This paper discussed the double sideband noise figures and single side band noise figures of the superheterodyne receivers in a ideal hypothesis and the practical case respectively. It also gave some considerations designing the single side band receiver. 分别讨论了在理想假设和实际情况下超外差接收机的双边带噪声系数和单边带噪声系数,给出了单边带接收机的某些设计方案。
In the light of the requirement of technical indexes, the architecture of a superheterodyne RF front-end is analyzed and discussed. A solution of double conversion superheterodyne RF front-end and two digital Automatic Gain Control ( AGC) circuits is proposed. 针对指标要求通过对超外差式前端结构进行分析和讨论,提出了采用两次下变频的超外差式结构及两级数字自动增益控制(AGC)电路的总体解决方案。