怎样设置CC1120的占用带宽(OBW)?
CC1120设置占用带宽的寄存器是不是CHAN_BW? 我们需要将占用带宽设置低于8.5KHz, Smart RF studio 设置RX filter BW 为8.333KHz,CHAN_BW 变为0x18. 但是我们用频谱仪测试时候(测试条件RBW:100HZ,VBW:100Hz,扫宽:50KHz,功率比99%)占用带宽为11KHz。 这里具体怎样设置占用带宽?
Susan Yang:
参考数据手册 http://www.ti.com.cn/cn/lit/ug/swru295e/swru295e.pdf 30页
RX Filter Bandwidth
The CHAN_BW.ADC_CIC_DECFACT and CHAN_BW.BB_CIC_DECFACT register fields control the RX filter BW, together with the CHAN_BW.CHFILT_BYPASS register field and the crystal oscillator frequency. It is recommended to use SmartRF Studio to generate settings for a given RX filter BW.