BCM20730 Data Sheet
Integrated Radio Transceiver
Integrated Radio Transceiver
The BCM20730 has an integrated radio transceiver that is optimized for 2.4 GHz Bluetooth® wireless systems.
It has been designed to provide low power, low cost, and robust communications for applications operating in
the globally available 2.4 GHz unlicensed ISM band. It is fully compliant with Bluetooth Radio Specification 3.0
and meets or exceeds the requirements to provide the highest communication link quality of service.
Transmitter Path
The BCM20730 features a fully integrated transmitter. The baseband transmit data is GFSK modulated in the
2.4 GHz ISM band.
Digital Modulator
The digital modulator performs the data modulation and filtering required for the GFSK signal. The fully digital
modulator minimizes any frequency drift or anomalies in the modulation characteristics of the transmitted
signal.
Power Amplifier
The BCM20730 has an integrated power amplifier (PA) that can transmit up to +4 dBm for class 2 operation.
Receiver Path
The receiver path uses a low IF scheme to downconvert the received signal for demodulation in the digital
demodulator and bit synchronizer. The receiver path provides a high degree of linearity, an extended dynamic
range, and high-order, on-chip channel filtering to ensure reliable operation in the noisy 2.4 GHz ISM band. The
front-end topology, which has built-in out-of-band attenuation, enables the BCM20730 to be used in most
applications without off-chip filtering.
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.
Receiver Signal Strength Indicator
The radio portion of the BCM20730 provides a receiver signal strength indicator (RSSI) to the baseband. This
enables the controller to take part in a Bluetooth power-controlled link by providing a metric of its own receiver
signal strength to determine whether the transmitter should increase or decrease its output power.
BROADCOM
®
September 9, 2013 • 20730-DS108-R
Page 23
BROADCOM CONFIDENTIAL
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