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reducing the noise of the circuit

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I have designed a electronic switcher board.now I need a low noise power supply (+5 and -5 volt and at least 700 mA current). my current power supply is designed with 7805 and 7905 , but it has at about 300 mili-volt noise.
by the way I have employed a AT89C51 , some digital ICs and two 74HCT4051 as a analog switch and AD826 as a video amplifier and a 16 character LCD and ...
I want to seperate the ground of digital and analog to reduce the noise. do you have any other recomendation.
at last I want to design a inverting amplifier with AD826. What do you recomend ?do you have any good design that reduce the noise ?
Thaks in advance
Ramin
 

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