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SiGe High-Linearity, 2000MHz to 3000MHz
Upconversion/Downconversion Mixer with LO Buffer
Layout Considerations
A properly designed PCB is an essential part of any
RF/microwave circuit. Keep RF signal lines as short as
possible to reduce losses, radiation, and inductance.
For the best performance, route the ground pin traces
directly to the exposed pad under the package. The PCB
exposed pad MUST be connected to the ground plane
of the PCB. It is suggested that multiple vias be used to
connect this pad to the lower-level ground planes. This
method provides a good RF/thermal conduction path for
the device. Solder the exposed pad on the bottom of the
device package to the PCB.
Power-Supply Bypassing
Proper voltage-supply bypassing is essential for high-
frequency circuit stability. Bypass each V CC pin with the
capacitors shown in the Typical Application Circuit and
see Tables 1 and 2.
Exposed Pad RF/Thermal Considerations
The exposed pad (EP) of the MAX2042’s 20-pin thin QFN
package provides a low thermal-resistance path to the
die. It is important that the PCB on which the MAX2042
is mounted be designed to conduct heat from the EP. In
addition, provide the EP with a low-inductance path to
electrical ground. The EP MUST be soldered to a ground
plane on the PCB, either directly or through an array of
plated via holes.
Table 1. Downconverter Mode Component Values
DESIGNATION
C1
C2, C6, C8, C11
C3, C9
C5
C10
R1
T1
U1
QTY
1
4
0
0
1
1
1
1
DESCRIPTION
8.2pF microwave capacitor (0402)
0.01 F F microwave capacitors (0402)
Not installed, capacitors
Not installed, capacitor
2pF microwave capacitor (0402)
698 I Q 1% resistor (0402)
1:1 IF balun MABAES0029
MAX2042 IC (20 TQFN)
COMPONENT SUPPLIER
Murata Electronics North America, Inc.
Murata Electronics North America, Inc.
—
—
Murata Electronics North America, Inc.
Digi-Key Corp.
M/A-Com, Inc.
Maxim Integrated Products, Inc.
Table 2. Upconverter Mode Component Values
DESIGNATION
C1
C2, C6, C8, C11
C3, C9
C5
C10
R1
T1
U1
QTY
1
4
0
0
1
1
1
1
DESCRIPTION
8.2pF microwave capacitor (0402)
0.01 F F microwave capacitors (0402)
Not installed, capacitors
Not installed, capacitor
2pF microwave capacitor (0402)
698 I Q 1% resistor (0402)
1:1 IF balun MABAES0029
MAX2042 IC (20 TQFN)
COMPONENT SUPPLIER
Murata Electronics North America, Inc.
Murata Electronics North America, Inc.
—
—
Murata Electronics North America, Inc.
Digi-Key Corp.
M/A-Com, Inc.
Maxim Integrated Products, Inc.
______________________________________________________________________________________
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