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AIROC™ Bluetooth® LE module
Integrated radio transceiver
7
Integrated radio transceiver
The CYBLE-3x307x-02 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. The CYBLE-3x307x-02 is fully compliant with the
Bluetooth® LE 5.0 Radio Specification and meets or exceeds the requirements to provide the highest communi-
cation link quality of service.
7.1
Transmitter path
The CYBLE-3x307x-02 features a fully integrated transmitter. The baseband transmit data is GFSK modulated in
the 2.4 GHz ISM band.
7.1.1
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.
7.1.2
Power amplifier
The CYW20835 has an integrated power amplifier (PA) that can transmit up to +10 dBm for class 1 operations.
7.2
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 to ensure reliable operation in the noisy 2.4 GHz ISM band. The front-end topology, with built-in
out-of-band attenuation, enables the CYBLE-3x307x-02 to be used in most applications with minimal off-chip
filtering.
7.2.1
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.
7.2.2
Receiver signal strength indicator
The radio portion of the CYBLE-3x307x-02 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.
7.3
Local oscillator generation
The local oscillator (LO) provides fast frequency hopping (1600 hops/second) across the 39 maximum available
channels. The LO generation sub-block employs an architecture for high immunity to LO pulling during PA
operation. The CYBLE-3x307x-02 uses an internal loop filter.
7.4
Calibration
The CYBLE-3x307x-02 radio transceiver features an automated calibration scheme that is fully self-contained in
the radio. No user interaction is required during normal operation or during manufacturing to provide optimal
performance. Calibration tunes the performance of all the major blocks within the radio to within 2% of optimal
conditions, including gain and phase characteristics of filters, matching between key components, and key gain
blocks. This takes into account process variation and temperature variation. Calibration occurs transparently
during normal operation during the settling time of the hops, and calibrates for temperature variations as the
device cools and heats during normal operation in its environment.
Preliminary Datasheet
24 of 58
002-33419 Rev. **
2021-07-22
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