Keysight M9290A Manual page 80

Definitions of terms used in this chapter
Let P (S)= Power of the signal; P
signal
harmonic distortion (P
harmonic); P = Total power of the signal, noise and distortion components.
total
Term Short Hand
Distortion
N + D
------------------------ -
S + N +
THD
D
--- -
S
SINAD
S + N +
------------------------ -
N + D
SNR
S + N +
------------------------ -
N
P
NOTE
Noise
The harmonic sequence is limited to the 10
practice, the term P
80
(N)=Power of the noise; P
noise
+P + ... + P where H
H2 H3 Hi
Definition
(P –P
total signal
D
(P –P
total signal
Where THD is the total harmonic distortion
20  log [1/(P
D
10
P )1/2]
signal
Where SINAD is Signal-to-Noise-And-Distortion ratio
P / P
D
signal noise
Where SNR is the Signal-to-Noise Ratio. The approximation is per the
implementations defined with the HP/Keysight 8903A.
must be limited to the bandwidth of the applied filters.
includes Spurs, IMD, Hum, etc. (All but harmonics.)
noise
is the ith harmonic that counts up to the 10th
i
1/2 1/2
) /(P ) 100%
total
1/2 1/2
 100%
) /(P )
total
1/2
)] = 20  log
distortion
~ (P + P + P
signal noise distortion
th
harmonic unless otherwise indicated. In
(D) = Power of the
distortion
1/2
[(P ) (P –
/
10 total total
) / P
noise