MC13821 Freescale Semiconductor, MC13821 Datasheet - Page 10

• Manufacturer Part Number: MC13821
• Description: Low Noise Amplifier
• Manufacturer: Freescale Semiconductor

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Application Information
3
The MC13821 SiGe:C LNA is designed for applications in the 1000 MHz to 2.4 GHz range. It has three
different modes: High Gain, Low Gain (Bypass) and Disabled. The IC is programmable through the Gain
and Enable pins. The logic truth table is given in
In these application examples a balance is made between the competing RF performance characteristics of
I
input or output. Instead, matching which achieves a trade-off in RF performance qualities is utilized. For
a particular application or spec requirement, the matching can be changed to achieve enhanced
performance of one parameter at the expense of other parameters.
10
CC
, NF, gain, IP3 and return losses with unconditional stability. Conjugate matching is not used for the
Application Information
Figure 7. Input 3rd Order Intercept Point vs. Icc for the 1960 MHz Application Circuit
Figure 8. Input 3rd Order Intercept Point vs. Icc for the 2140 MHz Application Circuit
-1
-2
-2
-4
-6
6
5
4
3
2
1
0
6
4
2
0
MC13821 Data Sheet: Technical Data, Rev. 1.5
1.5
1
Input 3rd Order Intercept Point vs. Icc
Input 3rd Order Intercept Point vs. Icc
(Rbias varied from 1.2 kΩ to 3 kΩ)
(Rbias varied from 1.2 kΩ to 3 kΩ)
2140 MHz Application Circuit
1960 MHz Application Ckt.
2.5
2
Table
Icc (mA)
Icc (mA)
3.5
5.
3
4.5
4
5.5
5
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