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CX65100 Scheda tecnica(PDF) 6 Page - Skyworks Solutions Inc. |
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CX65100 Scheda tecnica(HTML) 6 Page - Skyworks Solutions Inc. |
6 / 9 page DATA SHEET • CX65100 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 6 August 13, 2004 • Skyworks Proprietary and Confidential information • Products and product information are subject to change without notice • 101471F Evaluation Board Description Skyworks CX65100 Evaluation Board is used to test the performance of the CX65100 PA. The Evaluation Board schematic diagram is shown in Figure 11. The schematic shows the basic design of the board for the 700 to 1000 MHz range. Figure 12 provides the Evaluation Board assembly diagram. Figure 13 provides the Evaluation Board layer detail. Circuit Design Considerations The following design considerations are general in nature and must be followed regardless of final use or configuration 1. Paths to ground should be made as short as possible. 2. The ground pad of the CX65100 PA has special electrical and thermal grounding requirements. This pad is the main thermal conduit for heat dissipation. Since the circuit board acts as the heat sink, it must shunt as much heat as possible from the amplifier. As such, design the connection to the ground pad to dissipate the maximum wattage produced to the circuit board. Multiple vias to the grounding layer are required. 3. Three external output bypass capacitors (150 pF, 0.01 µF, and 4.7 µF) are required on the VCC1 (pin 8) supply input. The same three capacitors are also required on the VCC2 (pin 4) supply input. All three capacitors should be placed in parallel between the supply line and ground. Also, 0.01 µF and 4.7 µF bypass capacitors are required on the VREF input (pin 3). See Figure 11 for a detailed diagram. 4. VCC1 (pin 8) and VCC2 (pin 4) may be connected together at the supply. 5. At the RF input (pin 2), a DC blocking capacitor is required. 6. The RF output includes an onboard internal DC blocking capacitor. All impedance matching is provided internally. Therefore, the application only needs to provide a good 50 Ω load. Testing Procedure Use the following procedure to set up the CX65100 Evaluation Board for testing. Refer to Figure 14 for guidance: 1. Connect a +3.4 V supply voltage to VCC1 and VCC2, and +3.2 V supply voltage to VREF. If available, enable the current limiting function of the power supplies to 1.0 A for the +3.4 V supply current and 30 mA for the +3.2 V supply current. 2. Connect a signal generator to the RF signal input port. Set it to the desired RF frequency at a power level of 2 dBm or less to the Evaluation Board but do NOT enable the RF signal. 3. Connect a spectrum analyzer to the RF signal output port. 4. Enable the power supply. 5. Enable the RF signal. 6. Take measurements. Caution: If the input signal exceeds the rated power, the CX65100 Evaluation Board can be permanently damaged. |
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