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ALM-1812-BLKG

P1-P3P4-P6P7-P9P10-P12P13-P15
4
Vsd
RFin RFout
Vdd
Vdd (Pin 10)
C1
Filter
Filter
LNA
50-Ohms TL 50-Ohms TL
L2
C2
R1
L1
R2
C3
Vsd (Pin 12)
Filter
Filter
LNA
Figure 2. Demoboard and application schematic diagram
Notes
1. The module is fully matched at the input and output RF pins. The RFin pin is directly connected to a shunt inductor that is grounded. The RF output
lter blocks DC. Best noise performance is obtained using high-Q wirewound inductors. This circuit demonstrates that low noise gures are
obtainable with standard 0402 chip inductors.
2. C2 and L2 form a matching network that a ects the frequency response and linearity of the LNA, these can be tuned to optimize gain and return
loss.
3. L1 and R1 isolates the demoboard from external disturbances during measurement. It is not needed in actual application. Likewise, C1 and C3
mitigate the e ect of external noise pickup on the Vdd and Vsd lines respectively. These components are not required in actual operation.
4. Bias control is achieved by either varying the Vsd voltage with/ without R2, or  xing the Vsd voltage to Vdd and adjusting R2 for the desired
current.
5
-120
-100
-80
-60
-40
-20
0
20
40
0 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 4
Freq (GHz)
-30
-25
-20
-15
-10
-5
0
5
10
Gain (dB)
Input RL
Output RL
Cell band
> 90 dBc
PCS band
> 85 dBc
-120
-100
-80
-60
-40
-20
0
20
40
0 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 4
Freq (GHz)
-30
-25
-20
-15
-10
-5
0
5
10
Cell band
> 90 dBc
PCS band
> 85 dBc
-100
-80
-60
-40
-20
0
20
1.5 1.52 1.54 1.56 1.58 1.6 1.62 1.64
Freq (GHz)
Gain (dB)
-50
-40
-30
-20
-10
0
10
Return loss (dB)
-100
-80
-60
-40
-20
0
20
1.5 1.52 1.54 1.56 1.58 1.6 1.62 1.64
Freq (GHz)
Gain (dB)
-50
-40
-30
-20
-10
0
10
Return loss (dB)
Gain (dB)
Return loss (dB)
Gain (dB)
Input RL
Output RL
Gain (dB)
Input RL
Output RL
Gain (dB)
Return loss (dB)
Gain (dB)
Input RL
Output RL
ALM-1812 Typical Performance Curves at 25°
Figure 3a. Typical S-Parameter Plot @ Vdd = 2.8V, Idd = 6.8mA Figure 3b. Passband response of typical S-Parameter Plot @ Vdd = 2.8V,
Idd = 6.8mA
Figure 4a. Typical S-Parameter Plot @ Vdd = 1.8V, Idd = 4mA Figure 4b. Passband response of typical S-Parameter Plot @ Vdd = 1.8V,
Idd = 4mA
6
0
2
4
6
8
10
12
14
0 5 10 15 20 25 30 35 40
Rbias (kohm)
Vdd=2.8V
Vdd=1.8V
0
1
2
3
4
5
6
7
8
9
0 0.5 1 1.5 2 2.5 3 3.5 4
Vsd (V)
0
1
2
3
4
5
6
7
8
9
0 0.5 1 1.5 2 2.5 3 3.5 4
Vsd (V)
1.0
1.5
2.0
2.5
3.0
234567891011
Idd (mA)
1.0
1.5
2.0
2.5
3.0
234567891011
Idd (mA)
-40
25
85
Idd (mA)
Idd (mA)
Idd (mA)
NF (dB)
NF (dB)
-40
25
85
ALM-1812 Typical Performance Curves at 25°C, R2 = 3.9kOhm
Figure 5. Idd vs Rbias at 25°C Figure 6. Idd vs Vsd for Vdd = 2.8V, R2 = 3.9k Ohm
Figure 7. Idd vs Vsd for Vdd = 1.8V, R2 = 3.9k Ohm Figure 8. NF vs. Idd at Vdd = 2.8V
Figure 9. NF vs Idd at Vdd = 1.8V
P1-P3P4-P6P7-P9P10-P12P13-P15

ALM-1812-BLKG

Mfr. #:
Buy ALM-1812-BLKG
Manufacturer:
Broadcom / Avago
Description:
RF Front End GPS LNA with Filter
Lifecycle:
New from this manufacturer.
Delivery:
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