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BCM2051
PRODUCT
BCM2051
BCM2051
Brief
RADIO
OF BENEFITS
802.11B
SUMMARY
FEATURES
Zero IF, conversion radio integrates * completesingle-chip direct IF. 802.11b RF and Fully external * count integrated VCO minimizescost. component and reduces overall BOM * Single 2.7V to 3.3V voltage supply. Operation over extended * robust radio performancetemperature range provides in integrated laptop and embedded designs. Highly linear * free operation.receive path ensures robust, interferenceExceptional and out-of-band blocking * mitigates theadjacentofchannelwireless LAN, Bluetooth, effects other and microwave oven effects.
Monolithic implementation in a standard digital * CMOS process with minimal external components provides a manufacturable low-cost 802.11b RF/IF solution. On-chip auto-calibration eliminates process variation * across components and mitigates temperature variation, enabling it to be used in high-volume applications. Performance is * performance in optimized to ensure the robust real-world operating environments. Low power consumption * power wireless solutions. enables integration into lowMinimum * solution forexternal BOM provides the lowest cost 802.11b radio solutions.
802.11b Application
Balun
BCM2051 802.11b Radio
Diversity Switch & BPF T/R Switch Power Amp
BCM4301 802.11b MAC & BB
System Interface
Balun
Crystal
BROADCOM PROPRIETARY & CONFIDENTIAL
BCM2051
OVERVIEW
BCM2051 802.11b Radio
Automatic Calibration Control Control and Data Interface I/Q Output RF Input
LO Generation
PLL Frac N
RF Output
I/Q Input
The BCM2051 802.11b zero IF Radio is an integrated transceiver device that has been optimized for use in 2.4-GHz 802.11b wireless systems. It has been designed to provide lowpower, low-cost, and robust communications for applications operating in the globally available 2.4-GHz unlicensed ISM band. It is fully compliant with the 802.11b specification and meets or exceeds the requirements where appropriate to provide the highest communication link quality of service. The BCM2051 features a simple, innovative shared LO architecture that allows a high-performance radio implementation in a single CMOS chip. A proprietary PLL design generates quadrature LO signals in the 2.4-GHz band for both the transmitter and receiver. The PLL is locked to a 12-MHz free running crystal oscillator. A proprietary self-calibrating VCO is fully integrated and does not require external VCO or tank circuits. This creates a frequency agile LO, ensures the lowest phase noise performance and covers the full 2.4-GHz ISM band. The receiver front end consists a low noise amplifier, a single side band mixer and on-chip low pass filter, which provide good performance without a costly external IF band pass filter. Because the entire receive channel is one chip, all sensitive components are eliminated from the board design and this leads to the most robust and noise-immune design, optimal for integration in laptop computers and embedded applications.
An overall noise figure of 6 dB is achieved along with 85-dB gain which can acheive -84-dBm sensitivity for 11-Mbps CCK modulation. The internal lowpass filter structure also features DC cancellation loop and self-calibration circuitry, which automatically adjusts circuit elements to compensate for any process variation. This eliminates tuning and ensures that the devices are uniform across process variation and temperature. An RSSI signal is also generated in these amplifiers for the system to determine signal strength. The output is a stable I/Q output for direct interface to the BCM430X series of baseband/MAC components. The transmit signal is input through the I/Q input from the baseband. It is then filtered and upconverted to RF using the quadrature LO signals. The signal is then boosted to a minimum 1-mW output power level by an internal power amplifier. The output signal is optimized to enable easy integration with widely available power amplifiers and minimizes the linearity requirements for these devices. Output power control is digitally programmable from full power to low power in 4-dB steps. The BCM2051 is controlled directly from the baseband and MAC through a fully digital control interface. This interface provides control for the various sections of the chip, defines data transfers and allows access to the various internal registers of the device. The BCM2051 is in a 64-pin LPCC package.
Broadcom(R) and the pulse logo(R) are trademarks of Broadcom Corporation and/or its subsidiaries in the United States and certain other countries. All other trademarks are the property of their respective owners.
For more information please contact us at: Phone: 949-450-8700, FAX: 949-450-8710 Email: info@broadcom.com
Visit our web site at: www.broadcom.com
(c) 2001 by BROADCOM CORPORATION. All rights reserved. 2051-PB00-R-11.7.01
BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013 BROADCOM PROPRIETARY & CONFIDENTIAL

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