MC13821 Freescale Semiconductor, MC13821 Datasheet - Page 14

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

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Application Information
3.2
These application circuits are designed to demonstrate performance at 1960 MHz. By varying the value of
resistor R1, the current draw and the IP3 performance of the device can be tailored for a particular
application. Shown here are four variations of the circuit for different IP3 and I
and output matches are also changed on some circuits to demonstrate different NF and gain performance.
Typical performance that can be expected from this circuit at 2.75 V V
variations of the circuit utilize different matches. For all circuits the match consists of a highpass match on
the output and a simple inductor-capacitor network on the LNA input.
14
R1 = 1.2 kΩ, R2 = 3.3 kΩ
Frequency
Power Gain
Output Third Order Intercept Point
High Gain
Bypass
High Gain
Bypass
1960 MHz Application
Vcc1
OUT
LNA
Characteristic
(Resistor values of R1 and R2 are changed for different I
2.7 nH
.01uf
C5
L2
0.9pf
Table 7. Typical 1960 MHz LNA Demo Board Performance
C2
33 pf
Vcc3
C6
Figure 10. 1960 MHz LNA Application Schematic
NC
33 pf
.01uf
C3
C4
3.3 k
R2
MC13821 Data Sheet: Technical Data, Rev. 1.5
1
2
3
R1
2 k
Rbias
NC
12
4
Symbol
OIP3
G
f
1960 MHz
MC13821
LNA
NC
11
5
4.3 nH
L1
Minimum
NC
10
6
15
19
18
—
-6
Logic
CC
and IP3 requirements.)
33pF
C1
CC
Typical
is listed in
LNA IN
1960
20.5
-4.5
16
22
9
8
7
CC
requirements. The input
Freescale Semiconductor
Maximum
Table
Enable
Gain
Gnd
21.5
-3.5
17
23
—
7. Two
Unit
MHz
dBm
dB