Jun 17, 2014
10,909
How do I find Ve and Ib?
What have you been taught in school so far? Can you show some work to start with?