Question about output stage

I want to implement this output stage
http://img143.imageshack.us/img143/5350/classabyg0.jpg
but i want to use it as class A amplifier and not as AB class.
If i use it as class A, all mosfet are on during 2pi period of
sinusoid, so Ioutmax is equal to 4Iquies.
But if i calculate efficiency, i obtain this result
http://img148.imageshack.us/img148/771/astagejk3.jpg
What's wrong?
Thanks

 

[Phil Allison]

<lionelgreenstreet@gmail.com>

I want to implement this output stage
http://img143.imageshack.us/img143/5350/classabyg0.jpg
but i want to use it as class A amplifier and not as AB class.
If i use it as class A, all mosfet are on during 2pi period of
sinusoid, so Ioutmax is equal to 4Iquies.

** Nonsenese.

I out max = 2 x I quies.

At full sine wave output, current in each mosfet varies from zero to double
I quies.

Max efficiency =50 %.



...... Phil