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STPAC01F1 Datasheet(PDF) 3 Page - STMicroelectronics

No. de pieza STPAC01F1
Descripción Electrónicos  RF DETECTOR FOR POWER AMPLIFIER CONTROL
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPAC01F1 Datasheet(HTML) 3 Page - STMicroelectronics

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STPAC01F1
3/6
Coupler
GND2
Out
GND1
VDCOut
IDC = 50µA
IDC = 50µA
STPAC01F1
RF input
VBIAS
Vtemp
Thermal
compensation
Low pass
filter
RF detector
-
+
APPLICATION DIAGRAM
The STPAC01 is the first part of the power amplifier stage and provides both RF power and die
temperature measurements. The above figure gives the basic circuit of RF detector.
A coupler located on the line between RF amplifier output and the antenna takes a part of the available
power and applies it to STPAC01 RF input.
The RF detector and the low pass filter provide a DC voltage depending on the input power. Thermal
compensation provides a DC voltage depending on the ambient temperature. As the detection system and
the thermal compensation are based on the same topology, VDCout will have the same temperature
variation as Vtemp. Connected to a differential amplifier, the output will be a voltage directly linked to the
RF input power. VDCout and Vtemp must be bias with 50µA DC current.
This topology offers the most accurate output value as it is 100% compensated.
VDCOut
IDC
RF in
VBIAS
DC output
voltage
RF generator
Power
supply
Current
generator
STPAC
test board
Multimeter
Fig. 1: VDCout measurement circuit.
0.8
1
1.2
1.4
1.6
1.8
2
-20
-15
-10
-5
0
5
10
Pin (dBm)
VDCout
850MHz
1850MHz
Tamb = 25°C
Ibias = 50µA
Vbias = 2.7V
Fig. 2: VDCout versus RF input power.


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