OQ2538HP_97 PHILIPS [NXP Semiconductors], OQ2538HP_97 Datasheet - Page 11

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

Philips Semiconductors
the denominator is present to compensate for the fact
that S
differential power gain is applicable in this situation. N
be replaced with the available noise power at the input,
which is kT under matched conditions (k is Boltzmann’s
constant). The formula expressed in dBm makes
calculation easier:
1997 Nov 26
F
handbook, full pagewidth
SDH/SONET main amplifier
=
-----------------
S
termination
S
50
21
o
i
is the single-ended power gain, whereas the
N
N
SMA
termination
50
i
o
=
SMA
-------------------------- -
2 S
F
N
21
o
=
N
N
o
i
–
50
50
=
--------------------------- -
2 S
S
semi rigid
semi rigid
21
+
N
21
o
3
kT
100
+
Fig.10 Noise figure measurement set-up.
173.8
The factor 2 in
dB
100 pF
100 pF
100
i
,
can
IN
INQ
V EE = 4.5 V
11
OQ2538HP
test PCB
assuming log(kT) is 173.8 dBm (T = 298k) and N
measured in 1 Hz bandwidth and expressed in dBm. For
the OQ2538HP, in the differential configuration (including
the 100
figure of 11 dB.
While the performance of this measurement set-up cannot
match that of a dedicated noise analysis system, the
results are comparable for an amplifier with a noise figure
of 11 dB.
OUTQ
OUT
100
matching resistors), this yields a typical noise
IN
Z o = 50
100
SPECTRUM
ANALYZER
50
50
semi rigid
semi rigid
Preliminary specification
OQ2538HP
50
termination
MGM112
SMA
o