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Ic Vce) For Different Values of The Transistors Base Current (Ib)

The document discusses biasing transistor amplifiers, which establishes the correct operating point of the transistor amplifier to receive signals without distortion. It explains that output characteristic curves relate a transistor's collector current and collector voltage for different base currents, and a load line shows possible operating points from fully on to fully off, including the quiescent point. The best position for the quiescent point is in the center of the load line for lowest distortion as a Class A amplifier.

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Chintu Das
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60 views1 page

Ic Vce) For Different Values of The Transistors Base Current (Ib)

The document discusses biasing transistor amplifiers, which establishes the correct operating point of the transistor amplifier to receive signals without distortion. It explains that output characteristic curves relate a transistor's collector current and collector voltage for different base currents, and a load line shows possible operating points from fully on to fully off, including the quiescent point. The best position for the quiescent point is in the center of the load line for lowest distortion as a Class A amplifier.

Uploaded by

Chintu Das
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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In the previous introduction to the amplifier tutorial, we saw that a family of curves

known commonly as the Output Characteristic Curves, relate the transistors Collector


Current (Ic), to its Collector Voltage (Vce) for different values of the transistors
Base Current (Ib).
All types of transistor amplifiers operate using AC signal inputs which alternate between
a positive value and a negative value so some way of “presetting” the amplifier circuit to
operate between these two maximum or peak values is required. This is achieved using
a process known as Biasing. Biasing is very important in amplifier design as it
establishes the correct operating point of the transistor amplifier ready to receive
signals, thereby reducing any distortion to the output signal.
We also saw that a static or DC load line can be drawn onto these output characteristics
curves to show all the possible operating points of the transistor from fully “ON” to fully
“OFF”, and to which the quiescent operating point or Q-point of the amplifier can be
found.
The aim of any small signal amplifier is to amplify all of the input signal with the
minimum amount of distortion possible to the output signal, in other words, the output
signal must be an exact reproduction of the input signal but only bigger (amplified).
To obtain low distortion when used as an amplifier the operating quiescent point needs
to be correctly selected. This is in fact the DC operating point of the amplifier and its
position may be established at any point along the load line by a suitable biasing
arrangement.
The best possible position for this Q-point is as close to the center position of the load
line as reasonably possible, thereby producing a Class A type amplifier operation,
ie. Vce = 1/2Vcc. Consider the Common Emitter Amplifier circuit shown below.

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