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公开(公告)号：JP2001144547A
公开(公告)日：2001-05-25
申请号：JP2000275461
申请日：2000-09-11
发明人： NIITANI TOSHIMITSU
摘要： PROBLEM TO BE SOLVED: To provide a howling prevention circuit employing a broadband amplifier circuit that has a comparatively simple circuit configuration and can amplify a signal over a wide frequency band. SOLUTION: The howling prevention circuit employs the broadband amplifier circuit consisting of a signal discrimination circuit that eliminates the same input signal in 1st and 2nd input signals from the 1st input signal and provides an output of the result as an output signal and of an amplifier circuit for the 1st input signal that is provided with an active element having a base corresponding terminal, an emitter corresponding terminal and a collector corresponding terminal and with an input circuit where a counter ground input signal voltage of the emitter corresponding terminal is higher than that of the base corresponding terminal and where the impedance between the collector corresponding terminal and the base corresponding terminal is high for a signal frequency and an output circuit acting like a load is connected between the collector corresponding terminal and the emitter corresponding terminal.
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公开(公告)号：JP2000174566A
公开(公告)日：2000-06-23
申请号：JP37664798
申请日：1998-12-03
发明人： NIITANI TOSHIMITSU
IPC分类号： H03F3/04 , H04B1/3822 , H04B1/40
摘要： PROBLEM TO BE SOLVED: To increase extraction capability of a received signal by more properly setting a transmission signal voltage fed to an instantaneous recovery circuit. SOLUTION: A transmission signal current that flows reverse to this instantaneous recovery circuit and is confluent to a transmission output signal of a collector output circuit to recover the transmission output signal is completely made equal to a transmission signal current leaked to a branch circuit. As a result, the transmission signal current can completely be neutralized resulting in selecting only a reception signal.
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公开(公告)号：JP2000138538A
公开(公告)日：2000-05-16
申请号：JP20220999
申请日：1999-07-15
发明人： NIITANI TOSHIMITSU
摘要： PROBLEM TO BE SOLVED: To provide a broad-band amplifier circuit which has a relatively simple circuitry and can amplify signals in a broad frequency band and an application circuit using the amplifier circuit. SOLUTION: In an amplifier circuit having an input circuit which uses an active element 14 provided with base-, emitter-, and collector-corresponding terminals and in which the input signal voltage from the emitter-corresponding terminal to the earth is higher than that from the base-corresponding terminal to the earth, the signal frequency between the collector- and base-correcting terminals is set at a high impedance and an output circuit 23 which becomes a load is connected between the collector- and emitter-corresponding terminals.
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公开(公告)号：JP2009088822A
公开(公告)日：2009-04-23
申请号：JP2007253972
申请日：2007-09-28
申请人： Niitani Fumiko , Niitani Ichiro , Toshimitsu Niitani , Niitani Tsutomu , Niitani Yoshiyuki , 二井谷 一郎 , 利光 二井谷 , 二井谷 勉 , 二井谷 好行 , 二井谷 富美子
发明人： NIITANI TOSHIMITSU
摘要： PROBLEM TO BE SOLVED: To provide a simultaneous two-way communication system for discriminating a receiving signal from a mixed transmission and reception signal and amplifying the receiving signal. SOLUTION: The simultaneous two-way communication system comprises a circuit 1B1 for amplifying a transmission signal A to output the transmission signal A to an inputting-outputting means 1T1 to be a load, outputting an output signal c1, including an output signal A2 set to be the same as A and amplified and a signal b from 1T1 to an output terminal 1TA3, and outputting a reference output signal a1 being the same as A to an output terminal 1TA2; a circuit 1B2 for outputting a transmission signal B, obtained by discriminating and amplifying only the signal b from 1T1 with a1 and c1 as inputs; a circuit 1B3 for amplifying B and outputting B to an input-output means 1T2 to be a load, outputting an output signal d1, including an output signal B2 set to be the same as B and amplified and the signal a from 1T2 to an output terminal 1TA10, and outputting a reference output signal b1 which is the same as B to an output terminal 1TA12; and a circuit 1B4 for outputting a transmission signal A', obtained by discriminating and amplifying only the signal a from 1T2 with b1 and d1 as inputs to an output terminal 1TA14 to make the transmission signal A' to be A. COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译： 要解决的问题：提供一种同时双向通信系统，用于从混合的发送和接收信号中鉴别接收信号并放大接收信号。 解决方案：同时双向通信系统包括用于放大发送信号A以将发送信号A输出到输入输出装置1T1作为负载的电路1B1，输出包括输出信号的输出信号c1 A2设置为与A相同并放大，信号b从1T1到输出端1TA3，并将与A相同的参考输出信号a1输出到输出端1TA2; 用于输出通过以a1和c1作为输入仅从1T1的信号b进行识别和放大而获得的发送信号B的电路1B2; 用于放大B并将B输出到输入输出装置1T2作为负载的电路1B3，输出包括被设置为与B相同并被放大的输出信号B2和从1T2的信号a输出到输出的输出信号d1 端子1TA10，并将与B相同的基准输出信号b1输出到输出端子1TA12; 以及电路1B4，用于输出通过仅将来自1T2的信号a与b1和d1作为输入的输入端子1TA14进行鉴别和放大而获得的发送信号A'，以使发送信号A'成为A.版权所有： （C）2009，JPO＆INPIT
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