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GPS/GNSS LNAs with Antenna Switch and Bias
Detailed Description
The MAX2674/MAX2676 are low-power LNAs designed
for GPS/GNSS receiver applications. The devices feature
low noise and high linearity in an ultra-small package.
They also include an antenna switch and circuitry sup-
porting bias to accommodate external LNA applications.
Input and Output Matching
To achieve optimal performance in noise figure, gain,
and IIP3, the devices require one matching inductor at
RFIN in series with a DC-blocking capacitor. RFOUT/
SHDN is internally matched to 50 I , eliminating the need
for external matching components. At RFOUT/ SHDN , an
external DC-blocking capacitor should be used to isolate
the shutdown control function.
Shutdown Mode
To place the device in shutdown mode, apply logic-low
to RFOUT/ SHDN through a 25k? resistor. An additional
DC-blocking capacitor or component is required at
RFOUT/ SHDN in this case. Apply a logic-high state or no
DC bias to turn the part permanently on.
DC Supply Decoupling and Layout
A properly designed PC board (PCB) is essential to any
RF microwave circuit. Use controlled-impedance lines
on all high-frequency inputs and outputs. Bypass V CC
with a decoupling capacitor located close to the device.
For long V CC lines, it may be necessary to add additional
decoupling capacitors. Locate these additional capaci-
tors further away from the device package.
Proper grounding of GND_ pins is essential. If the PCB
uses a top-side RF ground, connect it directly to the
GND_ pins. For a board where the ground is not on the
component layer, connect the GND_ pins to the board
with multiple vias close to the package.
Antenna Switch Control
The MAX2674/MAX2676 ANT input includes an autode-
tection feature. When no current is drawn from ANT, the
switch defaults to normal LNA operation. The pin can be
directly connected to an external active antenna. The
device automatically switches to the ANT input when an
external active antenna is connected.
Refer to www.maxim-ic.com for the MAX2674/MAX2676
EV Kit schematic, layout files, BOM information, and
S-parameters.
Table 1. MAX267 4 Typical Noise Parameters (V CC = 2.85V, T A = +25°C)
FREQUENCY (MHz)
1550
1560
1570
1580
1590
1600
NF MIN (dB)
0.651
0.652
0.654
0.655
0.656
0.657
GAMMA_OPT MAG ( ° )
0.446
0.445
0.445
0.444
0.444
0.443
GAMMA_OPT PHASE ( ° )
44.1
44.3
44.6
44.8
45.1
45.4
Rn ( I )
8.33
8.33
8.32
8.31
8.3
8.3
Table 2. MAX2676 Typical Noise Parameters (V CC = 2.85V, T A = +25°C)
FREQUENCY (MHz)
1550
1560
1570
1580
1590
1600
NF MIN (dB)
0.744
0.746
0.748
0.75
0.751
0.753
GAMMA_OPT MAG ( ° )
0.441
0.44
0.439
0.438
0.437
0.436
GAMMA_OPT PHASE ( ° )
53.1
53.4
53.7
54
54.3
54.7
Rn ( I )
8.7
8.68
8.66
8.65
8.63
8.62
7
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