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Bluetooth Radio

BCM4354 Data Sheet

BROADCOM CONFIDENTIAL

Broadcom®

October 15, 2014 • 4354-DS109-R

Page 33

Bluetooth Radio

The BCM4354 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 BCM4354 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 or class 2 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. Due to the linear nature of the PA

combined with some integrated filtering, external filtering is required to meet the Bluetooth and regulatory

harmonic and spurious requirements. For integrated mobile handset applications in which Bluetooth is

integrated next to the cellular radio, 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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