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LTC5586 Datasheet(PDF) 21 Page - Linear Technology

Part # LTC5586
Description  6GHz High Linearity I/Q Demodulator with Wideband IF Amplifier
PDF  34 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC5586 Datasheet(HTML) 21 Page - Linear Technology

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LTC5586
21
5586fa
For more information www.linear.com/LTC5586
applicaTions inForMaTion
single-ended LO input, it is necessary to terminate the
unused LO input (LOP in Figure 7) into 50Ω.
The programmable input match adjust is controlled by
the BAND, CF1, LF1, and CF2 registers as detailed in the
register map shown in Table 3. The return loss for the
register setting in Table 3 is shown in Figure 8.
Table 3. Register Settings for Single-Ended LO Matching
LO FREQUENCY (MHz)
BAND
CF1
LF1
CF2
300 - 339
0
31
3
31
339 - 398
0
21
3
24
398 - 419
0
14
3
23
419 - 556
0
17
2
31
556 - 625
0
10
2
23
625 - 801
0
15
1
31
801 - 831
0
14
1
27
831 - 1046
0
8
1
21
1046 - 1242
1
31
3
31
1242 - 1411
1
21
3
28
1411 - 1696
1
17
2
26
1696 - 2070
1
15
1
31
Default
1
8
3
3
2070 - 2470
1
8
1
21
2470 - 2980
1
2
1
10
2980 - 3500
1
1
0
19
3500 - 6000
1
0
0
0
Figure 8. Single-Ended LO Input Return Loss vs
BAND, CF1, LF1, and CF2
0
1
2
3
4
5
6
7
8
5
0
–5
–10
–15
–20
–25
–30
–35
LO FREQUENCY (GHz)
0, 31, 3, 31
0, 17, 2, 31
0, 14, 1, 27
1, 21, 3, 28
1, 15, 1, 31
1, 2, 1, 10
1, 1, 0, 19
1, 0, 0, 0
TC = 25°C
5586 F08
LTC5586
5586 F09
C5
0.3pF
C6
1000pF
C7
0.3pF
C8
1000pF
LO
MATCH
ADJUST
0º
90º
GND
LOM
LO
INPUT
(MATCHED)
LOP
ANAREN
B4859A53
VCC
Figure 9. Simplified Schematic of the LO Inputs
Using a Balun for Differential Drive
Figure 10. OIP2 vs Single-Ended and Differential LO Input
0
1
2
3
4
5
6
100
90
80
70
60
50
40
30
20
10
0
RF FREQUENCY (GHz)
I, SINGLE-ENDED
Q, SINGLE-ENDED
I, DIFFERENTIAL
Q, DIFFERENTIAL
5586 F10
TC = 25°C
The LO inputs can also be driven differentially. Figure 10
compares the uncalibrated OIP2 performance of single
ended versus differential LO drive using the ANAREN
B4859A53 balun as shown in the schematic of Figure 9.



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