1.2GHz VCO with Linear
Modulation Input
Typical Operating Characteristics
(MAX2754 EV kit, V CC = +3.0V, V SHDN ≥ +2.0V, V TUNE = V MOD = +1.4V, and T A = +25°C, unless otherwise noted.)
1350
1300
VCO TUNING CURVE
-400
-420
MODULATION SENSITIVITY vs.
CARRIER FREQUENCY
1.0
TUNE INPUT CURRENT
vs. TEMPERATURE
1250
1200
1150
T A = -40 ° C
T A = +25 ° C
-440
-460
-480
T A = -40°C
0.8
0.6
-500
1100
-520
0.4
1050
1000
950
T A = +85 ° C
-540
-560
-580
T A = +85°C
T A = +25°C
0.2
0
0.5
1.0
1.5
2.0
2.5
3.0
-600
0
V TUNE (V)
1140
1160
1180
1200
1220
1240
1260
-40
-15
10
35
60
85
CARRIER FREQUENCY (MHz)
TEMPERATURE ( ° C)
-3.0
OUTPUT POWER vs. FREQUENCY
-2
OUTPUT POWER
vs. FREQUENCY
NORMALIZED HARMONIC
OUTPUT SPECTRUM
-3.5
-4.0
V CC = +5.5V
-3
-4
T A = +85°C
? = -20dBc
? = -30dBc
-4.5
-5.0
V CC = +4.0V
-5
-6
T A = +25°C
-5.5
V CC = +2.7V
-7
T A = -40°C
-6.0
1140
1160
1180
1200
1220
1240
1260
-8
FREQUENCY (MHz)
1140
1160
1180
1200
1220
1240
1260
? O
2? O
3? O
FREQUENCY (MHz)
OSCILLATOR TURN-ON/
FREQUENCY
-60
-70
PHASE NOISE
0
-10
TURN-OFF TIME
0
OUTPUT S 11
-80
-90
-100
-20
-30
-40
SHDN LOW-TO-HIGH
AT TIME = 0
-5
-110
-120
-130
-140
-150
-160
-50
-60
-70
-80
-90
-100
SHDN HIGH-TO-LOW
AT TIME = 0
-10
-15
-20
10
100
1000
10,000
0
10
20
30
40
50
800 900 1000 1100 1200 1300 1400 1500 1600
OFFSET FREQUENCY (kHz)
TIME ( μ s)
FREQUENCY (MHz)
4
_______________________________________________________________________________________
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