5
LT5521
5521f
LO-RF Leakage vs LO Frequency
Conversion Gain, IIP3 and Noise
Figure vs Supply Voltage
Conversion Gain and IIP3
vs LO Power
LO-RF Leakage vs LO Power
LO-RF Leakage vs Supply Voltage Noise Figure vs LO Power
WU
TYPICAL AC PERFOR A CE CHARACTERISTICS
f
LO
= 1700MHz, f
IF
= 250MHz, f
RF
= 1950MHz,
P
LO
= –5dBm, V
CC
= 5V, EN = 2.9V, T
A
= 25°C, unless otherwise noted. Test circuit shown in Figure 1 is tuned for 1.95GHz output
frequency and V
CC
= 5V.
LO FREQUENCY (MHz)
1500
–48
LEAKAGE (dBm)
–46
–44
–42
–40
1600 1700
85°C
1800
1900
5521 G06
–38
–36
1550 1650
1750
1850
–40°C
25°C
V
CC
(V)
4.6
–2
G
C
(dB)
IIP3 (dBm) AND NOISE FIGURE (dB)
0
2
4
6
4.8 5.0
5.2
5.4
5521 G07
8
10
0
5
10
15
20
25
IIP3
30
4.7 4.9
5.1
5.3
85°C
25°C
–40°C
NF
G
C
LO POWER (dBm)
–25
4
6
10
–10 0
5521 G08
2
0
–20 –15
–5
G
C
IIP3
510
–2
–4
8
22
23
25
21
20
19
18
24
G
C
(dB)
IIP3 (dBm)
85°C
25°C
–40°C
LO POWER (dBm)
–25
–50
LO LEAKAGE (dBm)
–48
–44
–42
–40
–5
–32
5521 G09
–46
–15
–20
05
–10 10
–38
–36
–34
85°C
25°C
–40°C
V
CC
(V)
4.7
LO LEAKAGE (dBm)
–44
–42
–40°C
–40
5.0
5.2
5521 G10
–46
–48
–50
4.8 4.9 5.1
–38
–36
–34
5.3
85°C
25°C
LO POWER (dBm)
–20
NOISE FIGURE (dB)
16
18
20
0
5521 G11
14
12
15
17
19
13
11
10
–15
–10
–5
5
85°C
–40°C
25°C
Low Side LO (LS) and High Side
LO (HS) Comparison: Conversion
Gain and IIP3 vs RF Frequency
RF
OUT
(MHz)
1750
4
6
10
2050
5521 G13
2
0
1850 1950 2150
–2
–4
8
LS
20
22
HS
HS
26
18
16
14
12
24
G
C
(dB)
IIP3 (dBm)
LSG
C
IIP3
LS: R1 = R7 = 110Ω
HS: R1 = R7 = 121Ω
f
IF
= 250MHz
Low Side LO (LS) and High Side
LO (HS) Comparison: Noise Figure
vs RF Frequency
RF
OUT
(MHz)
1700
11.5
NOISE FIGURE (dB)
11.7
12.1
12.3
12.5
LS
13.5
12.9
1800
1900
1950
5521 G14
11.9
13.1
13.3
12.7
1750 1850
2000
2050
2100
HS
LS: R1 = R7 = 110Ω
HS: R1 = R7 = 121Ω
f
IF
= 250MHz
