1040
Meas
regions. This parameter can be used for I/Q vector (n=0) in Waveform (time domain) measurement
and all parameters are specified by data point in PPHase.
The rms power of the specified region may be expressed as:
Power = 10 x log [10 x (RMS I/Q value)] + 10.
The RMS I/Q value (peak volts) is:
where Xi is the complex value representation of an I/Q pair, Xi* its conjugate complex number, and n
is the number of I/Q pairs in the specified region.
The arithmetic mean phase of the specified region may be expressed as:
where Yi is the unwrapped phase of I/Q pair with applying frequency correction and n is the number
of I/Q pairs in the specified region.
The frequency correction is made by the frequency offset calculated by the arithmetic mean of every
specified region’s frequency offset. Each frequency offset is calculated by the least square method
against the unwrapped phase of I/Q pair.
Sample Trace Data - Constant Envelope
(See below for explanation of variables.)
Sample Trace Data - Not Constant Envelope
(See below for explanation of variables.)
Σ
1
_
n
Xi ∈region vsd27-9

Xi Xi*

ΣYi

1

_

nYi ∈region
vsd27-10
t0
soffset
length
roffset If rlimit is set to 3, this
last chunk of data will
be ignored.
vsd29