公开(公告)号：US4158179A

公开(公告)日：1979-06-12

申请号：US788993

申请日：1977-04-19

申请人： Kazumasa Sakai ,  Tatsuhiko Okuma

发明人： Kazumasa Sakai ,  Tatsuhiko Okuma

IPC分类号： H03F1/02 ,  H03F3/72 ,  H03G3/30 ,  H03F3/04

CPC分类号： H03F3/72 ,  H03F1/0244 ,  H03G3/3026

摘要： An amplifier circuit having an input adapted to receive a signal to be amplified from a signal source, at least two sets of combined amplifying transistors and associated power sources for the amplifying transistors, the two sets constituting first and second amplifying stages, a switching transistor for automatically switching the amplifying operation of the amplifier circuit from the first amplifying stage to the second amplifying stage depending upon the amplitude of the input signal to the amplifier and a load to which the amplifying transistors are connected in parallel.

摘要翻译： 一种放大器电路，具有适于从信号源接收要被放大的信号的输入端，用于放大晶体管的至少两组组合放大晶体管和相关联的功率源，所述两组构成第一和第二放大级;开关晶体管， 根据到放大器的输入信号的幅度和放大晶体管并联连接的负载，自动地将放大器电路的放大操作从第一放大级切换到第二放大级。

公开(公告)号：US4472688A

公开(公告)日：1984-09-18

申请号：US386622

申请日：1982-06-09

申请人： Funada Saburo ,  Tatsuhiko Okuma ,  Kazumasa Sakai

发明人： Funada Saburo ,  Tatsuhiko Okuma ,  Kazumasa Sakai

IPC分类号： H03F1/02 ,  H03F3/04 ,  H03F3/26

CPC分类号： H03F1/0244

摘要： A voltage switching amplifier circuit has a comparator which, after comparing signal amplitude to a comparison voltage, switches on a high voltage or low voltage amplifier depending upon whether the comparison voltage is exceeded or not. After the predetermined comparison voltage is exceeded, a positive feedback circuit reduces the comparison voltage enabling the high voltage amplifier to continue operation at least until the signal amplitude drops below the reduced comparison voltage. In a preferred embodiment, a time constant circuit maintains the high voltage amplifier in operation for a predetermined period of time during which the signal amplitude has dropped below and remained below the reduced comparison voltage.

摘要翻译： 电压开关放大器电路具有比较器，其在将信号幅度与比较电压进行比较之后，根据是否超过比较电压来接通高压或低压放大器。 在超过预定比较电压之后，正反馈电路减小比较电压，使得高电压放大器至少直到信号幅度降低到降低的比较电压以下来继续工作。 在优选实施例中，时间常数电路将高电压放大器保持工作在预定的时间段内，在该预定时间段期间，信号幅度已经降到低于并且保持低于降低的比较电压。

公开(公告)号：US4331930A

公开(公告)日：1982-05-25

申请号：US110540

申请日：1980-01-08

申请人： Isumi Shibata ,  Kazumasa Sakai ,  Nobuyuki Sanpei

发明人： Isumi Shibata ,  Kazumasa Sakai ,  Nobuyuki Sanpei

IPC分类号： H03F1/02 ,  H03F1/08 ,  H03F3/20 ,  H03F3/30

CPC分类号： H03F1/0261 ,  H03F3/3071

摘要： A bias circuit for single-ended push-pull amplifiers permits class A or class AB operation while substantially reducing the idling current of the output transistors at low input signal levels. The bias circuit includes a DC current limiting circuit comprised of transistors that are connected between the common output of the amplifier and the bases of the output transistors. The transistors of the DC current limiting circuit limit the idling currents of the output transistors when there is no input signal applied to the amplifier. The bias circuit further includes RC/diode circuits which operate to increase or decrease the bias voltages of the transistors of the DC current limiting circuit corresponding to a decrease or an increase of the output voltage of the amplifier. In this way, the idling currents of the output transistors are changed so as to effectively follow the input signal power.

摘要翻译： 用于单端推挽放大器的偏置电路允许A类或AB类工作，同时在低输入信号电平下显着降低输出晶体管的空载电流。 偏置电路包括由连接在放大器的公共输出端和输出晶体管的基极之间的晶体管构成的直流限流电路。 当没有输入信号施加到放大器时，直流限流电路的晶体管限制了输出晶体管的空载电流。 偏置电路还包括RC /二极管电路，其操作以增加或减少对应于放大器的输出电压的降低或增加的直流限流电路的晶体管的偏置电压。 以这种方式，改变输出晶体管的空载电流，以有效地跟随输入信号功率。

公开(公告)号：US4194166A

公开(公告)日：1980-03-18

申请号：US874203

申请日：1978-02-01

申请人： Kazumasa Sakai ,  Hiroshi Watanuki

发明人： Kazumasa Sakai ,  Hiroshi Watanuki

IPC分类号： H03F3/343 ,  H03F3/34 ,  H03F3/347 ,  H03F3/45

CPC分类号： H03F3/45381

摘要： In a differential amplifier having a current mirror circuit, the improvement where the collectors of a pair of transistors comprising the current mirror circuit are respectively connected to the bases of a pair of transistors of polarity reverse that of the current mirror transistors, the collectors of the reversed polarity transistors are connected to a power supply, the emitters of the reversed polarity transistors are connected to corresponding active elements of the differential amplifier, and resistors are respectively connected between the bases and emitters of the reversed polarity transistors.

摘要翻译： 在具有电流镜电路的差分放大器中，包括电流镜电路的一对晶体管的集电极分别连接到极性与电流镜晶体管的晶体管极性相反的晶体管的基极的改进， 反极性晶体管连接到电源，反极性晶体管的发射极连接到差分放大器的相应有源元件，电阻分别连接在反极性晶体管的基极和发射极之间。

公开(公告)号：US4288755A

公开(公告)日：1981-09-08

申请号：US064434

申请日：1979-08-07

申请人： Kazumasa Sakai

发明人： Kazumasa Sakai

IPC分类号： H03F1/42 ,  H03F1/52 ,  H04R3/00 ,  H03F3/04

CPC分类号： H03F1/52

摘要： A low pass filter is connected to a junction of a direct-coupled amplifier. The amplifier has a single-ended push-pull output stage consisting of two output transistors and series-connected two resistors. The output transistors are connected to a positive and negative d-c power sources, respectively. The series-connected two resistors are interposed between the two output transistors and defines an intermediate point therebetween at which substantially zero d-c voltage prevails when the amplifier is functioning normally. The junction of the amplifier, to which the low pass filter is connected, is between one of the output transistors and the series-connected resistors. The low pass filter is supplied with the voltage at the junction and applies its output to following isolating means. The means responds to the output of the low pass filter for isolating the intermediate point from a load device connected thereto.

摘要翻译： 低通滤波器连接到直流耦合放大器的结。 放大器具有由两个输出晶体管和串联连接的两个电阻组成的单端推挽输出级。 输出晶体管分别连接到正极和负极d-c电源。 串联的两个电阻器插在两个输出晶体管之间，并且在放大器正常工作之间定义了一个中间点，在该中间点基本上为零d-c电压。 低通滤波器连接到的放大器的结点在输出晶体管和串联电阻之间。 低通滤波器在接点处提供电压，并将其输出提供给以下隔离装置。 该装置响应低通滤波器的输出，以将中间点与连接到其的负载装置隔离。

公开(公告)号：US4152662A

公开(公告)日：1979-05-01

申请号：US874202

申请日：1978-02-01

申请人： Kazumasa Sakai ,  Hiroshi Watanuki

发明人： Kazumasa Sakai ,  Hiroshi Watanuki

IPC分类号： H03F3/45 ,  H03F3/04

CPC分类号： H03F3/45071 ,  H03F2200/372

摘要： In a preamplifier having integrated circuitry, the improvement where the active elements of the first stage amplification of the preamplifier and the resistor which establishes the current flowing through these active elements are mounted on the outside of the integrated circuitry and the connecting terminals for the active elements and resistor are disposed with the remaining preamplifier components inside the integrated circuitry.

摘要翻译： 在具有集成电路的前置放大器中，其中前置放大器的第一级放大的有源元件和建立流过这些有源元件的电流的电阻器安装在集成电路的外部，并且用于有源元件的连接端子 并且电阻器与集成电路内的剩余前置放大器部件一起布置。