GATE EC 2014 Set 4 — Question 48
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Analog Circuits → BJT & MOSFET Amplifiers → CE, CB & CC Configurations
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Question
A BJT in a common-base configuration is used to amplify a signal received by a 50 antenna. Assume mV. The value of the collector bias current (in mA) required to match the input impedance of the amplifier to the impedance of the antenna is________.
Correct answer
0.49 to 0.51
Solution
The input impedance of a BJT in common-base configuration is given by:Given:
- Antenna impedance (to be matched)
- Thermal voltage mV
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