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1. 发明专利

JP2001144547A HOWLING PREVENTION CIRCUIT 失效
公开(公告)号：JP2001144547A
公开(公告)日：2001-05-25
申请号：JP2000275461
申请日：2000-09-11
申请人： NIITANI TOSHIMITSU , NIITANI FUMIKO , NIITANI YOSHIYUKI , NIITANI ICHIRO , NIITANI TSUTOMU
发明人： NIITANI TOSHIMITSU
IPC分类号： H04R3/02 , H03F1/08 , H03F1/42 , H03F3/181 , H04M1/00 , H04M1/60
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.

2. 发明专利

JP2000174566A SIGNAL DISCRIMINATION CIRCUIT USING INSTANTANEOUS RECOVERY CIRCUIT 失效
公开(公告)号：JP2000174566A
公开(公告)日：2000-06-23
申请号：JP37664798
申请日：1998-12-03
申请人： NIITANI TOSHIMITSU , NIITANI FUMIKO , NIITANI YOSHIYUKI , NIITANI ICHIRO , NIITANI TSUTOMU
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.

3. 发明专利

JPS63178608A HIGH FIDELITY NEGATIVE FEEDBACK CIRCUIT USED ALSO FOR ULTRA BROAD BAND SIMULTANEOUS TWO-WAY COMMUNICATION AMPLIFIER 失效
公开(公告)号：JPS63178608A
公开(公告)日：1988-07-22
申请号：JP970987
申请日：1987-01-19
申请人： NIITANI TOSHIMITSU
发明人： NIITANI TOSHIMITSU
IPC分类号： H03F1/34 , H03F3/62
摘要： PURPOSE:To prevent the oscillation even with lots of negative feedback by providing a proper amplifier circuit whose signal discrimination neutral point is connected to an input terminal, making the phase of an output reception signal is opposite in phase with that of the reception signal at the collector of the signal discrimination circuit and connecting both the circuits. CONSTITUTION:Suppose that a positive transmission signal is inputted to a base of a transistor(TR)TR1 for amplifying a transmission signal, then the signal is amplified at the collector with a negative polarity and a current flows to a load resistor TR11. Thus, the current is amplified by a transmission output TR3 and inputted to a base of a signal discrimination TR10 at the output side used in common with negative feedback operation automatically. Since a negative feedback circuit (comprising R6, R7 and C3) is provided from the collector of the input side signal discrimination TR9 to the base, the current is equal to the current flowing to the output side emitter resistor R5 and the transmission signal having the opposite phase flows easily to the emitter resistor R4.

4. 发明专利

JP2000138538A BROAD-BAND AMPLIFIER CIRCUIT AND APPLICATION DEVICE USING THE CIRCUIT 失效
公开(公告)号：JP2000138538A
公开(公告)日：2000-05-16
申请号：JP20220999
申请日：1999-07-15
申请人： NIITANI TOSHIMITSU , NIITANI FUMIKO , NIITANI YOSHIYUKI , NIITANI ICHIRO , NIITANI TSUTOMU
发明人： NIITANI TOSHIMITSU
IPC分类号： H04R3/02 , H03F1/02 , H03F1/08 , H03F1/42 , H03F3/08 , H03F3/62 , H03K3/037
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.

5. 发明专利

JPH02206211A ULTRA BROAD BAND SIGNAL DISCRIMINATING CIRCUIT WITHOUT MATRIX CIRCUIT 失效
公开(公告)号：JPH02206211A
公开(公告)日：1990-08-16
申请号：JP2632589
申请日：1989-02-03
申请人： NIITANI TOSHIMITSU
发明人： NIITANI TOSHIMITSU
IPC分类号： H03F3/62 , H04L5/14
摘要： PURPOSE:To attain communication of ultra broad band and high amplification factor by utilizing a base current of a transistor(TR) whose collector is provided with a switch circuit closed with respect to a transmission signal and opened with respect to a reception signal and whose emitter receives both voltages of the transmission signal and the reception signal as the signal discrimination action. CONSTITUTION:Since a very small reception signal flows to a collector resistor R9, a reception signal current largely amplified flows to the collector of a TR17. In such a case, a collector output electromotive force of signal discrimination Trs 10-12 is suppressed properly by providing a base resistance R10 and a TR13 showing a large output resistance with respect to the reception signal is provided to the collector, then most of the reception signal current amplified by the TR17 flows from emitters of signal discrimination TRs 10-12 to the reception amplifier input resistor R11 via a base resistance R10.

6. 发明专利

JPS60226224A DISCRIMINATING CIRCUIT OF ULTRAWIDE BAND HIGH BALANCE SIGNAL 失效
公开(公告)号：JPS60226224A
公开(公告)日：1985-11-11
申请号：JP8332484
申请日：1984-04-24
申请人： NIITANI TOSHIMITSU
发明人： NIIYA TOSHIMITSU
IPC分类号： H04B3/03 , H04B1/58
摘要： PURPOSE:To attain neutralization of a communication line with simple circuit constitution by connecting a transistor (TR) for cancelling a reception signal in parallel with any bridge forming element in contact with a transmission/reception line. CONSTITUTION:A transmission output voltage of a TR1 is divided by a collector resistor R2 and an emitter resistor R3 of output TR3 in Darlington connection with the TR2 and fed to a transmission/reception transformer T. Since the transmission signal given to the base of the TR4 for cancelling a reception signal is adjusted by a variable resistor VR to an equi-potential with the level of the emitter in this case, the TR4 is not activated. Thus, in selecting transmission signal neutralization resistors R4, R5 as R5/R3=R4/R2, no transmission signal is leaked between a neutralizing point A and ground. On the other hand, when a reception signal is inputted, since the TR4 is activated, the reception signal is extracted largely from the neutralizing point A when the emitter equalizing resistance of the TR3 is much decreased.

7. 发明专利

JPH0243825A TRANSMISSION SIGNAL, SPLIT, CANCEL TYPE SINGLE CHANNEL SIMULTANEOUS BIDIRECTIONAL COMMUNICATION EQUIPMENT 失效
公开(公告)号：JPH0243825A
公开(公告)日：1990-02-14
申请号：JP19386088
申请日：1988-08-03
申请人： NIITANI TOSHIMITSU
发明人： NIITANI TOSHIMITSU
IPC分类号： H04B1/54 , H04L5/14
摘要： PURPOSE:To realize a single channel simultaneous bidirectional communication equipment with ultra broad band, high fidelity and high amplification factor by adopting a circuit in which a transmission signal itself is split and the split signals are cancelled together. CONSTITUTION:When a transmission signal is given to a transmission signal amplification transistor(TR) TR1, the transmission signal with nearly the same phase is given to a gate of a signal discrimination transistor FET1 and a transmission signal flows to a drain circuit. Since Wilson current mirror circuits TR8-TR10 are provided on the drain circuit, when the resistances of emitter resistors R2, R3 are selected identical, the emitter current of the FET1 and the emitter current of a transmission signal switch TR12 are equal to each other. When the resistances of resistors R5, R6 are selected identical, no transmission signal is leaked to an output resistor R7 of a differential operational amplifier A1. Thus, a single channel simultaneous bidirectional communication equipment with ultra broad band, high fidelity and high amplification factor is realized with a simple circuit.

8. 发明专利

JPS59183536A Ultra-broad band high balance signal discriminating circuit 失效
标题翻译：超宽带高平衡信号辨别电路
公开(公告)号：JPS59183536A
公开(公告)日：1984-10-18
申请号：JP5831883
申请日：1983-04-01
申请人： Niitani Toshimitsu
发明人： NIIYA TOSHIMITSU
IPC分类号： H04B3/03 , H04B1/58
CPC分类号： H04B1/58
摘要： PURPOSE:To suppress the oscillation of a circuit by increasing a switching frequency several times higher than the maximum frequency of a transmission/reception signal to prevent a transmission output from leaking to a receiving side. CONSTITUTION:The transmission signal is inputted to a gate of a transmission output transistor FET1, a drain circuit is provided with a series circuit comprising a transmission and reception line T and a switching element FET2, and resistors R1, R2 having a resistance value of several ohms are connected across an FET2. Then, a pulse having a frequency twice or over the transmission signal frequency is applied to a gate of the FET2. Thus, the integrated waveform across the switching element FET2 is similar to that of the transmission signal and they are in-phase to each other then they are cancelled with each other and no transmission signal is leaked to the output side by adjusting the potential to an equal value by a proper method and inputting the result to both input terminals of a differential amplifier OP.
摘要翻译：目的：通过增加比发送/接收信号的最大频率高几倍的开关频率来抑制电路的振荡，以防止传输输出泄漏到接收侧。构成：发送信号被输入到发送输出晶体管FET1的栅极，漏极电路设置有包括发送和接收线T和开关元件FET2的串联电路，电阻器R1，R2的电阻值为几欧姆通过FET2连接。然后，将具有频率两倍以上的频率的脉冲施加到FET2的栅极。因此，开关元件FET2两端的集成波形与发送信号相同，它们彼此同相，因此它们彼此抵消，并且通过将电位调节到一个输出侧，没有发送信号泄漏到输出侧通过适当的方法相等的值，并将结果输入到差分放大器OP的两个输入端。

9. 发明专利

JPS58154938A SWITCHING TYPE 2-WIRE AND 4-WIRE CONVERTING CIRCUIT 失效
公开(公告)号：JPS58154938A
公开(公告)日：1983-09-14
申请号：JP3861182
申请日：1982-03-10
申请人： NIITANI TOSHIMITSU
发明人： NIITANI TOSHIMITSU
IPC分类号： H04B3/03 , H04B1/58
摘要： PURPOSE:To prevent a transmission output from being leaked to a reception side and to ensure the amplification factor, by providing a detection rectifying circuit having transmission and reception lines and a balancer detection rectifying circuit having a transmission signal part of opposite phase and neutralizing the opposite phase parts of the two circuits. CONSTITUTION:An AM modulation carrier wave modulated with a transmission signal applied to a connecting point between switcing elements D1 and D2 connected in series via a coupling capacitor C1 is detected and rectified in opposite phase to each other by the switching elements D1 and D2 and picked up at both ends of a transmission and reception line ZT comprising time constants C3, R2, T1 and of a balancer ZB comprising time constants R1, C2. Thus, a neutralizing point is formed at a point of a variable resistor VR connecting both the circuits. Then, in connecting this neutralizing point to a reception antenna, the transmission signal is transmitted to the line ZT only, allowing to prevent the leakage of the signal to the reception antenna.

10. 发明专利

JPS587906A BI-DIRECTIONAL AMPLIFIER 失效
公开(公告)号：JPS587906A
公开(公告)日：1983-01-17
申请号：JP10675481
申请日：1981-07-07
申请人： NIITANI TOSHIMITSU
发明人： NIITANI TOSHIMITSU
IPC分类号： H03F3/62
摘要： PURPOSE:To improve the factor of amplification by connecting sectional windings, the primary windings of an output transmformer, in parallel between a power source line B and the collector of a transistor (TR) to make the voltage to be outputted to a transmission signal output terminal increase by a low voltage of B. CONSTITUTION:Sectional windings, the primary windings of an output transformer TR1, are connected between a power source line B and the collector of a TR Q1 in parallel through diodes D1-D6 and resistors R1-R3 respectively. CR parallel circuits 3-1, 3-2 are connected between the start and end of each sectional winding. A diode D7 is connectecd in the forward direction from the power source line B, a parallel circuit 3-3 is connected between the negative pole of the diode D7 and the end of the sectional winding W3 and a transmission signal output terminal 4 is located between the negative poles of the diodes D2 and D7. In this way, the voltage to be outputted from the terminal 4 is increased, improving the factor of amplification.

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