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MAX2021
High-Dynamic-Range, Direct Up-/Downconversion
650MHz to 1200MHz Quadrature Mod/Demod
L d
R a
C a
MAX2021
I/Q OUTPUTS
L a
C b
L b
C c
L c
R b
C d
C e
EXTERNAL
STAGE
Figure 4. Baseband Port Typical Filtering and DC Return Network
I+
3dB PAD
DC BLOCK
0°
MINI-CIRCUITS
ZFSCJ-2-1
I-
3dB PAD
DC BLOCK
180°
3dB PADS LOOK LIKE 160 I TO GROUND
AND PROVIDES THE COMMON-MODE
DC RETURN FOR THE ON-CHIP CIRCUITRY.
MINI-CIRCUITS
ZFSC-2-1W-S+
0° COMBINER
Q+
Q-
3dB PAD
3dB PAD
DC BLOCK
DC BLOCK
0°
MINI-CIRCUITS
ZFSCJ-2-1
180°
90°
Figure 5. Demodulator Combining Diagram
Power Scaling with Changes
to the Bias Resistors
Bias currents for the LO buffers are optimized by fine
tuning resistors R1, R2, and R3. Maxim recommends
using ±1%-tolerance resistors; however, standard ±5%
values can be used if the ±1% components are not
readily available. The resistor values shown in the
Typical Application Circuit were chosen to provide
peak performance for the entire 650MHz to 1200MHz
band. If desired, the current can be backed off from
this nominal value by choosing different values for R1,
R2, and R3. Tables 1 and 2 outline the performance
trade-offs that can be expected for various combina-
tions of these bias resistors. As noted within the tables,
the performance trade-offs may be more pronounced
for different operating frequencies. Contact the factory
for additional details.
Maxim Integrated
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 con-
duction path for the device. Solder the exposed pad on
the bottom of the device package to the PCB. The
MAX2021 evaluation kit can be used as a reference for
board layout. Gerber files are available upon request at
www.maximintegrated.com .
15
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