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Below are all of the forum threads, including all
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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 input.
Posted: Wed Nov 23, 2005 12:22 am
Joined: Sun Aug 03,
2003 2:02 pm Posts: 476 Location: Erie,
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.