LTC5585_15 Datasheet, PDF (11/38 Pages) Linear Technology – Wideband IQ Demodulator with IIP2 and DC Offset Control

LTC5585
TYPICAL PERFORMANCE CHARACTERISTICS 1950MHz application. V_CC = 5V, EN = 5V, EDC = 0V,
REF = 0.5V, EIP2 = 0V, T_C = 25°C, P_LO = 6dBm, f_LO = 1940MHz, f_RF1 = 1950MHz, f_RF2 = 1951MHz, 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.
DSB Noise Figure Distribution,
I Side
100
T_C = –40°C
90
T_C = 25°C
80
T_C = 85°C
T_C = 105°C
70
60
50
40
30
20
10
0
11 12 13 14 15 16 17
DSB NOISE FIGURE (dB)
5585 G39
DSB Noise Figure Distribution,
Q Side
100
T_C = –40°C
90
T_C = 25°C
80
T_C = 85°C
T_C = 105°C
70
60
50
40
30
20
10
0
11 12 13 14 15 16 17
DSB NOISE FIGURE (dB)
5585 G40
IIP2 Distribution, I Side
100
T_C = –40°C
90 T_C = 25°C
80
T_C = 85°C
T_C = 105°C
70
60
50
40
30
20
10
0
70 75 80 85 90
IIP2 (dBm)
95 100
5585 G41
IIP2 Distribution, Q Side
100
T_C = –40°C
90
T_C = 25°C
80
T_C = 85°C
T_C = 105°C
70
60
50
40
30
20
10
0
70 75 80 85 90 95 100
IIP2 (dBm)
5585 G42
Phase Error Distribution
30
T_C = –40°C
T_C = 25°C
T_C = 85°C
T_C = 105°C
20
Gain Error Distribution
70
60
50
T_C = –40°C
T_C = 25°C
T_C = 85°C
T_C = 105°C
40
30
20
10
0
–0.1
–0.06 –0.02 0.02 0.06 0.1
GAIN ERROR (dB)
5585 G43
Image Rejection Distribution
(Note 10)
50
T_C = –40°C
T_C = 25°C
40
T_C = 85°C
T_C = 105°C
30
20
10
10
0
–1
–0.8 –0.6 –0.4 –0.2 0
PHASE ERROR (DEGREES)
5585 G44
0
40 42.5 45 47.5 50 52.5 55 57.5 60
IMAGE REJECTION (dB)
5585 G45
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