High-Linearity, 815MHz to 1000MHz Upconversion/
Downconversion Mixer with LO Buffer/Switch
Typical Operating Characteristics (continued)
(Typical Application Circuit, L1 = 4.7nH, C4 = 4.7pF, C5 not used, V CC = +5.0V, P LO = 0dBm, P IF = 0dBm, f RF = f LO + f IF ,
f IF = 90MHz, unless otherwise noted.)
Upconverter Curves
LO LEAKAGE AT RF PORT vs. LO FREQUENCY
(L-C BPF TUNED FOR 940MHz RF FREQUENCY)
-10
LO LEAKAGE AT RF PORT vs. LO FREQUENCY
(L-C BPF TUNED FOR 940MHz RF FREQUENCY)
-10
LO LEAKAGE AT RF PORT vs. LO FREQUENCY
(L-C BPF TUNED FOR 940MHz RF FREQUENCY)
-10
-20
T C = +25 ° C
-20
-20
-30
T C = -40 ° C
-30
P LO = -3dBm, 0dBm, +3dBm
-30
V CC = 4.75V, 5.0V, 5.25V
-40
-50
T C = +85 ° C
-40
-50
-40
-50
730
780
830
880
930
730
780
830
880
930
730
780
830
880
930
LO FREQUENCY (MHz)
IF LEAKAGE AT RF vs. LO FREQUENCY
(L-C BPF TUNED FOR 940MHz RF FREQUENCY)
-50
-60
LO FREQUENCY (MHz)
IF LEAKAGE AT RF vs. LO FREQUENCY
(L-C BPF TUNED FOR 940MHz RF FREQUENCY)
-50
-60
LO FREQUENCY (MHz)
IF LEAKAGE AT RF vs. LO FREQUENCY
(L-C BPF TUNED FOR 940MHz RF FREQUENCY)
-50
-60
-70
T C = -40 ° C
T C = +25 ° C
-70
-70
P LO = 0dBm, +3dBm
V CC = 4.75V, 5.0V
-80
-90
-100
T C = +85 ° C
-80
-90
-100
P LO = -3dBm
-80
-90
-100
V CC = 5.25V
730
780
830
880
930
730
780
830
880
930
730
780
830
880
930
LO FREQUENCY (MHz)
LO FREQUENCY (MHz)
RF PORT RETURN LOSS vs. RF FREQUENCY
(L-C BPF TUNED FOR 940MHz RF FREQUENCY)
0
5
L1 AND C4 BPF INSTALLED
10
15
20
25
L1 AND C4 BPF REMOVED
30
THE L-C BPF ENHANCES PERFORMANCE
35
IN THE UPCONVERTER MODE BUT LIMITS
RF BANDWIDTH
40
LO FREQUENCY (MHz)
820
870
920
970
1020
RF FREQUENCY (MHz)
______________________________________________________________________________________
11
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