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參數(shù)資料
| 型號(hào)： | OQ2538HP |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | SDH/SONET STM16/OC48 main amplifiers(SDH/SONET STM16/OC48主要放大器) |
| 中文描述： | ATM/SONET/SDH SUPPORT CIRCUIT, PQFP48 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-313-2, LQFP-48 |
| 文件頁(yè)數(shù)： | 12/15頁(yè) |
| 文件大?。?/td> | 277K |
| 代理商： | OQ2538HP |
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May 1996
12
Philips Semiconductors
Application note
SDH/SONET main amplifier
OQ2538HP
FUNCTIONAL TEST: FREQUENCY RESPONSE AND NOISE FIGURE
.
Linear (Small Signal) Gain:
To verify gain and bandwidth, measure the forward transmission S21with a 2-port vector
network analyser as shown in figure 1. The input power level of the analyser should be set to -50 dBm. Make sure, that
the network analyser is calibrated for this power level. The S21 should be around 40dB with a bandwidth of about 3 GHz.
NOTE that the input matching network reduces the overall gain of this configuration by 3dB if compared to the gain of
the IC only.
Noise Figure:
A spectrum analyzer must be connected to the 2nd output (OUTQ) to measure the output noise spectrum.
If ‘N0’ represents the noise level measured by spectrum analyzer in 1Hz bandwidth and expressed in dBm, the noise
figure can be evaluated acc. to the equation below.
NF=N0-(S21+3)+173.8 dB
Due to the input matching network, the gain that is measured with the network analyzer is 3 dB lower than the real
amplifier gain. This must be accounted in the noise figure calculation by adding 3 dB to the measured S21. Note further
that log(kT) is 173.8 dBm
NETWORK ANALYZER
PORT 1
PORT 2
S-PARAMETER TEST SET
DC Block
VEE
Z
O
=50
Z
O
=50
OQ2538HP
DEMO BOARD
50
Termination
DC Block
IN
INQ
OUT
OUTQ
IN
Spectrum
Analyzer
Fig 1. Functional test set up: frequency response and noise figure
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| OQ2538HP_97 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:SDH/SONET main amplifier |
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