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
• with the output ac power then calculated using
PL=IL
2(rms) RL
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