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GPS/GNSS Low-Noise Amplifiers
Pin Description
BUMP
A1
A2
B1
B2
C1, C2
NAME
SHDN
RFOUT
RFIN
V CC
GND
FUNCTION
Shutdown Input. A logic-low disables the device.
RF Output. RFOUT is internally matched to 50 Ω and incorporates an internal DC-blocking capacitor.
RF Input. Requires a DC-blocking capacitor and external matching components.
Supply Voltage. Bypass to ground with a 33nF capacitor as close as possible to the IC.
Ground. Connect to the PCB ground plane.
Detailed Description
The MAX2657/MAX2658 are LNAs designed for GPS
L1, Galileo, and GLONASS applications. The devices
feature a power-shutdown control mode to eliminate the
need for an external supply switch. The devices
achieve a high gain and an ultra-low-noise figure.
Input and Output Matching
The MAX2657/MAX2658 require an off-chip input match-
ing. Only an inductor in series with a DC-blocking capac-
itor is needed to form the input matching circuit. The
Typical Application Circuit shows the recommended
input-matching network. These values are optimized for
the best simultaneous gain, noise figure, and return
loss performance. Tables 1 and 2 list typical device S
parameters and K f values. The MAX2657/MAX2658
integrate an on-chip output matching to 50 Ω at the out-
put, eliminating the need for external matching compo-
nents. The value of the input coupling capacitor affects
Shutdown
The MAX2657/MAX2658 include a shutdown feature to
turn off the entire chip. Apply a logic-high to the SHDN
pin to place the part in the active mode, and a logic-low
to place the part in the shutdown mode.
Applications Information
A properly designed PCB is essential to any RF
microwave circuit. Use controlled-impedance lines on
all high-frequency inputs and outputs. Bypass V CC with
decoupling capacitors located close to the device. For
long V CC lines, it may be necessary to add decoupling
capacitors. Locate these additional capacitors further
away from the device package. Proper grounding of
the GND pins is essential. If the PCB uses a topside 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.
IIP3. A smaller coupling capacitor results in lower IIP3.
Table 1. MAX2657 Typical S-Parameter Values and K-Factor
FREQ.
(MHz)
1000
1100
1200
1300
1400
1500
1575
1600
1700
1800
1900
2000
S11 MAG
(dB)
-2.0
-2.1
-2.2
-2.4
-2.7
-6.5
-4.3
-4.6
-5.4
-5.2
-4.8
-4.5
S11
PHASE
(Degrees)
-47.7
-48.6
-51.6
-55.0
-58.6
-61.9
-62.3
-61.6
-55.3
-49.8
-47.3
-46.7
S21 MAG
(dB)
6.0
7.4
9.6
12.0
14.0
16.2
17.1
17.3
17.1
15.7
13.9
12.7
S21
PHASE
(Degrees)
-100.0
-100.6
-107.3
-117.2
-129.5
-146.5
-164.2
-170.6
165.5
145.8
135.2
127.3
S12 MAG
(dB)
-47.5
-45.7
-42.9
-39.6
-37.0
-34.1
-32.9
-32.8
-32.5
-33.8
-35.2
-36.7
S12
PHASE
(Degrees)
-148.0
-150.0
-153.5
-160.2
-168.5
178.5
162.8
156.6
136.5
121.6
113.8
109.6
S22 MAG
(dB)
-1.0
-1.0
-1.4
-2.1
-3.6
-7.4
-15.3
-20.6
-9.5
-4.5
-2.7
-1.8
S22
PHASE
(Degrees)
-55.0
-58.1
-65.4
-74.1
-85.5
-100.0
-100.8
-78.9
10.0
-2.4
-13.2
-21.2
K f
5.1
3.8
3.1
2.5
2.3
2.8
2.1
2.0
1.8
1.6
1.6
1.5
6
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MAX2659ELT/V+ 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
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