BCM2004 Datasheet, PDF (2/2 Pages) Broadcom Corporation. – BLUETOOTH RADIO FOR QUALCOMM BASED HANDSETS

OVERVIEW
The BCM2004 Bluetooth transceiver is an integrated radio transceiver
that is optimized for use in QUALCOMM MSM-based wireless systems.
The transceiver is Bluetooth 1.1 and 1.2 compliant and is designed to
enable simultaneous operation with any of the radios options, including
GPS, WCDMA, CDMA, and GSM/GPRS.
The BCM2004 is a high-performance radio implemented in digital
CMOS. It incorporates fractional-N frequency generation technology to
synthesize all industry standard reference frequencies for mobile phone
applications. A proprietary self-calibrating VCO structure allows for
both excellent phase noise and fast frequency hopping covering the
entire band.
The receiver front-end consists of a low-noise amplifier and an image
reject mixer. Balanced mixer structures fed by accurate quadrature LO
signals allow an excellent noise figure and strong image rejection.
A low IF frequency allows for high performance amplifier and filter
designs in CMOS. The bandpass filter structure features self-calibration
circuitry that automatically adjusts circuit elements to compensate for
any process variation. This eliminates tuning and ensures that process
and temperature variation are uniform across the devices. The IF
amplifiers provide a limiting function so that the following stages always
get a constant signal level regardless of the RF input level. An RSSI
signal is also generated in these amplifiers for the system to determine
signal strength. The signal is then filtered further, demodulated, and
finally sent to a bit slicer to generate logic level data output.
The GFSK transmit signal is first generated at baseband in a proprietary
modulator. It is then filtered and upconverted to RF using the quadrature
LO signals. Four output power levels are digitally programmable from
full power to low power in 4-dB steps.
The BCM2004 has a fully integrated T/R switch and associated
matching circuits. This eliminates the need for any external inductors or
active components.
The BCM2004 is controlled via a QUALCOMM proprietary baseband
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.
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2004-PB02-R
10/24/03
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