MC13820 Datasheet, PDF (17/38 Pages) Freescale Semiconductor, Inc – Low Noise Amplifier with Bypass Switch

Application Information
3.3 2140 MHz Application
This application circuit was designed to provide NF < 1.3 dB, S21 gain > 16 dB, OIP3 of 18 dBm with
S11 better than -10 dB and S22 better than -10 dB at 2140 MHz with unconditional stability from 100 MHz
to 10 GHz. Typical performance that can be expected from this circuit at 2.75 V V_CC is listed in Table 8.
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
I_CC. Values of external resistors R1 and R2 are varied to adjust I_CC and IP3.
NC
NC
NC
12
11
10
NC 1
C5
C6
.01uf 33 pf
Vcc1
2
LNA
OUT
C2
0.9pf
L2
2.7 nH
3
R2
3.3 k
MC13820
9
2140 MHz LNA
8
Logic
7
C3
33 pf
C4
.01uf
Vcc3
4
R1
2k
Rbias
5
6
L1
4.3 nH
C1
33pF
LNA IN
Figure 11. 2140 MHz LNA Application Schematic
Gnd
Gain
Enable
Table 8. Typical 2140 MHz LNA Demo Board Performance
(Resistor values of R1 and R2 are changed for different I_CC and IP3 requirements.)
Characteristic
Symbol
Min
Typ
Max
R1 = 1.2 kΩ, R2 = 3.3 kΩ
Frequency
Power Gain
High Gain
Bypass
Output Third Order Intercept Point
High Gain
Bypass
Input Third Order Intercept Point
High Gain
Bypass
f
G
OIP3
IIP3
-
2140
-
-
15.7
-
-
-3.4
-
-
20.7
-
-
16.4
-
-
5.0
-
-
20
-
Unit
MHz
dB
dBm
dBm
MC13820 Technical Data, Rev. 1.1
Freescale Semiconductor
17