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PDF MGA-310G Data sheet ( Hoja de datos )
| Número de pieza | MGA-310G | |
| Descripción | GNSS Low Noise amplifier | |
| Fabricantes | AVAGO | |
| Logotipo |  |
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MGA-310G
GNSS Low Noise amplifier with Variable bias current
and shutdown function
Data Sheet
Description
Avago Technologies’ MGA-310G is an ultra low-noise
amplifier designed for GNSS band applications. The LNA
uses Avago Technologies’proprietary GaAs Enhancement-
mode pHEMT process to achieve high gain with very low
noise figures and high linearity. Noise figure distribution is
very tightly controlled. Gain and supply current are guar-
anteed parameters. A CMOS compatible shutdown pin is
included to turn the LNA off and provide variable bias.
The MGA-310G LNA is usable down to 1.8 V operation.
It achieves low noise figures and high gain even at 1.8 V,
making it suitable for use in critical low power GNSS band
applications.
Component Image
Surface Mount (1.13 x 1.1 x 0.5 mm3) 6-lead UQFN
Vdd (pin 6)
RF In (pin 1)
RF Out (pin 5)
GND (pin 2)
NC (pin 3)
TOP VIEW
Vsd (pin 4)
Vdd (pin 6)
RF Out (pin 5)
Vsd (pin 4)
NC
(pin 7)
RF In (pin 1)
GND (pin 2)
NC (pin 3)
BOTTOM VIEW
Note:
Package marking
provides orientation
and identification
“A” = Product code
“X” = Year/month code
Attention: Observe precautions for
handling electrostatic sensitive devices.
ESD Machine Model = 50 V
ESD Human Body Model = 250 V
Refer to Avago Application Note A004R:
Electrostatic Discharge, Damage and Control.
Features
Advanced GaAs E-pHEMT
Low Noise Figure: 0.82 dB typ.
High Gain: 15.2 dB typ.
Low external component count
High IIP3 and IP1dB
Wide Supply Voltage: 1 V to 3.6 V
Shutdown current : < 1 A
CMOS compatible shutdown pin (SD)
Adjustable bias current via single external resistor/
voltage
Small Footprint: (1.13 x 1.1 mm2)
Low Profile: 0.5 mm typ.
Meets MSL1, Lead-free and halogen free
Specifications (Targeted Typical performance @ 25° C)
At 1.575 GHz, Vdd = 2.7 V, Idd = 8.0 mA
Gain = 15.2 dB
NF = 0.82 dB
IIP3 = 1.8 dBm
IP1dB = 2.0 dBm
S11 = -9.5 dB, S22 =-14 dB
Application
LNA for GNSS frequency bands
Application Circuit
Vdd = +2.7 V
C1 C3
Vsd
RFin RFout
Downloaded from Elcodis.com electronic components distributor
1 page  
Vdd = +2.7 V
L4 C3
Vsd R2 22 nH 0.1 μF
12 Ohm
C1
7pf L3
R1* 3.9 nH
4
1k
Vx
10k
Bias
6
C2
8.2 pF
RFin
L1
8.2 nH
L2
15 nH
1
LNA
2 37
NC NC
RFout
5
* R1 optional, see notes below
Figure 5. Application Circuit
DUT
Notes:
L1 and L2 form the input matching network. The LNA module has integrated coupling and DC-block capacitors at the input and output respectively.
Best noise performance is obtained using high-Q wirewound inductors. This circuit demonstrates that low noise figures are obtainable with
standard 0402 chip inductors.
L3 serves as an output matching inductor and supply choke.
C1, C2 and C3 are RF bypass capacitors. C1 are optional.
R2 and L4 form a network that isolates the measurement demoboard from external disturbances.
The LNA bias current is variable. This enables the LNA to be used for different applications and gives slightly different performance at different bias
currents. Best performance is obtained at higher currents. Typical bias is Vdd = 2.7 V, Idd = 8 mA.
How the bias works:
– Bias current of LNA is set by voltage at Vsd pin (pin 4).
– Voltage at Vsd pin can be varied by either:
i. connecting Vsd directly to a voltage source (R1 = 0 Ohm), or
ii. connecting Vsd to a voltage source with a series resistor (R1 in Figure 5). The external voltage can be Vdd. The voltage drop across resistor
R1 determines the voltage at pin 4. With example circuit of Figure 5 and R1= 8.2 kOhm, current draw by Vsd pin (Ish) is around 190 A.
– Figs 9, 10 and 11 show the different bias currents that can be obtained by varying Vsd and R1.
Higher gain and IP3 performance can be obtained by increasing the supply current. This can be achieved by reducing the value for R1 to obtain
desired current.
For low voltage operation such as 1.8 V, the R1 may be omitted and Vsd connected directly to the supply pins.
5
Downloaded from Elcodis.com electronic components distributor
5 Page 
MGA-310G RF performance @1.575GHz with 1710 MHz interferer signal at RF output, 25° C
Adjust power level of
Interferer frequency
@1710 MHz
Isolator
DC Power Supply ( Vdd & Vsd )
Input DUT (MGA-310G)
Narda Power
Combiner
Output
Figure 24. Setup diagram for measurement of RF performance with 1710 MHz interferer signal at RF output
Table 4. Measurement data for RF performance with 1710 MHz interferer signal at RF output
1710MHz
interferer power
level (dBm)
Freq (Hz)
Vd Vg Id Ig Idsh IIP3 IP1dB S11
(V) (V) (mA) (mA) (uA) (dBm) (dBm) (dB)
No interfering 1575000000 2.7 2.7 8.9 0.131 0.17 2.1 2.0 -9.8
signal
-11 1575000000 2.7 2.7 8.9 0.131 0.20 2.1 1.9 -9.8
-5 1575000000 2.7 2.7 8.8 0.131 0.32 2.1 1.9 -9.7
0 1575000000 2.7 2.7 8.7 0.131 0.78 2.0 1.7 -9.5
S22 S21
(dB) (dB)
-14.5 15.2
-14.5
-14.4
-14.2
15.2
15.1
15.1
S12 NF
(dB) (dB)
-22.3 0.84
-22.3
-22.2
-22.2
0.95
1.48
2.12
11
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| PDF Descargar | [ Datasheet MGA-310G.PDF ] | |
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