蓝牙音频发射模块，发射方案

创杰1621模块，Fully Bluetooth 3.0 + EDR system in 2.4 GHz ISM band.

Combined TX/RX RF terminal simplifies external matching and reduces external antenna switches.

+4dBm output power with level control 20 dB from register control.

For Class2/3, transmitter support without the requirement for external power amplifier and TR switch.

Build-in channel filter.

To avoid temperature variation, temperature sensor with temperature calibration is utilized into bias current and gain control.

Fully integrated synthesizer has been created. There requires no external VCO, varactor diode, resonator and loop filter.