Thanks for ur reply.But today my boss tell me the noise figure from 10MHz to 15MHz must be less than 0.8dB. In wea101.pdf, the noise figure below 20MHz is larger than 1dB.It can't reach my requirement.
Can you have any other good suggestions for me?
In addition,if i want to design it by myself,what kinds of devices should i select?
It is hard to get the NF values from the data sheet of any vendor as the current BJT transistors are capable of operating at 4 to 6GHz.
It is the call you have to take that say ATF35143 which is based on GaAs has low NF around 0.5dB. But Data sheet is not indicating the NF at 10MHz range.
It might be true if we extend the NF curve to 10MHz.
In this case I will try ATF device and decide if it fails.
In my view it may not fail by 90% to meet the required NF