Obtaining Phase information

1. Aug 10, 2011

DSPly

Hi

I am wondering in which way a vector network analyzer obtains the phase information (in SFCW / FMCW mode).

Can someone provide me further information about how an VNA works?

Thanks!

2. Aug 10, 2011

f95toli

AFAIK they just use what is in essence an IQ demodulator, i.e. the phase is calculated from the I(nphase) and Q(uadrature) components of the signal.

Measuring phase is actually quite easy (all you need is a saturated mixer), doing it accurately is a bit more tricky.