LTC5585_15 Datasheet, PDF (13/38 Pages) Linear Technology – Wideband IQ Demodulator with IIP2 and DC Offset Control

LTC5585
TYPICAL PERFORMANCE CHARACTERISTICS 2150MHz application. V_CC = 5V, EN = 5V,
EDC = 0V, EIP2 = 0V, REF = 0.5V, T_C = 25°C, P_LO = 6dBm, f_LO = 2140MHz, f_RF1 = 2150MHz, f_RF2 = 2151MHz, f_BB = 10MHz,
P_RF1 = P_RF2 = –5dBm, DC Blocks and Mini-Circuits PSCJ-2-1 180° combiner at baseband outputs de-embedded from measurement
unless otherwise noted. Test circuit with RF and LO ports impedance matched as in Figure 1.
Noise Figure vs RF Input Power
25
24
23
PLO = 0dBm
PLO = 6dBm
PLO = 10dBm
22
21
T_C = 25°C
f_LO = 2140MHz
20 _{fRF = 2141MHz}
19 f_NOISE = 60MHz
18
17
16
15
14
13
12
11
10
–20 –15 –10 –5 0
5 10
RF INPUT POWER (dBm)
Noise Figure and Conversion
Gain vs Temperature (T_C)
24
22
I, –40°C
I, 25°C
Q, –40°C
Q, 25°C
20
I, 85°C
Q, 85°C
18
I, 105°C
Q, 105°C
16
NF
14
12
10
8
6
4
GAIN
2
0
–2
–4
1750 1850 1950 2050 2150 2250 2350 2450 2550
LO FREQUENCY (MHz)
Noise Figure and Conversion
Gain vs LO Power
24
22
I, 0dBm
I, 6dBm
Q, 0dBm
Q, 6dBm
T_C = 25°C
20
I, 10dBm Q, 10dBm
18
16
14
NF
12
10
8
6
4
GAIN
2
0
–2
–4
1750 1850 1950 2050 2150 2250 2350 2450 2550
LO FREQUENCY (MHz)
5585 G55
DC Offset vs DCOI, DCOQ Control
Voltage
5585 G56
DC Offset vs LO Power
5585 G57
40
35 ^{fLO = 2150MHz}
30
25
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
20
15
10
5
0
–5
–10
–15
–20
–25
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
DCOI, DCOQ (V)
15
I, 0dBm
Q, 0dBm
13 I, 6dBm
Q, 6dBm
I, 10dBm Q, 10dBm
11
T_C = 25°C
9
7
5
3
1
–1
–3
–5
1750 1850 1950 2050 2150 2250 2350 2450 2550
LO FREQUENCY (MHz)
5585 G58
5585 G59
LO to RF Leakage and RF to LO
Isolation
–20
–25
L-R, –40°C
L-R, 25°C
R-L, –40°C
R-L, 25°C
–30
L-R, 85°C
R-L, 85°C
–35
L-R, 105°C R-L, 105°C
–40
–45
–50
–55
–60
–65
–70
–75
–80
–85
–90
1750 1850 1950 2050 2150 2250 2350 2450 2550
LO FREQUENCY (MHz)
5585 G60
Image Rejection vs Temperature
(Note 10)
100
T_C = –40°C
90
T_C = 25°C
T_C = 85°C
80
T_C = 105°C
70
60
50
40
30
20
1750 1850 1950 2050 2150 2250 2350 2450 2550
LO FREQUENCY (MHz)
5585 G61
5585fb
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