aaron_do
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Hi,
it depends on the bandwidth of your low-pass filter. Definitely the phase shift is not going to be zero, but if the bandwidth is wide enough, then the phase shift will be minimal.
In your case, with a 50 MHz IF, your LPF is probably going to cause considerable phase shift. Off the top of my head you could:
1. Use a bandpass filter instead.
2. Digitize the signal first and use a digital filter. You will need a pretty high sampling rate so that your anti-aliasing filter doesn't cause any phase shift.
3. Choose a lower IF?
When you say you need the exact phase, I assume you mean w.r.t the transmitted signal right? If you describe your application a bit you will probably get better responses.
regards, Aaron
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