# Class AB Amp Power Efficiency - How to calculate?

Thread Starter

#### garik111

Joined Sep 15, 2011
3
Hi
I have a HW question to calculate power efficiency - Please help me

3. A CMOS Power Amplifier operates at class AB. The conduction Angle is 135?. The Vds breakdown voltage (the highest voltage achievable)=3.3V and 10mA is set to be the highest current allowed. The gain of this amplifier is 12dB. The overdrive (Vdsat - the min voltage for saturation region) is equal .4V
a. What is the Efficiency Pout/Pin in this conduction angle if Vdsat =0V?
b. What is the max power achievable if Vdsat =0V?
c. What is the PAE of this amplifier if Vdsat =0V?
d. What is the Efficiency Pout/Pin in this conduction angle if Vdsat =.4V?
e. What is the max power achievable if Vdsat =.4V?
f. What is the PAE of this amplifier if Vdsat =.4V?

#### Georacer

Joined Nov 25, 2009
5,182
Care to show us what you have done so far?

Thread Starter

#### garik111

Joined Sep 15, 2011
3
Care to show us what you have done so far?
I have already solved it. Thanks

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