Hi Guys,
This is my first post on here so first of all "Hello!"
Right down to business. I have to design a two stage common emitter amplifier with a gain of 30, I have been given loads of notes but Im needing someone to point me in the right direction with it. Firstly im trying to just design a single stage amplifier get it working then basically just join two together. I know that then I can get the gain by just using 1/beta in the feedback.
I have been told that I can choose the supply and then choose the Ic. I used a supply of 15V and then an Ic of 4mA. The formulas I have been given to get the rest of the circuit are as follows
1, Choose Ic I used: 4mA
2, Make Ve 10% of Vcc I calculated 1.5V
3, Re = Ve/Ic I calculated 375 ohms
4, Rc = Vcc/2Ic I calculated 1.875K ohms
5, R2 = 10 x Re I calculated 3.75K ohms
6, R1 = (Vcc-(Ve+0.7))x R2 I calculated 21.8K ohms
Ve+0.7
Ok so I have done all my calculations and then built the circuit on multisim. The circuit inverts the output but does not ampilfy it? The output voltage is extately the same magnitude as the input
I have attached a copy of my circuit with the wave forms on it but if any other info is needed please just leave a message.
This does seem a monster first post but any help anyone could give me would be much appreciated. Thanks
This is my first post on here so first of all "Hello!"
Right down to business. I have to design a two stage common emitter amplifier with a gain of 30, I have been given loads of notes but Im needing someone to point me in the right direction with it. Firstly im trying to just design a single stage amplifier get it working then basically just join two together. I know that then I can get the gain by just using 1/beta in the feedback.
I have been told that I can choose the supply and then choose the Ic. I used a supply of 15V and then an Ic of 4mA. The formulas I have been given to get the rest of the circuit are as follows
1, Choose Ic I used: 4mA
2, Make Ve 10% of Vcc I calculated 1.5V
3, Re = Ve/Ic I calculated 375 ohms
4, Rc = Vcc/2Ic I calculated 1.875K ohms
5, R2 = 10 x Re I calculated 3.75K ohms
6, R1 = (Vcc-(Ve+0.7))x R2 I calculated 21.8K ohms
Ve+0.7
Ok so I have done all my calculations and then built the circuit on multisim. The circuit inverts the output but does not ampilfy it? The output voltage is extately the same magnitude as the input
I have attached a copy of my circuit with the wave forms on it but if any other info is needed please just leave a message.
This does seem a monster first post but any help anyone could give me would be much appreciated. Thanks