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AD8313 Datasheet(PDF) 14 Page - Analog Devices

Part # AD8313
Description  0.1 GHz to 2.5 GHz 70 dB Logarithmic Detector/Controller
PDF  24 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8313 Datasheet(HTML) 14 Page - Analog Devices

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AD8313
Rev. D | Page 14 of 24
SETPOINT INTERFACE, VSET
The setpoint interface is shown in Figure 28. The voltage, VSET, is
divided by a factor of 3 in a resistive attenuator of 18 kΩ total
resistance. The signal is converted to a current by the action of
the op amp and the resistor R3 (1.5 kΩ), which balances the
current generated by the summed output of the nine detector
cells at the input to the previous cell. The logarithmic slope is
nominally 3 µs × 4.0 µA/dB × 1.5 kΩ = 18 mV/dB.
8
VSET
VPOS
R1
12k
Ω
R2
6k
Ω
6
COMM
25
µA
25
µA
FDBK
TO O/P
STAGE
1
R3
1.5k
Ω
LP
Figure 28. Setpoint Interface Circuitry



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