BCM4330 Preliminary Data Sheet
Bluetooth Radio
Bluetooth Radio
The BCM4330 has an integrated radio transceiver that has been optimized for use in 2.4 GHz Bluetooth wireless
systems. It has been designed to provide low-power, low-cost, robust communications for applications
operating in the globally available 2.4 GHz unlicensed ISM band. It is fully compliant with the Bluetooth Radio
Specification and EDR specification and meets or exceeds the requirements to provide the highest
communication link quality of service.
Transmit
The BCM4330 features a fully integrated zero-IF transmitter. The baseband transmit data is GFSK-modulated in
the modem block and upconverted to the 2.4 GHz ISM band in the transmitter path. The transmitter path
consists of signal filtering, I/Q upconversion, output power amplifier, and RF filtering. The transmitter path also
incorporates /4–DQPSK for 2 Mbps and 8–DPSK for 3 Mbps to support EDR. The transmitter section is
compatible to the Bluetooth Low Energy specification. The transmitter PA bias can also be adjusted to provide
Bluetooth Class 1 operation.
Digital Modulator
The digital modulator performs the data modulation and filtering required for the GFSK, /4–DQPSK, and 8–
DPSK signal. The fully digital modulator minimizes any frequency drift or anomalies in the modulation
characteristics of the transmitted signal and is much more stable than direct VCO modulation schemes.
Digital Demodulator and Bit Synchronizer
The digital demodulator and bit synchronizer take the low-IF received signal and perform an optimal frequency
tracking and bit-synchronization algorithm.
Power Amplifier
The fully integrated PA supports Class 1 or Class 2 output using a highly linearized, temperature-compensated
design. This provides greater flexibility in front-end matching and filtering. The fully integrated PA supports
Class 1 and Class 2 output using a temperature-compensated, auto-transformer-based design. This provides a
simplified front end that does not require off-chip components for matching and better efficiency. External
filtering is required for meeting Bluetooth and regulatory harmonic and spurious requirements. For integrated
mobile handset applications where the Bluetooth is integrated next to the cellular radio, minimal external
filtering can be applied to achieve near thermal noise levels for spurious and radiated noise emissions. The
transmitter features a sophisticated on-chip transmit signal strength indicator (TSSI) block to keep the absolute
output power variation within a tight range across process, voltage, and temperature.
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BROADCOM
BCM4330 Preliminary Data Sheet
April 28, 2011 • 4330-DS304-RI
Page 40
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