Which transformer is used for impedance matching in transistor coupled amplifier?(a) step-up(b) step-down(c) same turn ratio(d) differentturn ratioI have been asked this question by my school teacher while I was bunking the class.I need to ask this question from Multistage Amplifier in section Differential and Multistage Amplifiers of Electronic Devices & Circuits

Which transformer is used for impedance matching in transistor coupled

1.	Which transformer is used for impedance matching in transistor coupled amplifier?(a) step-up(b) step-down(c) same turn ratio(d) differentturn ratioI have been asked this question by my school teacher while I was bunking the class.I need to ask this question from Multistage Amplifier in section Differential and Multistage Amplifiers of Electronic Devices & Circuits
Answer» The correct CHOICE is (B) step-down The best explanation: Usually the impedance of an output device is a few ohms WHEREAS output impedance of the transistor is several 100 ohms. In order to match the impedance a step down TRANSFORMER of proper turn’s ratio is used. The impedance of secondary of the transformer is made EQUAL to the load impedance and primary impedance equal to the output impedance of the transistor.

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