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參數(shù)資料
| 型號(hào)： | UAA1570HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Global Positioning System (GPS)baseband processor(通用定位系統(tǒng)基帶處理器) |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP48 |
| 封裝： | PLASTIC, SOT-313, LQFP-48 |
| 文件頁(yè)數(shù)： | 15/76頁(yè) |
| 文件大?。?/td> | 890K |
| 代理商： | UAA1570HL |
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1999 May 10
15
Philips Semiconductors
Product specification
Global Positioning System (GPS) front-end
receiver circuit
UAA1570HL
7.1.2
LNA1OUT
To facilitate matching of both LNA outputs, a small shunt capacitance should be placed as close as possible to the output
pin pad increasing the assumed 0.25 pF lumped pin capacitance by approximately 0.5 pF to 0.75 pF. This ensures that
a simple, short, high impedance transmission line will provide a good 50
match at high gain. A via to the opposite side
of the board right at this output pin allows a stub or chip capacitance to be added without comprising the characteristics
of the 97
matching line.
CAP 1 0 C = 0.25 ! C22 C = PF
IND 1 28 L = 0.7 ! L7 = NH
CAP 28 0 C = 7.1658792e
1 ! C23 C = PF
TLIN 28 29 Z = 97.0 E = 26.239010 F = 1.57542 ! TL15
If an open line stub is used, the latter components have to be replaced by:
TLOC 28 0 Z = 20.0 E = 8.0 F = 1.57542 ! OTL7 Z = OH, E = DEG, F = GHZ
TLIN 28 30 Z = 97.0 E = 26.2 F = 1.57542 ! TL16 Z = OH, E = DEG, F = GHZ
Fig.5 LNA1 output impedance and matching network.
handbook, full pagewidth
MHB319
0.2
0.5
1
2
5
0.2
0.5
1
2
5
10
10
0
0.2
0.5
1
2
5
10
+
j
j
∞
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