PMB8825 INFINEON | Alldatasheet
Document overview
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Technical content
Features
■ Enhanced bipolar technology (SiGe) ■ Dual-band and dual-mode solution ■ Single +3.3 V supply voltage ■ 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 ... +85°C ■ Small size VQFN-24 package with heat sink
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 PMB 8825 Dual-Band Power Amplifier 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 compli- ant 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.
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© 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 dan- gerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life- support 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 intend- ed 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. Published by Infineon Technologies AG P RODUCT B RIEF Type Sales Code Package WLAN Power Amplifier PMB 8825 P-VQFN-24 Block Diagram Analog Power Control Standby Band Gap Band Select Biasing 1st Driver Stage Diode + Temp. Compensation Interstage Matching Interstage Matching 5 GHz 2nd Driver Stage Output Stage 1st Driver Stage Diode + Temp. Compensation Interstage Matching Interstage Matching
2 GHz
5 GHz
- Psat = 30 dB - P1dB = 27 dBm - Gain = 31 dB - Psat = 27 dBm - P1dB = 24 dBm - Gain = 22 dB Biasing Logic OP OP Diode Diode OP PMB 8825 RF
5 GHz PGC
2 GHz PGC
PA_PDT PA_ON PA_ON PC PAON PDT Matching 50 Ω Fronted 50 Ω Fronted Matching Analog power control with a 10 dB dynamic range to optimize efficiency at all power levels. Example: Power Control Loop for WLAN System (simplified) Printed in Germany PS 03031. NB