Rainbow Electronics MAX19985A - Manual (Page 12)

MAX19985A
Dual, SiGe, High-Linearity, 700MHz to 1000MHz
Downconversion Mixer with LO Buffer/Switch
12 ______________________________________________________________________________________
INPUT P 1dB vs. RF FREQUENCY
(VARIOUS LO AND IF BIAS)
MAX19985A toc46
RF FREQUENCY (MHz)
INPUT P
1dB
(dBm)
900 800
10
8
14
6
12
16
4
700 1000
SEE TABLE 1 FOR RESISTOR AND I CC VALUES
1, 2, 3, 4
5
7 6
CONVERSION GAIN vs. RF FREQUENCY
(VARIOUS VALUES OF L3 AND L6)
MAX19985A toc47
RF FREQUENCY (MHz)
CONVERSION GAIN (dB)
900
L = L3 = L6
800
8
7
10
9
11
6
700 1000
L = 0 Ω, 7.5nH, 15nH, 30nH
INPUT IP3 vs. RF FREQUENCY
(VARIOUS VALUES OF L3 AND L6)
MAX19985A toc48
RF FREQUENCY (MHz)
INPUT IP3 (dBm)
900
L = L3 = L6
800
24
23
26
25
27
22
700 1000
L = 0 Ω, 7.5nH, 15nH
L = 30nH
2LO-2RF RESPONSE vs. RF FREQUENCY
(VARIOUS VALUES OF L3 AND L6)
MAX19985A toc49
RF FREQUENCY (MHz)
2LO-2RF RESPONSE (dBc)
900
P RF = -5dBm
L = L3 = L6
800
65
60
55
75
70
80
50
700 1000
L = 30nH
L = 7.5nH
L = 15nH
L = 0 Ω
3LO-3RF RESPONSE vs. RF FREQUENCY
(VARIOUS VALUES OF L3 AND L6)
MAX19985A toc50
RF FREQUENCY (MHz)
3LO-3RF RESPONSE (dBc)
900
P RF = -5dBm
L = L3 = L6
800
75
65
85
95
55
700 1000
L = 0 Ω, 7.5nH, 15nH, 30nH
LO LEAKAGE AT IF PORT vs. LO FREQUENCY
(VARIOUS VALUES OF L3 AND L6)
MAX19985A toc51
LO FREQUENCY (MHz)
LO LEAKAGE AT IF PORT (dBm)
1100 1000
-20
-30
-10
-50
-60
-40
0
-70
900 1200 1050 950 1150
L = 0 Ω
L = 7.5nH
L = 30nH
L = 15nH
L = L3 = L6
RF-TO-IF ISOLATION vs. RF FREQUENCY
(VARIOUS VALUES OF L3 AND L6)
MAX19985A toc52
RF FREQUENCY (MHz)
RF-TO-IF ISOLATION (dB)
900 800
40
20
10
30
50
0
700 1000
L = 0 Ω
L = 7.5nH
L = 30nH
L = 15nH
L = L3 = L6
Typical Operating Characteristics (continued)
( Typical Application Circuit, V CC = +5.0V, P LO = 0dBm, P RF = -5dBm, LO is high-side injected for a 200MHz IF, T C =+25°C, unless
otherwise noted.)