DATA SHEET SKY65137-11: Power Amplifier for 802.11a WLAN Applications Applications Description • IEEE802.11a WLAN enabled: − access points − media gateways − set top boxes − LCD TVs Skyworks SKY65137-11 is a Microwave Monolithic Integrated Circuit (MMIC) Power Amplifier (PA) with superior output power, linearity, and efficiency. These features make the SKY65137-11 ideal for Wireless Local Area Network (WLAN) applications. • Other broadband triple-play multimedia applications Features • Linear output power of +24 dBm for IEEE802.11a 64-QAM EVM <2.5% • High gain of 26 dB • Output power detector: 20 dB dynamic range The device is fabricated using Skyworks high reliability Indium Gallium Phosphide (InGaP) Heterojunction Bipolar Transistor (HBT) technology. The device is internally matched and mounted in a 20-pin, 6 x 6 mm Multi-Chip Module (MCM) Surface-Mounted Technology (SMT) package, which allows for a highly manufacturable low cost solution. The device package and pinout for the 20-pin MCM are shown in Figure 1. A block diagram of the SKY65137-11 is shown in Figure 2. • Power shutdown mode • Superior gain flatness • Internal RF match and bias circuits • Small footprint, MCM (20-pin, 6 x 6 mm) SMT package (MSL3, 260 °C per JEDEC J-STD-020) Figure 1. SKY65137-11 Pinout – 20-Pin MCM (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200851J • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 25, 2011 1 DATA SHEET • SKY65137-11 WLAN PA Figure 2. SKY65137-11 Block Diagram Table 1. SKY65137-11 Signal Descriptions Pin # Name Description Pin # Name Description 1 GND Ground 11 VCC3 Stage 3 collector voltage 2 GND Ground 12 N/C No connection 3 PA_EN Power shutdown enable 13 VCC2 Stage 2 collector voltage 4 VC_BIAS Bias voltage 14 V_DET Detector output signal 5 N/C No connection 15 N/C No connection 6 N/C No connection 16 VCC1 Stage 1 collector voltage 7 N/C No connection 17 GND Ground 8 GND Ground 18 RF_IN RF input 9 RF_OUT RF output 19 GND Ground 10 GND Ground 20 GND Ground Technical Description The SKY65137-11 PA contains all of the needed RF matching and DC biasing circuits. The device also provides an output power detector voltage. The SKY65137-11 is a three-stage, HBT InGaP device optimized for high linearity and power efficiency. These features make the device suitable for wideband digital applications, where PA linearity and power consumption are of critical importance (e.g., WLANs). The device has been characterized with the highest specified data rates for IEEE802.11a (54 Mbps). Under these stringent test conditions, the device exhibits excellent spectral purity and power efficiency. Electrical and Mechanical Specifications Signal pin assignments and functional pin descriptions are described in Table 1. The absolute maximum ratings of the SKY65137-11 are provided in Table 2. Electrical specifications are provided in Table 3. Typical performance characteristics of the SKY65137-11 are illustrated in Figures 3 through 19. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 March 25, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200851J DATA SHEET • SKY65137-11 WLAN PA Table 2. SKY65137-11 Absolute Maximum Ratings (Note 1) Parameter Symbol Minimum Maximum Units RF output power (CW signal) POUT +28 dBm Supply voltage, measured at pin of package (Note 2) VCC1, VCC2, VCC3, VC_BIAS 5.5 V PA_EN 3.8 V Total supply current (ICC + IBIAS + IREF) ICC_TOTAL 1200 mA Storage temperature TST +125 °C Junction temperature TJ Thermal resistance ΘJC –55 23 +150 °C 28 °C/W Note 1: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other parameters set at or below their nominal value. Exceeding any of the limits listed here may result in permanent damage to the device. Note 2: Evaluation Board supply voltage levels can be different. Refer to the Evaluation Board schematic diagram in Figure 21. CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times. Table 3. SKY65137-11 Recommended Operating Conditions Parameter Symbol Minimum Typical Frequency range f RF output power POUT Supply voltage, measured at pin of package (Note 1) VCC1, VCC2, VCC3, VC_BIAS 4.5 5.0 2.5 3.0 TC –40 Units 5.9 GHz +24 Power shutdown enable voltage @ PA_EN Case operating temperature Maximum 4.9 dBm 5.5 V 3.6 V +85 °C Note 1: Evaluation Board supply voltage levels can be different. Refer to the Evaluation Board schematic diagram in Figure 21. Table 4. SKY65137-11 Electrical Specifications (1 of 2) (Note 1) (VCC1 = VCC2 = VCC3 = VC_BIAS = 5 V, PA_EN = 3.3 V Static, TC = +25 °C, Test Frequency = 5.75 GHz unless otherwise noted) Parameter Symbol Test Condition Min Typical 24.5 26 Max Units Using Continuous Wave Input Signals Small signal gain |S21| Gain flatness over band PIN = –30 dBm From 5.6 to 5.9 GHz Output power @ 1 dB compression P1dB Quiescent Current IQ No RF input Input return loss |S11| PIN = –30 dBm Detector voltage VDET POUT = +24 dBm POUT = 0 dBm Power added efficiency @ P1dB PAE @ P1dB Shutdown mode current draw 1 +31 +32 420 0.50 0.10 26 dB 2 0.60 0.15 dBm 485 mA –10 dB 0.70 0.20 V V 2.5 μA 29 2.0 dB % Power-up time TUP 500 ns Power-down time TDOWN 50 ns Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200851J • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 25, 2011 3 DATA SHEET • SKY65137-11 WLAN PA Table 4. SKY65137-11 Electrical Specifications (1 of 2) (Note 1) (VCC1 = VCC2 = VCC3 = VC_BIAS = 5 V, PA_EN = 3.3 V Static, TC = +25 °C, Test Frequency = 5.75 GHz, Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units 490 570 mA +2.0 +2.5 dBm Using IEEE802.11a Orthogonal Frequency Division Multiplexing Input Signal, Data Rate = 54 Mbps Total supply current ICC_TOTAL EVM @ POUT = +24 dBm POUT_EVM POUT = +24 dBm Static ruggedness PA_EN static, 10:1 VSWR, PIN = +10 dBm, 64 QAM input signal Pass, all phases – Dynamic ruggedness PA_EN pulsed, 4:1 VSWR, PIN = +1 dBm, 64 QAM input signal Pass, all phases – Note 1: Performance is guaranteed only under the conditions listed in this Table. Typical Performance Characteristics (VCC1 = VCC2 = VCC3 = VC_BIAS = 5 V, PA_EN = 3.3 V Static, TC = +25 °C, Test Frequency = 5.75 GHz, Unless Otherwise Noted) Figure 3. Low Band EVM vs Output Power Figure 4. High Band EVM vs Output Power Figure 5. Low Band Detector Voltage vs Output Power Figure 6. High Band Detector Voltage vs Output Power Figure 7. Supply Current vs Output Power, Modulated Input Figure 8. Supply Current vs Output Power, CW Input Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 March 25, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200851J DATA SHEET • SKY65137-11 WLAN PA Figure 9. EVM vs Output Power Over Voltage Figure 10. EVM vs Output Power Over Temperature Figure 11. Small Signal Gain vs Frequency Over Voltage Figure 12. Small Signal Gain vs Frequency Over Temperature Figure 13. Typical Spectral Response With 802.11a 65-QAM OFDM Signal Over Output Power Level Figure 14. Second Harmonic vs Output Power Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200851J • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 25, 2011 5 DATA SHEET • SKY65137-11 WLAN PA Figure 15. Detector Voltage vs Output Power Over Temperature Figure 16. Detector Voltage vs Output Power Over Voltage Figure 17. Noise Figure vs Frequency Figure 18. Start-Up Time Figure 19. Power-Down Time Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 March 25, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200851J DATA SHEET • SKY65137-11 WLAN PA Evaluation Board Description The SKY65137-11 Evaluation Board is used to test the performance of the SKY65137-11 WLAN PA. An assembly drawing for the Evaluation Board is shown in Figure 20 and the layer detail is provided in Figure 21. Layer detail physical characteristics are noted in Figure 22. A schematic diagram of the SKY65137-11 Evaluation Board is shown in Figure 23. Step 3: Connect a signal generator to the RF signal input port. Set it to the desired RF frequency at a power level of –15 dBm or less to the Evaluation Board. DO NOT enable the RF signal. Step 4: Connect a spectrum analyzer or vector signal analyzer to the RF signal output port. Add attenuation as needed to protect the analyzer. The following design considerations are general in nature and must be followed regardless of final use or configuration Step 5: On startup, turn on the VCC1, VCC2, VCC3, and VC_BIAS lines first. Then turn on the PA_ENB line. Finally, turn on the RF input. Make sure to keep the initial input power to the PA at –20 dBm and gradually increase to the desired output power level. 1. Paths to ground should be made as short as possible. Step 6: Take measurements. 2. The ground pad of the SKY65137-11 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 device. Therefore, design the connection to the ground pad to dissipate the maximum wattage produced by the circuit board. Multiple vias to the grounding layer are required. Step 7: On power down, turn off the RF input first. Then turn off the PA_ENB line. Finally, turn off the VCC1, VCC2, VCC3, and VC_BIAS lines. Circuit Design Considerations 3. Bypass capacitors should be used on the DC supply lines. The VCC lines may be connected after the RF bypass and decoupling capacitors to provide better isolation between each VCC line. Refer to Figure 23 for further details. 4. The RF lines should be well separated from each other with solid ground in between traces to maximize input-to-output isolation. NOTE: A poor connection between the slug and ground increases junction temperature (TJ), which reduces the lifetime of the device. Refer to the Skyworks Application Note, “PCB Design Guidelines for High Power Dissipation Packages” (document number 201211) for further information. Evaluation Board Test Procedure Step 1: Connect a +5 V supply to the VCC1, VCC2, VCC3, and VC_BIAS pins. Connect the PA_ENB pin to a separate supply. If available, enable the current limiting function of the power supply to 1000 mA. Step 2: If desired, connect a voltage meter to the V_DET pin. Package Dimensions The PCB layout footprint for the SKY65137-11 is provided in Figure 22. Package dimensions for the 20-pin MCM are shown in Figure 23, and tape and reel dimensions are provided in Figure 24. Package and Handling Information Since the device package is sensitive to moisture absorption, it is baked and vacuum packed before shipping. Instructions on the shipping container label regarding exposure to moisture after the container seal is broken must be followed. Otherwise, problems related to moisture absorption may occur when the part is subjected to high temperature during solder assembly. The SKY65137-11 is rated to Moisture Sensitivity Level 3 (MSL3) at 260 °C. It can be used for lead or lead-free soldering. For additional information, refer to Skyworks Application Note, PCB Design and SMT Assembly/Rework Guidelines for MCM-L Packages, document number 101752. Care must be taken when attaching this product, whether it is done manually or in a production solder reflow environment. Production quantities of this product are shipped in a standard tape and reel format. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200851J • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 25, 2011 7 DATA SHEET • SKY65137-11 WLAN PA Figure 20. Evaluation Board Assembly Drawing Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 March 25, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200851J DATA SHEET • SKY65137-11 WLAN PA Figure 21. SKY65137-11 Evaluation Board Layer Detail Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200851J • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 25, 2011 9 DATA SHEET • SKY65137-11 WLAN PA Figure 22. Evaluation Board Layer Detail Physical Characteristics Figure 23. SKY65137-11 Evaluation Board Schematic Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 10 March 25, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200851J DATA SHEET • SKY65137-11 WLAN PA Figure 24. PCB Layout Footprint For The SKY65137-11 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200851J • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 25, 2011 11 DATA SHEET • SKY65137-11 WLAN PA Figure 25. SKY65137-11 20-Pin MCM Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 12 March 25, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200851J DATA SHEET • SKY65137-11 WLAN PA Figure 26. SKY65137-11 20-Pin MCM Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200851J • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 25, 2011 13 DATA SHEET • SKY65137-11 WLAN PA Ordering Information Model Name SKY65137-11 WLAN Power Amplifier Manufacturing Part Number SKY65137-11 Evaluation Board Part Number TW17-D335-007 Copyright © 2008, 2009, 2010, 2011 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 14 March 25, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200851J