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参数资料
| 型号： | MC13917-900EVK |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 24/40页 |
| 文件大小： | 0K |
| 描述： | IC MC13917_900_EVK |
| 标准包装： | 1 |
| 类型： | 放大器 |
| 频率： | 900MHz |
| 适用于相关产品： | MC13917 |
| 已供物品： | 板 |
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Application Circuits
4
Application Circuits
The MBC13917 LNA is designed for applications in the 100 MHz to 2.5 GHz range. In the application
examples included in this section, a balance is made between competing RF performance characteristics
of Icc, NF, gain IP3, and return losses to demonstrate overall performance. Conjugate matching is not used
for the input or output.
Instead, matching that achieves a tradeoff in RF performance qualities is shown. For a particular
application or specification requirement, the matching can be changed to achieve enhanced performance
of one parameter (generally at the expense of other parameters). Application information for 350 MHz,
434 MHz, 900 MHz and 1900 MHz circuits is provided.
?
?
4.1
Section 3, “Scattering and Noise Parameters ” provides Smith charts with gain and noise circles for
each application frequency.
Section 5, “Printed Circuit Board and Bill of Materials ” provides the evaluation board layout and
Bill of Material for the circuits.
350 MHz–370 MHz Applications
This application circuit was designed to provide NF = 2.1 dB, S21 gain > 27 dB for 350 MHz. Return
losses and gain are similar for 350 MHz–370 MHz.
? Component C4 has the greatest impact on return losses, NF, and gain, by moving the input and
output on the Smith chart.
? Component L1 can be lowered to improve NF, by trading off S11 return loss.
? Gain, OIP3 and P1dBoutput can be increased, by decreasing the resistor value at the output
(without impacting NF or return losses).
This application is intended for a range of designs, including TETRA land mobile and base station
transceivers. Typical performance that can be expected from this circuit at 2.7V is listed in Table 10 .
Figure 16 is the 350 MHz–370 MHz application schematic with package pinouts and the circuit
component topology.
Vcc
RF IN
C1
47 pF
L1
39 nH
1
6
Gnd
L2
47 nH
C2
100 pF
C3
.1uF
Gnd
NC
2
3
5
4
NC
.
R1
24 ohm
C4
2.4 pF
C5
3 pF
RF
OUT
Figure 16. 350 MHz–370 MHz Application Schematic
MBC13917 Advance Information, Rev. 1.0
24
Freescale Semiconductor
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