Circuit Simulator - Common-Emitter Amplifier

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Circuit Description:

This is a common-emitter amplifier, which amplifies the input voltage about 10 times.

The capacitor and the 110k and 10k resistors bias the transistor's base at about 1.7 V, so that the average value of the input is moved up to that level. The base-emitter junction acts like a diode, so that the emitter will be a diode drop lower than the base. Since the transistor stays in forward-active mode, the collector current will be 100 times the base current.

The emitter voltage fluctuates with the input voltage, and so the current across the 1k resistor fluctuates proportionately. Since the collector resistor has the same current across it but has 10 times the resistance, the collector voltage swings 10 times as much (and with phase opposite to the input).

Note that the peak value of the output is not 5 V as this analysis would predict. The actual gain is more like 9.5 times for various reasons. For example, the base-emitter drop is not constant, but varies with the base current.

Credits: Mr. Paul Falstad.

Ahmad said: (Tue, Sep 13, 2011 07:08:00 PM)    
I need the circuit operation.

Praburaj said: (Wed, Feb 13, 2013 01:01:09 AM)    
Is this only for AC? Can it be used for DC?

K.Ravi said: (Fri, May 17, 2013 09:16:21 PM)    
How to phase shift in ce configuration explain?

Athar Zahoor said: (Sat, Apr 5, 2014 11:42:19 PM)    
Why is the phase shift of 180 in CE amplifier?

Taha said: (Wed, Apr 9, 2014 11:14:50 PM)    
Create a MATLAB GUI for designing Common Emitter Display of circuit diagram.

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