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AD8331 input design

Category: Hardware
Product Number: AD8331

Hello,

My design is to decode a 5MHz BPSK signal. I am using a AD8331 to amplify the signal and then drive a AD9203 10bit 40MSPS ADC. The input signal passes through a bandpass filter before the AD8331 input. I have used the circuit from the AD8331eval pcb as the basis for my design.

The circuit all works as I would like, the only problem is that after the circuit is powered up I need to touch with a finger around the input filter to get any output. After that the circuit works fine.

My question is what do I need to change to get it to work after power up?

Clive 

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