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PDF ALM-1912 Data sheet ( Hoja de datos )
| Número de pieza | ALM-1912 | |
| Descripción | GPS Filter-LNA Front-End Module | |
| Fabricantes | AVAGO | |
| Logotipo |  |
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ALM-1912
GPS Filter–LNA Front–End Module
Data Sheet
Description
Avago Technologies’ ALM-1912 is a GPS front-end module
that combines a GPS FBAR filter with high-gain low-noise
amplifier (LNA).The LNA uses Avago Technologies’ pro-
prietary GaAs Enhancement-mode pHEMT process to
achieve high gain with very low noise figure and high
linearity. Noise figure distribution is very tightly controlled.
A CMOS-compatible shutdown pin is included either for
turning the LNA on/off or for current adjustment. The
filter use Avago Technologies’ leading-edge FBAR filter for
low GPS band insertion loss and exceptional rejection at
Cellular, PCS and WLAN band frequencies.
The low noise figure and high gain, coupled with low current
consumption make it suitable for use in critical low-power
GPS applications or during low-battery situations.
Component Image
Surface Mount 2.9 x 2.0 x 0.95 mm3 9-lead MCOB
RF In (pin 1)
Gnd
(pin 9)
Vsd
(pin 8)
Vdd (pin 7)
Gnd (pin 2)
1912
WWYY
Gnd
(pin 3)
Gnd
(pin 4)
Top View
RF Out (pin 6)
NC (pin5)
Vdd (pin 7)
Vsd
(pin 8)
Gnd
(pin 9)
RF In (pin 1)
RF Out (pin 6)
NC (pin 5)
Gnd
(pin 4)
Gnd
(pin 3)
Gnd (pin 2)
Bottom View
Note:
Package marking provides orientation and identification
“1912” = Product Code
“YY” = Year of manufacture
“WW” = Work week of manufacture
Features
• Very Low Noise Figure
• Exceptional Cell/PCS/WLAN-Band rejection
• Low external component count
• Fully-matched at RF input and RF output
• Shutdown current : < 1 uA
• CMOS compatible shutdown pin (SD)
• ESD : > 3kV at RFin pin
• 2.9 x 2.0 x 0.95 mm size
• Adjustable bias current via single external resistor/
voltage
• Lead-free and Halogen free
Specifications (Typical performance @ 25°C)
At 1.575GHz, Vdd = 2.7V, Idd = 6mA
• Gain = 19.3 dB
• NF = 1.62 dB
• IIP3 = +1.5 dBm
• IP1dB = -8 dBm
• S11 = -9.5 dB
• S22 =-13.5 dB
• Cell-Band Rejection: > 57dBc
• PCS-Band Rejection: > 53dBc
• WLAN-Band Rejection: > 52dBc
Application
• GPS Front-end Module
Application Circuit
VBias
RBias
+Vdd = 2.7V
L
RFin
GPS
Filter
LNA
RFout
1 page  
Vdd (Pin 7)
R1 L1
C2 L2
Vdd
C1
50-Ohms TL
GPS
Filter
LNA
RFin (Pin 1)
50-Ohms TL
RFout (Pin 6)
(Pin 2, 3, 4, 5, 9)
Vsd (Pin 8)
Vsd
R2
C3
Figure 3. Demoboard and application schematic diagram
Notes
• The module is fully matched at the input and output RF pins. Both these pins also have built-in coupling and DC-blocking capacitors. Best noise
performance is obtained using high-Q wirewound inductors. This circuit demonstrates that low noise figures are obtainable with standard 0402
chip inductors.
• C2 and L2 form a matching network that affects the frequency response and linearity of the LNA, these can be tuned to optimize gain and return
loss.
• L1 and R1 isolates the demoboard from external disturbances during measurement. It is not needed in actual application. Likewise, C1 and C3
mitigate the effect of external noise pickup on the Vdd and Vsd lines respectively. These components are not required in actual operation.
• Bias control is achieved by either varying the Vsd voltage with/without R2, or fixing the Vsd voltage to Vdd and adjusting R2 for the desired current.
R2 = 4.7Kohm will result 6mA when Vdd = Vsd = 2.7V. R2 = 2.7Kohm for 4mA when Vdd = Vsd = 1.8V & R2 = 15Kohm for 4mA when Vdd = Vsd =
2.8V.
5
5 Page 
ALM-1912 Scattering Parameter and Measurement Reference Planes
Vdd (Pin 7)
R1 L1
C2 L2
Vdd
C1
(Pin 1)
GPS
FILTER
LNA
(Pin 6)
REFERENCE
PLANE
(Pin 2, 3, 4, 5, 9)
Vsd (Pin 8)
Vsd
R2
C3
Figure 27. Scattering parameter measurement reference planes
MODULE
REFERENCE
PLANE
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet ALM-1912.PDF ] | |
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