
High-Linearity, 650MHz to 1000MHz Upconversion/
Downconversion Mixer with LO Buffer/Switch
Typical Operating Characteristics (continued)
(Typical Application Circuit, optimized for the 800MHz/900MHz cellular band (see Table 1) , C1 = 82pF, C5 = 2pF, L1 and C4 not used,
V CC = 5.0V, P LO = 0dBm, P RF = 0dBm, f LO > f RF , f IF = 160MHz, T C = +25°C, unless otherwise noted.)
Downconverter Curves
60
55
RF-TO-IF ISOLATION
vs. RF FREQUENCY
60
55
RF-TO-IF ISOLATION
vs. RF FREQUENCY
60
55
RF-TO-IF ISOLATION
vs. RF FREQUENCY
50
T C = +85 ° C
T C = +25 ° C
50
P LO = +3dBm
50
45
45
45
40
35
T C = -40 ° C, -25 ° C
40
35
P LO = -3dBm
P LO = 0dBm
40
35
V CC = 4.75V, 5.0V, 5.25V
30
30
30
800
850
900
950
1000
800
850
900
950
1000
800
850
900
950
1000
RF FREQUENCY (MHz)
RF PORT RETURN LOSS
vs. RF FREQUENCY
RF FREQUENCY (MHz)
IF PORT RETURN LOSS
vs. IF FREQUENCY
RF FREQUENCY (MHz)
IF PORT RETURN LOSS
vs. IF FREQUENCY
0
5
10
0
5
10
15
INCLUDES IF TRANSFORMER
0
5
10
15
INCLUDES IF TRANSFORMER
20
20
15
25
V CC = 4.75V, 5.0V, 5.25V
25
P LO = -3dBm, 0dBm, +3dBm
30
30
20
25
30
P LO = -3dBm, 0dBm, +3dBm
35
40
45
50
35
40
45
50
750
800
850
900
950
1000
1050
0
100
200
300
400
500
0
100
200
300
400
500
0
5
10
RF FREQUENCY (MHz)
LO SELECTED RETURN LOSS
vs. LO FREQUENCY
0
10
IF FREQUENCY (MHz)
LO UNSELECTED RETURN LOSS
vs. LO FREQUENCY
P LO = -3dBm, 0dBm, +3dBm
100
90
IF FREQUENCY (MHz)
SUPPLY CURRENT
vs. TEMPERATURE (T C )
V CC = 5.25V
15
20
25
30
35
40
P LO = +3dBm
P LO = -3dBm
P LO = 0dBm
20
30
40
50
60
80
70
60
V CC = 4.75V
V CC = 5.0V
800
900
1000
1100
1200
1300
800
900
1000
1100
1200
1300
-40
-15
10
35
60
85
LO FREQUENCY (MHz)
LO FREQUENCY (MHz)
TEMPERATURE ( ° C)
8
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