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High-Dynamic-Range, Direct Up-/Downconversion
1500MHz to 2500MHz Quadrature Mod/Demod
Typical Operating Characteristics (continued)
(MAX2023 Typical Application Circuit, V CC = 4.75V to 5.25V, GND = 0V, I/Q differential inputs driven from a 100 Ω DC-coupled source
(modulator), V BBI = V BBQ = 2.6V P-P differential (modulator), P RF = +6dBm (demodulator), I/Q differential output drives 50 Ω differential load
(demodulator), 0V common-mode input/output, P LO = 0dBm, 1500MHz ≤ f LO ≤ 2300MHz, 50 Ω LO and RF system impedance, R1 = 432 Ω ,
R2 = 562 Ω , R3 = 301 Ω , T C = -40°C to +85°C. Typical values are at V CC = 5V, f LO = 1850MHz, T C = +25°C, unless otherwise noted.)
80
DEMODULATOR INPUT IP2
vs. LO FREQUENCY
T C = +25°C
6
DEMODULATOR I/Q PHASE IMBALANCE
vs. LO FREQUENCY
DEMODULATOR I/Q AMPLITUDE IMBALANCE
vs. LO FREQUENCY
0.07
75
70
T C = +85 ° C
5
4
P LO = +3dBm
0.06
0.05
0.04
P LO = +3dBm
65
60
3
2
P LO = 0dBm
P LO = -3dBm
0.03
0.02
P LO = -6dBm
P LO = -3dBm
P LO = 0dBm
55
T C = -40°C
f 1 = f LO + 25MHz
f 2 = f LO + 26MHz
1
P LO = -6dBm
0.01
50
1.5
1.6
1.7 1.8 1.9 2.0 2.1
2.2
2.3
0
1.5
1.6
1.7 1.8 1.9 2.0 2.1
2.2
2.3
0
1.5
1.6
1.7 1.8 1.9 2.0 2.1
2.2
2.3
LO FREQUENCY (GHz)
LO PORT RETURN LOSS
10
12
14
LO FREQUENCY (GHz)
10
15
LO FREQUENCY (GHz)
RF PORT RETURN LOSS
16
18
20
22
24
26
28
30
P LO = +3dBm
P LO = 0dBm
P LO = -3dBm
P LO = -6dBm
20
25
30
35
40
P LO = -6dBm, -3dBm, 0dBm, +3dBm
1.5
1.6
1.7 1.8 1.9 2.0 2.1
2.2
2.3
1.5
1.6
1.7 1.8 1.9 2.0 2.1
2.2
2.3
LO FREQUENCY (GHz)
RF FREQUENCY (GHz)
9
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