再生式变频器的原理电路及其增益与选择性

分析了晶体管混频原理,提出引入再生的理论依据。实验证明,在变频电路中引入再生后,灵敏度大大提高,可以增加约15———20dB的增益;并且提高了邻近频道选择性,有效地抑制了超外差式接收机特有的中频干扰和像频干扰。采用再生式变频电路的无线电接收机(也称为再生超外差式接收机),具有简单、高效、经济、噪声小等优点。

The theoretical circuit,gain and selectivity of the regenerative frequency converter

The theoretical warranty of inducti regeneration after analyzi the mixed frequency principles of transistor.Experiments prove that the induction of regeneration in converter circuit can greatly raise the sensitivity,increasing the gain of 15-20dB,and that adjacent-channel selectivity is raised,the especial disturbance of intermediate frequency and disturbance of image frequency of superheterodyne receiver are curbed availably.Adoping the radio receiver of the regenerative converter circuit(regenerative superheterodyne receiver) possesses the advantages of simplicity,high efficience,economy,little noise and so on.