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R_10032 датащи(PDF) 4 Page - NXP Semiconductors |
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R_10032 датащи(HTML) 4 Page - NXP Semiconductors |
4 / 10 page R_10032 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Report Rev. 1.0 — 24 July 2012 4 of 10 NXP Semiconductors R_10032 CA-330-11; LDMOS bias module The temperature sensing device (Qtemp), is attached to the baseplate near the RF device through a hole in the PCB. Its collector current is proportional to temperature, which results in a collector voltage slope of approximately 10 mV/C. Part of this temperature-dependent voltage is summed with the adjustable bias voltage from potentiometer R5 to generate the temperature-compensated final bias voltage. 3.2 Gate voltage adjustment A variable voltage derived from the 8 V supply is summed with the temperature monitor voltage to generate a temperature-compensated gate voltage. R7 and R9 are selected to set the desired gate voltage trim range, and R10 is selected to provide the desired amount of temperature compensation. Figure 1 shows component values for VGS = 2.2 0.7 V, as given in Figure 2. Fig 1. Gate voltage adjustment circuit aaa-004138 VGATE C1 1 μF C2 100 nF C7 100 nF R10 10 kΩ R12 5.11 kΩ R13 1.1 kΩ R8 R5 200 Ω R4 432 Ω R7 432 Ω +8 V R9 75 Ω 2 kΩ 3 1 3 2 1 2 R11 909 Ω Qtemp BC847 5 2 1 3 U2 LM7321MF 4 C6 1 μF |
Аналогичный номер детали - R_10032 |
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Аналогичное описание - R_10032 |
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