AN RFMD APPLICATION NOTE RFPA1 Application Note Product Description The RFPA1 is a.w QFN package power amplifier specifically designed for Wireless Infrastructure applications. The RFPA1 is a single-stage GaAs HBT power amplifier offering ultra-linear operation at a comparably low DC power making it ideal for next generation radios requiring high efficiency. This amplifier is ideal for GaAs Pre-Driver for Base Station Amplifiers, PA Stage for Commercial Wireless Infrastructure, nd or rd Stage LNAs, and Class AB Operation for GSM, DCS, PCS, UMTS, WiMAX, TD-SCDMA, and LTE Transceiver Applications. The RFPA1 offers a low noise figure making it an excellent solution for nd and rd stage LNAs. The RFPA1 is capable of operating in other bands such as 4MHz to 47MHz and 67MHz to 7MHz. Its external matching allows for use across various radio platforms within 4MHz to 7MHz. The following performance data of other band application is collected at normal operation condition (room temperature and V BIAS and V REF at V). RF MICRO DEVICES, RFMD, Optimum Technology Matching, Enabling Wireless Connectivity, PowerStar, POLARIS TOTAL RADIO and UltimateBlue are trademarks of RFMD, LLC. BLUETOOTH is a trademark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners., RF Micro Devices, Inc. 76 Thorndike Road, Greensboro, 749-94 For sales or technical 1 of 7
RFPA1 Typical Performance - 4MHz to 47MHz Application Circuit VREG VCC? uf? 1k?.1uF pf 1 1 pf pf 7pF 1 VREF VBIAS 11 4 9 nh Coilcraft pf nh pf RFOUT nh? 6 7 8 pf Figure 1. Schematic Figure. 4MHz to 47MHz Application Circuit 76 Thorndike Road, Greensboro, 749-94 For sales or technical of 7
S-Parameters: 4MHz to 47MHz Input Return Loss versus Frequency Output Return Loss versus Frequency - Input Return Loss (db) - - -1 - - Output Return Loss (db) -4-6 -8 - - - - -4 - Isolation versus Frequency - - - - Isolation (db) - - - -4-6 -8-4 76 Thorndike Road, Greensboro, 749-94 For sales or technical of 7
Data: 4MHz to 47MHz Output IP versus Frequency 47 46 4 44 4 4 41 4 1 9 8 1 7 Output P1dB versus Frequency 6 Noise Figure versus Frequency. Output P1dB (dbm) 1 9 7 Noise Figure (db) 4. 4.. Gain versus P OUT Output IP versus P OUT 47 4 7 1 1 4 MHz 4 MHz 47 MHz 4 MHz 4 MHz 47 MHz 1 P OUT (dbm) 7 1 P OUT (dbm) 76 Thorndike Road, Greensboro, 749-94 For sales or technical 4 of 7
RFPA1 Typical Performance - 67MHz to 7MHz Application Circuit VREG VCC? uf? 1K?.1uF pf 1 1 pf 1nH 8.pF 1 VREF VBIAS 11 4 9 nh Coilcraft.6pF pf RFOUT 1nH 1? 6 7 8 47nH Figure. Schematic Figure 4. 67MHz to 7MHz Application Circuit 76 Thorndike Road, Greensboro, 749-94 For sales or technical of 7
S-Parameters: 67MHz to 7MHz Input Return Loss versus Frequency Output Return Loss versus Frequency - -4 Input Return Loss (db) - - -1 - - Output Return Loss (db) -6-8 - - - - - - - -4 - Isolation versus Frequency - - - - Isolation (db) - - - -4-6 -8-4 76 Thorndike Road, Greensboro, 749-94 For sales or technical 6 of 7
Data: 67MHz to 7MHz Output IP versus Frequency 48 47 46 4 44 4 4 41 4 9 1 8 Output P1dB versus Frequency 8 Noise Figure versus Frequency 7 Output P1dB (dbm) 1 9 7 Noise Figure (db) 6 4 1 Gain versus P OUT Output IP versus P OUT 1.6 46.6 41.6 6.6 67 MHz 7 MHz 7 MHz 1.6 67 MHz 7 MHz 7 MHz 1 1 P OUT (dbm).6 1 Pout (dbm) T 76 Thorndike Road, Greensboro, 749-94 For sales or technical 7 of 7