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PDF OQ2538U Data sheet ( Hoja de datos )
| Número de pieza | OQ2538U | |
| Descripción | SDH/SONET STM16/OC48 main amplifiers | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
OQ2538HP; OQ2538U
SDH/SONET STM16/OC48 main
amplifiers
Product specification
Supersedes data of 1997 Nov 26
File under Integrated Circuits, IC19
1998 Oct 14
1 page  
Philips Semiconductors
SDH/SONET STM16/OC48 main amplifiers
Product specification
OQ2538HP; OQ2538U
handbook, full pagewidth
VEE 1
n.c. 2
AGC 3
GND 4
GND 5
INQ 6
GND 7
IN 8
GND 9
GND 10
n.c. 11
VEE 12
OQ2538HP
36 VEE
35 n.c.
34 GND
33 GND
32 OUT
31 GND
30 OUTQ
29 GND
28 GND
27 n.c.
26 n.c.
25 VEE
MGE744
Fig.2 Pin configuration.
1998 Oct 14
5
5 Page 
Philips Semiconductors
SDH/SONET STM16/OC48 main amplifiers
Product specification
OQ2538HP; OQ2538U
Noise figure measurements
The noise figure is the ratio of signal-to-noise ratio at the
input (Si/Ni) to signal-to-noise ratio at the output (So/No) of
the amplifier. This definition is true for both single-ended
and differential amplifiers, provided the correct values for
Si/Ni and So/No are substituted in the formula. The noise
figure is measured using the differential set-up shown in
Fig.10. The total noise on the output (No in dBm) is
measured using the spectrum analyzer at the frequency of
interest. From this value, the actual (differential) noise
figure for that frequency (spot noise figure) can be
calculated using the following formula:
F = S--S---o-i---⁄⁄--NN-----io- = 2-----⋅---S---N--2--1o----⋅---N----i = -2----⋅---S---N--2--1-o---⋅---k----T--
The factor 2 in the denominator is present to compensate
for the fact that S21 is the single-ended power gain,
whereas the differential power gain is applicable in this
situation. Ni can 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:
F = No – (S21 + 3) + 173.8 [dB],
assuming log(kT) is −173.8 dBm (T = 298 K) and
No measured in 1 Hz bandwidth and expressed in dBm.
For the OQ2538HP, in the differential configuration
(including the 100 Ω matching resistors), this yields a
typical noise 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.
handbook, full pagewidth
50 Ω SMA
termination
50 Ω SMA
termination
50 Ω semi rigid
50 Ω semi rigid
100 Ω
SPECTRUM
ANALYZER
IN
100 pF
OQ2538HP
test PCB
IN OUT
100 pF
INQ
OUTQ
100 Ω
100 Ω
VEE = −4.5 V
Zo = 50 Ω
50 Ω semi rigid
50 Ω semi rigid
100 Ω
50 Ω SMA
termination
MGM112
1998 Oct 14
Fig.10 Noise figure measurement set-up.
11
11 Page | ||
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| PDF Descargar | [ Datasheet OQ2538U.PDF ] | |
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