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AP513-PCB Datasheet(PDF) 4 Page - WJ Communication. Inc. |
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AP513-PCB Datasheet(HTML) 4 Page - WJ Communication. Inc. |
4 / 5 page Specifications and information are subject to change without notice WJ Communications, Inc • Phone 1-800-WJ1-4401 • FAX: 408-577-6621 • e-mail: sales@wj.com • Web site: www.wj.com Page 4 of 5 June 2006 AP513 DCS-band 8W HBT Amplifier Module Product Information The Communications Edge TM MTTF Calculation The MTTF of the AP513 can be calculated by first determining how much power is being dissipated by the amplifier module. Because the device’s intended application is to be a power amplifier pre-driver or final stage output amplifier, the output RF power of the amplifier will help lower the overall power dissipation. In addition, the amplifier can be biased with different quiescent currents, so the calculation of the MTTF is custom to each application. The power dissipation of the device can be calculated with the following equation: Pdiss = Vcc * Icc – (Output RF Power – Input RF Power), Vcc = Operating supply voltage = 12V Icc = Operating current {The RF power is converted to Watts} While the maximum recommended case temperature on the datasheet is listed at 85 ˚C, it is suggested that customers maintain an MTTF above 1 million hours. This would convert to a derating curve for maximum case temperature vs. power dissipation as shown in the plot below. Maximum Recommended Case Temperature vs. Power Dissipation to maintain 1 million hours MTTF 50 60 70 80 90 8 101214 16 18 202224 Power Dissipation (Watts) To calculate the MTTF for the module, the junction temperature needs to be determined. This can be easily calculated with the module’s power dissipation, the thermal resistance value, and the case temperature of operation: Tj = Pdiss * Rth + Tcase Tj = Junction temperature Pdiss = Power dissipation (calculated from above) Rth = Thermal resistance = 4.5 ˚C/W Tcase = Case temperature of module’s heat sink From a numerical standpoint, the MTTF can be calculated using the Arrhenius equation: MTTF = A* e (Ea/k/Tj) A = Pre-exponential Factor = 6.087 x 10 -11 hours Ea = Activation Energy = 1.39 eV k = Boltzmann’s Constant = 8.617 x 10 -5 eV/ ºK Tj = Junction Temperature (ºK) = Tj (ºC) + 273 A graphical view of the MTTF can be shown in the plot below. MTTF vs. Junction Temperature 1.E+05 1.E+06 1.E+07 130 140 150 160 170 180 Junction Temperature (°C) |
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