In a given transistor amplifier, ๐ ๐ถ = 2.2๐ฮฉ ๐๐๐ ๐๐โฒ = 20ฮฉ, ๐กโ๐ ๐ฃ๐๐๐ก๐๐๐ ๐๐๐๐ ๐๐ (a) 2.2 (b) 110 (c) 20 (d) 44
Question
In a given transistor amplifier,
๐
๐ถ = 2.2๐ฮฉ
๐๐๐
๐๐โฒ = 20ฮฉ,
๐กโ๐
๐ฃ๐๐๐ก๐๐๐
๐๐๐๐
๐๐
(a) 2.2
(b) 110
(c) 20
(d) 44
Solution
The voltage gain (Av) of a common emitter amplifier is given by the formula:
Av = -RC/re'
Where: RC is the collector resistance re' is the internal emitter resistance
Given that RC = 2.2kฮฉ = 2200ฮฉ and re' = 20ฮฉ, we can substitute these values into the formula:
Av = -2200/20 = -110
However, since gain is usually considered as an absolute value, we take the magnitude and ignore the negative sign. Therefore, the voltage gain is 110.
So, the correct answer is (b) 110.
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