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CX65100 Scheda tecnica(PDF) 6 Page - Skyworks Solutions Inc.

Il numero della parte CX65100
Spiegazioni elettronici  700 - 1000 MHz Linear Power Amplifier
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Produttore elettronici  SKYWORKS [Skyworks Solutions Inc.]
Homepage  http://www.skyworksinc.com
Logo SKYWORKS - Skyworks Solutions Inc.

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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
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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