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What does the performance of a transistor amplifier depend upon?

      

What does the performance of a transistor amplifier depend upon?

  

Answers


Wilfred
(i) Input resistance: It is the ratio of small change in base-emitter voltage (change in VBE) to the resulting change in base current (change in IB) at constant collector-emitter voltage i.e.
comm7a1582019821.png

(ii) Output resistance: It is the ratio of change in collector emitter voltage (change in VCE) to the resulting change in collector current (change in IC) at constant base current i.e.
comm81582019821.png
- The output characteristics reveal that collector current changes very slightly with the change in collector- emitter voltage. Therefore, output resistance of a transistor amplifier is very high– of the order of several hundred kilo-ohms.
- The physical explanation of high output resistance is that collector-base junction is reverse biased.

(iii) Effective collector load: It is the total load as seen by the a.c. collector current.
In case of single stage amplifiers, the effective collector load is a parallel combination of RC and RO as shown in Fig. 4.48 (i).
comm8a1582019821.png

(iv) Current gain: It is the ratio of change in collector current (change in IC) to the change in base current (change in IB)
i.e.
comm91582019821.png

(v) Voltage gain: It is the ratio of change in output voltage (change in VCE) to the change in input voltage (?VBE)
i.e.
comm9a1582019821.png

(vi) Power gain: It is the ratio of output signal power to the input signal power i.e.
comm101582019821.png
Wilfykil answered the question on August 15, 2019 at 07:51


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