solar cell supply

i would like to use clean sun energy(solar cell battery) in supplying small signal amp.PHEMT ATF36077 ,How i determine the no. of cell according to the ampere delivered to amp.,is there acurve pls reply me
regards

Cells usually come packaged in a holder that is waterproof and is rated at open circuit voltage and short circuit current when the sun is shining directly on it at a normal (perpendicular) angle. There will be data sheet graphs of voltage-current for different sun angles. From this you can determine which model of panel to use from your requirements of hours of operation and cloudy sky conditions. You should follow the array with a switching converter so that the output voltage is constant at the value your circuit needs.