How to solve this circuit

I've found this circuit
http://img521.imageshack.us/img521/8127/fasdgspi6.jpg
but i don't konw how to obtain this result
http://img293.imageshack.us/img293/5995/isggsdgps5.jpg
with Rs<<Rl and Req=RjRl/(Rl+Rj)
How can i obtain Pout?
thanks

 

On 22 Apr, 00:14, "Dan Coby" <adc...@earthlink.net> wrote:

lionelgreenstr...@gmail.com> wrote in message

news:16e7503c-fb32-4e59-ad48-82deeaaa9087@l64g2000hse.googlegroups.com...

I've found this circuit
http://img521.imageshack.us/img521/8127/fasdgspi6.jpg
but i don't konw how to obtain this result
http://img293.imageshack.us/img293/5995/isggsdgps5.jpg
with Rs<<Rl and Req=RjRl/(Rl+Rj)
How can i obtain Pout?
thanks

Set Rs to 0 and then do your calculations.

ok, i tried but my procerure is wrong....Can you say me how obtain
Pout?
thanks