P R O D U C T B R I E F Dual-Band Power Amplifier for WLAN Systems The Infineon dual-band Power Amplifier PMB 8825 is an extremely linear, high power SiGe amplifier for Wireless LAN applications and is fully compliant with IEEE802.11a, 11b and 11g standards with data rates up to 54 Mbit/s in 802.11a and 11g mode. The PMB 8825 is designed to form an Infineon WLAN chipset in combination with the PMB 8680 dual-band RF Transceiver, the PMB 8787 dual-band Modem IC (PHY) and the PMB 8789 MAC IC. WirelessLAN Applications Features ■ Enhanced bipolar technology (SiGe) ■ High data-rate wireless LAN ■ ■ Dual-band and dual-mode solution ■ PC card wireless LAN adapters Single +3.3 V supply voltage ■ (Mini) PCI wireless LAN cards ■ Highly linear PA for OFDM and DSSS/CCK ■ CardBus wireless LAN adapters ■ Low EVM for 64 QAM/54 Mbit/s ■ Compact flash wireless LAN cards ■ Low power droop ■ USB wireless LAN adapters ■ Analog power control for both bands ■ Wireless LAN modules, access points, bridge ■ Digital band select (2.4 GHz/5 GHz) ■ Digital standby mode ■ Integrated power detector with buffer for power products, and point-to-multipoint systems control loop ■ Operating ambient temperature: -40 ... +85°C ■ Small size VQFN-24 package with heat sink P M B 8 8 2 5 Dual-Band Power Amplifier N e v e r s t o p t h i n k i n g . P R O D U C T VCC5 VCC6 1st Driver Stage RF Input 5 GHz Interstage Matching Block Diagram BREF 2nd Driver Stage Output Stage Interstage Matching B R I E F RF Output 5 GHz 5 GHz Frequency Bands ■ Diode + Temp. Compensation 2.4 GHz ... 2.5 GHz Band - Psat = 30 dB - P1dB = 27 dBm VCC Enable Band Select Power Control Band Gap Analog Power Control - Gain = 31 dB Band Select Biasing ■ Power Detect Standby 5.15 GHz ... 5.825 GHz Band - Psat = 27 dBm - P1dB = 24 dBm - Gain = 22 dB RF Input 2 GHz Interstage Matching 1st Driver Stage 2nd Driver Stage VCC1 2 GHz Interstage Matching Diode + Temp. Compensation RF Output 2 GHz Output Stage VCC2 Example: Power Control Loop for WLAN System (simplified) PMB 8825 5 GHz PGC Mixed Signal RF Diode 2 GHz PGC Diode HW + SW Bus PMB 8680 PA_PDT OP PA_ON 50 Ω Fronted OP DAC PA_ON 50 Ω Fronted OP Biasing ADC Matching PMB 8787 BB-PHY IC Matching RF-Transceiver IC PC Logic PAON PDT Analog power control with a 10 dB dynamic range to optimize efficiency at all power levels. Type Sales Code Package WLAN Power Amplifier PMB 8825 P-VQFN-24 How to reach us: http://www.infineon.com Published by Infineon Technologies AG, St.-Martin-Strasse 53, 81669 München © Infineon Technologies AG 2003. All Rights Reserved. Attention please! The information herein is given to describe certain components and shall not be considered as warranted characteristics. Terms of delivery and rights to technical change reserved. We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. Infineon Technologies is an approved CECC manufacturer. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office in Germany or our Infineon Technologies Representatives worldwide. Published by Infineon Technologies AG Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in lifesupport devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life-support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered. Printed in Germany PS 03031. NB