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MC13821 Scheda tecnica(PDF) 11 Page - Freescale Semiconductor, Inc

Il numero della parte MC13821
Spiegazioni elettronici  Low Noise Amplifier with Bypass Switch
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Produttore elettronici  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC13821 Scheda tecnica(HTML) 11 Page - Freescale Semiconductor, Inc

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Application Information
MC13821 Data Sheet: Technical Data, Rev. 1.5
Freescale Semiconductor
11
Application information for 1575, 1960, 2140 and 2400 MHz are shown. For each application, two current
drain examples are provided. Typical RF performance is shown for two values of bias resistor R1: 1.2 k
Ω
and 2 k
Ω, see Table 6, Table 7, Table 8, and Table 9. These two current drain states offer variation in
intercept point, gain, and noise figure. For 1960 and 2140 MHz, additional application circuits are shown.
These demonstrate specific performance characteristics and utilize varying input and output matches and
different biasing resistors.
Measurements are made at a bias of VCC = 2.75 V. Freq. spacing for IP3 measurements is 200 kHz.
Non-linear measurements are made at Pin = -30 dB. The board loss corrections for these boards are: Input
0.16 dB, Output 0.2 dB. Gain and NF results incorporate these corrections in order to better reflect the
actual performance of the device.
3.1
1575 MHz Application
This application circuit was designed to provide NF < 1.2 dB, S21 gain > 18 dB, OIP3 of 18 dBm with
S11 better than -10 dB and S22 better than -10 dB at 1575 MHz with unconditional stability from 100 MHz
to 10 GHz. Typical performance that can be expected from this circuit at 2.75 V VCC is listed in Table 6.
The component values can be changed to enhance the performance of a particular parameter, but usually
at the expense of another. Two variations of the circuit are realized for different requirements for IP3 and
ICC. Values of external resistors R1 and R2 are varied to adjust ICC and IP3.
Figure 9. 1575 MHz LNA Application Schematic
2
1
3
4
5
6
12
11
10
8
9
7
Gnd
LNA
OUT
R1
2 k
LNA IN
Gain
Enable
Vcc1
R2
680
MC13821
1575 MHz
LNA
L1
5.6 nH
C1
22pF
C2
1
pf
L2
5.6 nH
C3
33 pf
C4
.01uf
Rbias
Vcc3
C5
.01uf
C6
33 pf
Logic
N
C
NC
NC
NC


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