How to calculate the noise of a circuit~~

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ZengLei

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Hi all
i want to design a low noise preamplifier for a data sample collector.
and the signal from the sensor is very very samll,in order to prevent the usefull signal from swampped by the noise made by the circuit itself i need to design a low noise preamplifier circuit to amplify the signal.

so how should i choose the component for the amplifier.

what kind of operatinal amplifier i must choose??
what kind of component i should choose,BJT,JFET or CMOS??

Thanks~~~~~~~~
 

u can use cmos amplifier
 

The LF356/LF357 OP AMP JFET family are very good solutions. They have low noise, low drift, high impedance and wideband.
 

ATF54143,and use the ADS to do the simulation
 

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