參數(shù)資料
型號(hào)： 935262358026
廠商： NXP SEMICONDUCTORS
元件分類： 數(shù)字傳輸電路
英文描述： ATM/SONET/SDH SUPPORT CIRCUIT, UUC36
封裝： DIE-36
文件頁(yè)數(shù)： 29/30頁(yè)
文件大小： 179K
代理商： 935262358026
2000 Sep 29
8
Philips Semiconductors
Product specication
SDH/SONET STM16/OC48 main ampliers
OQ2538HP; OQ2538U
RF gain and group delay measurements
The measurement set-up shown in Fig.7 was used to
measure the single-ended small signal gain as specified in
Chapter “Characteristics”. Since the network analyzer can
only perform single-ended measurements, the
single-ended matching scheme described above is used
to match the inputs of the OQ2538HP to 50
. For greater
accuracy, the outputs are also matched. The gain
measured with this set-up is denoted by S21. Graphs of
typical S21 and group delay characteristics are shown in
Figs 8 and 9. The OQ2538HP test PCB used for these
measurements can be supplied on request.
Although the differential voltage gain of the OQ2538HP
cannot be measured directly, it can be calculated from S21.
The differential voltage gain is 6 dB greater than the
measured S21 value, typically 46 dB (40 + 6 dB). If the
100
matching resistors on the output are omitted, the
differential voltage gain is increased by a further 2.4 dB,
typically to 48.4 dB. This is due to the fact that the output
load is increased from 25 to 33
, so the output voltage is
increased by a factor of 1.32 (2.4 dB).
When performing S21 measurements make sure the input
power level is around
50 dBm, as indicated in Fig.7
(port 1 of the network analyzer). For correct measurement
results the OQ2538 should not be limiting the input signal,
but operate in its linear region. This can be achieved by
using a very small input signal level of
50 dBm.
Fig.7 S21 and group delay measurement set-up.
handbook, full pagewidth
MGM111
100
50
SMA
termination
IN
INQ
OUT
OUTQ
100 pF
50
semi rigid
100
100
100
50
SMA
termination
50
semi rigid
50
semi rigid
50
semi rigid
OQ2538HP
test PCB
P = 50 dBm
S-PARAMETER TEST SET
6 GHz NETWORK ANALYZER
PORT 1
PORT 2
VEE = 4.5 V
Zo = 50
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