OQ2538HP_97 PHILIPS [NXP Semiconductors], OQ2538HP_97 Datasheet - Page 10

• Manufacturer Part Number: OQ2538HP_97
• Description: SDH/SONET main amplifier
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Noise figure measurements
The noise figure is the ratio of signal-to-noise ratio at the input (S
amplifier. This definition is true for both single-ended and differential amplifiers, provided the correct values for S
S
noise on the output (N
the actual (differential) noise figure for that frequency (spot noise figure) can be calculated using the following formula:
1997 Nov 26
handbook, full pagewidth
o
/N
SDH/SONET main amplifier
Vertical scale 200 ps/division.
Linear frequency sweep: start: 30 kHz; stop: 6 GHz.
(1) 832.91 ps; 1 GHz.
(2) 1007.4 ps; 3.45 GHz.
(3) 834 ps; 2 GHz.
(4) 860.93 ps; 2.5 GHz.
o
0 ps
are substituted in the formula. The noise figure is measured using the differential set-up shown in Fig.10. The total
S 21
start: 30 kHz
delay
o
Fig.9 Group delay characteristic, measured on the OQ2538HP test PCB.
in dBm) is measured using the spectrum analyzer at the frequency of interest. From this value,
(1)
(3)
(4)
10
i
/N
(2)
i
) to signal-to-noise ratio at the output (S
Preliminary specification
stop: 6 GHz
OQ2538HP
MGM161
o
/N
o
i
) of the
/N
i
and