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STPAC01F2 Datasheet(PDF) 3 Page - STMicroelectronics |
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STPAC01F2 Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 7 page STPAC01F2 3/7 Figure 3: Application diagram The STPAC01 is the first part of the power amplifier stage and provides both RF power and die tempera- ture 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 com- pensation 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. Coupler GND2 Out GND1 VDCOut IDC = 50µA IDC = 50µA STPAC01F2 RF input VBIAS Vtemp Thermal compensation Low pass filter RF detector - + Figure 4: VDCout measurement circuit Figure 5: VDCout versus RF input power VDCOut IDC RF in VBIAS DC output voltage RF generator Power supply Current generator STPAC test board Multimeter 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 |
Similar Part No. - STPAC01F2 |
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Similar Description - STPAC01F2 |
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