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AD8361-EVAL Fiches technique(PDF) 19 Page - Analog Devices

No de pièce AD8361-EVAL
Description  LF to 2.5 GHz TruPwr??Detector
Download  24 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD8361-EVAL Fiches technique(HTML) 19 Page - Analog Devices

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AD8361
Rev. C | Page 19 of 24
One of the AD8361s (U2) has a net gain of about 14 dB
preceding it and therefore operates most accurately at low input
signal levels. This is referred to as the weak signal path. U4, on
the other hand, does not have the added gain and provides
accurate response at high levels. The output of U2 is attenuated
by R1 in order to cancel the effect of U2’s preceding gain so that
the slope of the transfer function (as seen at the slider of R1) is
the same as that of U4 by itself.
2.5 GHz. However, it is necessary to calibrate for a given
application to accommodate for the change in conversion gain
at higher frequencies.
Dynamic Range Extension for the AD8361
The accurate measurement range of the AD8361 is limited by
internal dc offsets for small input signals and by square law
conformance errors for large signals. The measurement range
may be extended by using two devices operating at different
signal levels and then choosing only the output of the device
that provides accurate results at the prevailing input level.
The circuit comprising U3, U5, and U6 is a crossfader, in which
the relative gains of the two inputs are determined by the output
currents of a fuzzy comparator made from Q1 and Q2.
Assuming that the slider of R2 is at 2.5 V dc, the fuzzy
comparator commands full weighting of the weak signal path
when the output of U2 is below about 2.0 V dc, and full
weighting of the strong signal path when the output of U3
exceeds about 3.0 V dc. U3 and U5 are OTAs (operational
transconductance amplifiers).
Figure 60 depicts an implementation of this idea. In this circuit,
the selection of the output is made gradually over an input level
range of about 3 dB in order to minimize the impact of
imperfect matching of the transfer functions of the two
AD8361s. Such a mismatch typically arises because of the
variation of the gain of the RF preamplifier U1 and both the
gain and slope variations of the AD8361s with temperature.
8
7
6
5
1
2
3
4
AD8361
0.1
µF
5V
100pF
5V
0.01
µF
68
U2
ERA-3
20dB
U1
RFC
270
12V
6dB
PAD
6dB
SPLITTER
RF
INPUT
12V
20k
1k
1k
5V
R2
10k
Q2
2N3906
Q1
2N3906
16k
R1
5k
CA3080
+12V
–5V
U3
20k
CA3080
+12V
–5V
U5
2
3
5
6
2
3
5
6
20k
1M
R3
10k
–5V
+5V
12k
8
7
6
5
1
2
3
4
AD8361
0.1
µF
5V
100pF
5V
0.01
µF
68
U4
AD820
5V
U6
2
3
8.2nF
4
7
6
VOUT
100
Figure 60. Range Extender Application


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