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1. 发明授权

US5991612A Amplitude correction circuit 失效
标题翻译：振幅校正电路
公开(公告)号：US5991612A
公开(公告)日：1999-11-23
申请号：US821446
申请日：1997-03-21
申请人： Masahisa Saito
发明人： Masahisa Saito
IPC分类号： H03D7/14 , H03J7/04 , H04B1/16 , H04B1/26 , H04B1/06
CPC分类号： H03D7/14 , H03J7/04 , H04B1/26
摘要： With the circuit construction of a heterodyne receiver, a control circuit for correcting the amplitude level of a local oscillation signal according to an output signal of a detector circuit is connected to the output terminal of an amplifier for amplifying the local oscillation signal to set the amplitude level of the local oscillation signal input to the mixer to an adequate level.
摘要翻译：利用外差接收器的电路结构，根据检测器电路的输出信号校正本地振荡信号的振幅电平的控制电路连接到放大器的输出端子，用于放大本地振荡信号以设定振幅将本地振荡信号输入混频器的电平达到足够的水平。

2. 发明授权

US5781851A Heterodyne receiver 失效
标题翻译：外差接收机
公开(公告)号：US5781851A
公开(公告)日：1998-07-14
申请号：US545197
申请日：1995-10-19
申请人： Masahisa Saito
发明人： Masahisa Saito
IPC分类号： H04B1/10 , H04B1/18 , H04B1/26
CPC分类号： H04B1/26 , H04B1/109
摘要： A heterodyne receiver of the present invention is of a heterodyne system including a voltage controlled circuit and a phase locked loop circuit. The receiver further includes a tuned voltage signal compensating circuit adapted to deliver a frequency passband compensating signal to a bandpass filter on the basis of a variation of an output signal obtained as a result of comparison made between a tuned voltage signal from the phase locked loop circuit and a detected signal from a detector. The heterodyne circuit can obtain a stable nearby frequency selectivity characteristic even in the case where there arises a temperature variation in the receiver.
摘要翻译：本发明的外差接收器是包括压控电路和锁相环电路的外差系统。接收器还包括调谐电压信号补偿电路，其适于基于作为在来自锁相环电路的调谐电压信号之间的比较结果获得的输出信号的变化而将带通补偿信号传送到带通滤波器和来自检测器的检测信号。即使在接收机中出现温度变化的情况下，外差电路也可以获得稳定的附近频率选择性。

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