Transformer coupled class A amplifier

Posted by AJ × 06:23

Ø The transformer can step up or step down a voltage applied to primary coil .

Transformer coupled class A PA

• A form of class A amplifier having maximum efficiency of 50% uses

transformer to couple the output signal to the load.

Impedance transformation

Load resistance reflected to the primary side as,

Transformer coupled amplifier

• Drawing DC and AC load line

• Signal swing and output AC power

Power across the load can be expressed as

• IL=I2=N1/N2 IC
• with the output ac power then calculated using
PL=IL

2(rms) RL

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