Wideband I/Q Modulator with Sigma-Delta
Fractional-N Synthesizer
Typical Operating Characteristics (continued)
(MAX2150 EV kit. V CC = +3V, SHDN = PLLEN = TXEN = high, BUFEN = low. Input I/Q signals: F I/Q = 500kHz, V I/Q = 1V P-P . I+, Q+
single-ended input, driven from AC-coupled source. I-, Q- single-ended inputs are AC-coupled to GND. RFOUT and BUFOUT output
ports are terminated in 50 Ω loads. f LO =1750MHz, P LO = -10dBm, T A = +25°C, unless otherwise noted.)
OSCIN PORT SENSITIVITY
(SYNTHESIZER) vs. FREQUENCY
OSCIN IMPEDANCE vs. FREQUENCY
6
5
-40 ° C
MAX2150 toc13
0.60
0.50
0
-100
-200
REAL
4
3
2
+25 ° C
+85 ° C
+25 ° C
+85 ° C
0.40
0.30
0.20
-300
-400
-500
-600
-700
IMAGINARY
1
-40 ° C
0.10
-800
-900
0
10
15
20
25
30
35
40
45
50
0
-1000
10
15
20
25
30
35
40
45
50
FREQUENCY (MHz)
SYNTHESIZER PHASE NOISE
FREQUENCY (MHz)
I/Q MODULATOR OUTPUT SPURS
0
0
MAX2150 toc16
-10
-8.5dBm
-10
CARRIER
SUPPRESSION
-20
-30
-40
-50
-60
-70
-80
-90
-100
CENTER = 1.75MHz
N/C = -99dBc/Hz
SPAN = 20kHz
-20
-30
-40
-50
-60
-70
-80
-90
-100
1 AVG
CENTER = 1.75 GHz
-34dBc
SIDEBAND
SUPPRESSION
-36dBc
SPAN = 2 MHz
_______________________________________________________________________________________
7
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