P
R O D U C T
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.
B
R I E F
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 ... +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
V
CC5
1
st
Driver
Stage
RF
Input
5 GHz
Interstage
Matching
B
R I E F
V
CC6
2
nd
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
-
P
sat
= 30 dB
-
P
1dB
= 27 dBm
- Gain = 31 dB
V
CC
Enable
Band
Select
Power
Control
Analog Power
Control
Standby
Band
Gap
Band Select
Biasing
Power
Detect
■
5.15 GHz ... 5.825 GHz Band
-
P
sat
= 27 dBm
-
P
1dB
= 24 dBm
- Gain = 22 dB
RF
Input
2 GHz
1
st
Driver
Stage
Interstage
Matching
Interstage
Matching
2
nd
Driver
Stage
2 GHz
Output
Stage
Diode + Temp.
Compensation
RF
Output
2 GHz
V
CC1
V
CC2
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
Ω
Fronted
50
Ω
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 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.
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.
Printed in Germany
PS 03031.
NB
Published by Infineon Technologies AG