uaa1570hl NXP Semiconductors, uaa1570hl Datasheet - Page 15

• Manufacturer Part Number: uaa1570hl
• Description: Global Positioning System Gps Front-end Receiver Circuit
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.1.2
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
of the board right at this output pin allows a stub or chip capacitance to be added without comprising the characteristics
of the 97
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
1999 May 10
handbook, full pagewidth
Global Positioning System (GPS) front-end
receiver circuit
LNA1OUT
matching line.
j
j
0
0.2
0.2
Fig.5 LNA1 output impedance and matching network.
0.2
0.5
0.5
0.5
15
1
1
1
2
match at high gain. A via to the opposite side
5
2
2
10
MHB319
5
5
10
10
UAA1570HL
Product specification