公开(公告)号：US3725674A

公开(公告)日：1973-04-03

申请号：US3725674D

申请日：1971-07-08

Applicant: MOTOROLA INC

Inventor： SCHAEFFER D ,  WRIGHT L

IPC: H03G3/34 ,  H03K5/08

CPC classification number: H03G3/345

Abstract: An impulse noise blanking circuit for decreasing the impulse noise in a receiver includes a level sensing circuit coupled to a stage in the signal path following the blanking elements, and to at least one amplifier stage in the noise amplifiers which amplify the impulse noise signals. The level sensing circuit senses the level of the on-channel and adjacent channel energy in the signal path and develops a level sensing signal. The level sensing signal is coupled to the noise amplifiers to vary the gain in accordance with the level sensing signals, thereby reducing the blanking rate and the resultant receiver degradation due to an excessive blanking rate. The level sensing circuit includes a field effect transistor amplifier stage and feedback circuitry to minimize the production of undesired intermodulation producing signals therein.

Abstract translation: 用于减小接收机中的脉冲噪声的脉冲噪声消隐电路包括耦合到消隐元件之后的信号路径中的级的电平检测电路，以及放大脉冲噪声信号的噪声放大器中的至少一个放大器级。 电平感测电路感测信号路径中的通道和相邻通道能量的电平，并产生电平感测信号。 电平感测信号被耦合到噪声放大器以根据电平感测信号改变增益，由此减少消隐速率和由于过多消隐速率导致的接收器劣化。 电平感测电路包括场效应晶体管放大器级和反馈电路，以最小化其中不期望的互调产生信号的产生。