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| PRODUCT 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. BRIEF Features Enhanced bipolar technology (SiGe) Dual-band and dual-mode solution Single +3.3 V supply voltage WirelessLAN Applications High data-rate wireless LAN PC card wireless LAN adapters (Mini) PCI wireless LAN cards CardBus wireless LAN adapters Compact flash wireless LAN cards USB wireless LAN adapters Wireless LAN modules, access points, bridge products, and point-to-multipoint systems Highly linear PA for OFDM and DSSS/CCK Low EVM for 64 QAM/54 Mbit/s Low power droop Analog power control for both bands Digital band select (2.4 GHz/5 GHz) Digital standby mode Integrated power detector with buffer for power control loop Operating ambient temperature: -40 ... +85C Small size VQFN-24 package with heat sink PMB 8825 Dual-Band Power Amplifier Never stop thinking. PRODUCT VCC5 1st Driver Stage RF Input 5 GHz Interstage Matching BRIEF VCC6 2nd Driver Stage Interstage Matching Output Stage BREF Block Diagram 5 GHz Diode + Temp. Compensation RF Output 5 GHz Frequency Bands 2.4 GHz ... 2.5 GHz Band - Psat = 30 dB - P1dB = 27 dBm - Gain = 31 dB VCC Enable Band Select Power Control Analog Power Control Standby Band Gap Band Select Biasing Power Detect 5.15 GHz ... 5.825 GHz Band - Psat = 27 dBm - P1dB = 24 dBm - Gain = 22 dB RF Input 2 GHz 1st Driver Stage Interstage Matching Interstage Matching 2nd Driver Stage 2 GHz Output Stage Diode + Temp. Compensation RF Output 2 GHz VCC1 VCC2 Example: Power Control Loop for WLAN System (simplified) RF-Transceiver IC PMB 8787 BB-PHY IC PMB 8825 Mixed Signal 5 GHz PGC RF 2 GHz PGC Diode HW + SW Bus Biasing PMB 8680 ADC DAC OP PC Logic OP OP Diode Matching Matching 50 Fronted 50 Fronted PA_PDT PA_ON PA_ON PAON PDT Analog power control with a 10 dB dynamic range to optimize efficiency at all power levels. Type WLAN Power Amplifier Sales Code PMB 8825 Package P-VQFN-24 How to reach us: http://www.infineon.com Published by Infineon Technologies AG, St.-Martin-Strasse 53, 81669 Munchen (c) 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. 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 Published by Infineon Technologies AG |
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