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Post subject: p1 db?
Posted: Tue Nov 22, 2005 9:49 pm
output p1 I know how to measure Op1dB on a vna using
power sweep but am trying to figure it out using
Sig gen and power meter. (wich one is more accurate?)
I am thinking you reference the output power on
the PM then increase the input pwr by 10 and wait
till i only get 9db but that seem's to me to be
a hard way. Thanks in advance for any help and
Posted: Wed Nov 23, 2005 12:22 am
Joined: Sun Aug 03, 2003
2:02 pm Posts: 476 Location: Erie, PA
Both the VNA and
the signal generator + power meter methods should
produce the same results provided the test is carried
out properly. Be certain to obtain a reference gain
for the device under test (DUT) while it is operating
well within the linear operating region, and with
the input reference signal at least 20 dB above
the noise floor - ideally filtered to the BW of
the system operational BW. Then, as you state, find
the output power at which the gain of the DUT is
1 dB less than the linear gain. Making the measurement
with the signal generator + power meter really does
not take long if you are only testing a few devices.