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MAX2022
RF Demodulator
The MAX2022 can also be used as an RF demodulator
(see Figure 4 ), downconverting an RF input signal directly
to baseband. The single-ended RF input accepts signals
from 1500MHz to 3000MHz. The passive mixer architec-
ture produces a conversion loss of typically 9.2dB and a
noise figure of 9.4dB. The downconverter is optimized
for high linearity of typically +39dBm IIP3. A wide I/Q port
bandwidth allows the port to be used as an image-reject
mixer for downconversion to a quadrature IF frequency.
The RF and LO inputs are internally matched to 50?.
Thus, no matching components are required, and only
DC-blocking capacitors are needed for interfacing.
Demodulator Output Port Considerations
Much like in the modulator case, the four baseband ports
require some form of DC return to establish a common
mode that the on-chip circuitry drives. This is achieved
by directly DC-coupling to the baseband ports (staying
High-Dynamic-Range, Direct Up/
Downconversion 1500MHz to 3000MHz
Quadrature Modulator/Demodulator
within the -2.5V to +1.5V common-mode range), through
an inductor to ground, or through a low-value resistor to
ground. Figure 6 shows a typical network that would be
used to connect to each baseband port for demodulator
operation. This network provides a common-mode DC
return, implements a high-frequency diplexer to terminate
unwanted RF terms, and also provides an impedance
transformation to a possible higher impedance baseband
amplifier.
The network C a , R a , L a , and C b form a highpass/lowpass
network to terminate the high frequencies into a load
while passing the desired lower IF frequencies. Elements
L a , C b , L b , C c , L c , and C d provide a possible impedance
transformer. Depending on the impedance being trans-
formed and the desired bandwidth, a fewer number of ele-
ments can be used. It is suggested that L a and C b always
be used since they are part of the high-frequency diplexer.
If power matching is not a concern, then this reduces the
elements to just the diplexer.
MAX2022
DIPLEXER/
DC RETURN
MATCHING
ADC
RF
90
0
LO
DIPLEXER/
DC RETURN
MATCHING
ADC
Figure 4. MAX2022 Demodulator Configuration
I+
3dB PAD
DC BLOCK
0°
MINI-CIRCUITS
ZFSCJ-2-1
I-
3dB PAD
DC BLOCK
180°
3dB PADS LOOK LIKE 160? 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
www.maximintegrated.com
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