readout_program/chapters/04-01-acq-downconversion.md

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## 4.1. 下变频电路配置
来自量子比特RO端口的射频信号需要经过前端模拟电路处理后才能够被读出基带处理单元采集处理。
前端下变频电路包括增益和本振,这里需要注意同一个混频板上四个通道上下变频使用同一个本振信号。
|配置名|描述|
|:-:|:-:|
|lo_freq|变频本振频率设置|
|dn_gain|下变频增益设置|
* lo_freq32比特整数范围[5400000, 5600000]单位是kHz
>目前ez-Q 2.5 FPGA平台暂不支持下变频增益dn_gain 设置;
仅支持 lo_freq 变频本振频率设置单板上下变频通道共享lo_freq设置