Скачать или смотреть Frequency Response of Transformer Coupled Amplifier| Teck Gurukul by Dinesh Arya

Frequency Response of Transformer Coupled Amplifier| Teck Gurukul by Dinesh Arya
Introduction
A transformer coupled amplifier uses a transformer at the output for impedance matching.
Its frequency response shows variation of gain with frequency.
Low Frequencies
Transformer primary reactance (XL = 2pfL) is low.
Causes losses and reduced gain.
Mid Frequencies
Reactance is optimum, transformer works efficiently.
Gain is maximum and almost flat.
High Frequencies
Leakage inductance and inter-winding capacitance dominate.
Causes signal shunting and reduced gain.
Applications
Used in power amplifiers to drive loudspeakers.
Used in RF amplifiers with tuned circuits.
Limitations
Poor frequency response, not suitable for audio fidelity.
Bulky, expensive transformer, harmonic distortion.
Conclusion
Frequency response curve shows sharp fall at low and high frequencies.
Gain is maximum only in mid-band range.
Suitable for power transfer and RF applications, not for hi-fi audio.

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