ADL5391-EVALZ AD [Analog Devices], ADL5391-EVALZ Datasheet - Page 12

• Manufacturer Part Number: ADL5391-EVALZ
• Description: DC to 2.0 GHz Multiplier
• Manufacturer: AD [Analog Devices]

ADL5391
Use as a Detector
The ADL5391 can be used as a square law detector. When
amplitude squaring is performed, there are components of the
multiplier output that correlate to the signal bleedthrough and
second harmonic, as seen in Equation 4. However, as noted in
the Squaring and Frequency Doubling section, there is also a dc
component that is directly related to the offset and the squared
input magnitude. If a signal is split and feed into the X and Y
inputs and a low-pass filter were place on the output, the resulting
dc signal would be directly related to the square of the input
magnitude. The intercept of the response will shift slightly from
part to part (and over temperature) with the offset, but this can
Figure 18. Single-Ended (DC) ADL5391 Used as a Harmonic Generator
XIN
–10
–15
–20
–25
–30
–35
–40
–45
–50
–55
–60
–65
–5
0
74Ω
10
5dB PAD
100
21Ω
53Ω
Figure 19. Setup for Single-Ended Data
SECOND HARMONIC GAIN
200
53Ω
YP
XP
J6
J8
YIN
74Ω
0.1µF
0.1µF
300
C18
C20
0.1µF
0.1µF
21Ω
C7
C4
FREQUENCY (MHz)
5dB PAD
400
T3
T2
THIRD HARMONIC GAIN
XM
XP
YM
YP
BLEEDTHRU GAIN
500
TC1-1-13M
TC1-1-13M
600
WM
WP
700
Figure 22. Schematic for ADL5391 Used as Square Law Detector
150Ω
56.2Ω
56.2Ω
200Ω
R2
R1
800
10dB PAD
62Ω
900 1000
11
12
13
14
XM
XP
YM
YP
WM
WP
Rev. 0 | Page 12 of 16
6
5
R4
100Ω
24.9Ω
24.9Ω
R6
R5
be removed through calibration. Figure 20 shows the response
of the ADL5391 as a square law detector, Figure 21 shows the
error vs. the input power, and Figure 22 shows the
configuration used.
Figure 20. ADL5391 Used as Square Law Detector DC Output vs. Square of Input
Figure 21. ADL5391Used as a Square Law Detector Error vs. Power Input
R12
OPEN
–0.2
0.7
0.6
0.5
0.4
0.3
0.2
0.1
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
–30
0
40µH
40µH
T1
–25
0.1
45nF
–20
0.2
74µH
74µH
–15
0.3
40nF
PIN X (dBm)
V
IN
(V rms)
–10
0.4
J1
WP
2
0.5
–5
J2
WM
0.6
0
0.7
5
0
10
.8