Multisim troubles

lifthanger

Member

Join Date: Dec 2010

Posts: 10
#1

Multisim troubles

01-18-2011, 04:33 AM

please delete :/.
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Last edited by lifthanger; 01-18-2011, 04:39 AM.
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Th3_uN1Qu3

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Join Date: Jul 2010

Posts: 6030

Country: Romania
#2

01-18-2011, 04:37 AM

Re: Multisim troubles

Are you trying to design a common emitter amplifier? If so, you have your top base resistor wired to the wrong place. Edit: Just threw it in LTSpice - it does swing negative due to the input signal. There are two things wrong in your circuit.

#1. Your biasing is wrong.
#2. Your input signal is too high in amplitude. 7 volts AC peak is 14 volts p-p. The DC supply voltage needs to be at least this value minus the voltage drop of the transistor. Since you are not using a split supply, your DC supply is 12 volts. And since you're trying to get some gain as well... all you will get is a square wave with DC offset on the output.

Last edited by Th3_uN1Qu3; 01-18-2011, 04:47 AM.

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