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    • 3. 发明授权
    • Power-amplifying circuit
    • 功率放大电路
    • US4330755A
    • 1982-05-18
    • US134302
    • 1980-03-26
    • Hiroyasu YamaguchiTakashi Ishii
    • Hiroyasu YamaguchiTakashi Ishii
    • H03F1/34H03F3/20H03F3/213H03F3/30H03F3/26
    • H03F1/34H03F3/3093
    • A power-amplifying circuit includes a differential amplifier wherein the base of one of the transistors is supplied with an input signal and the collectors of both transistors are respectively supplied with signals amplified in the non-inverting form and the inverting form, two output transistors carrying out a push-pull operation upon receipt of output signals from both transistors of the differential amplifier, third and fourth transistors for detecting output currents from both transistors of the output transistors, and a circuit for supplying a current corresponding to a product of output currents from the first and second transistors to the differential amplifier through a negative feedback path. A compensation resistor is connected to one of the bases and emitters of the third and fourth transistors to counterbalance a parasitic resistance occurring in the first and second transistors.
    • 功率放大电路包括差分放大器,其中一个晶体管的基极被提供有输入信号,并且两个晶体管的集电极分别被提供以非反相形式和反相形式放大的信号,两个输出晶体管携带 在从差分放大器的两个晶体管接收到输出信号时进行推挽操作,用于检测来自输出晶体管的两个晶体管的输出电流的第三和第四晶体管,以及用于提供与来自 第一和第二晶体管通过负反馈路径到差分放大器。 补偿电阻器连接到第三和第四晶体管的基极和发射极之一,以平衡发生在第一和第二晶体管中的寄生电阻。
    • 4. 发明授权
    • Signal intercepting circuit
    • 信号拦截电路
    • US4427949A
    • 1984-01-24
    • US290094
    • 1981-08-04
    • Hiroyasu YamaguchiYasuhiro Kodera
    • Hiroyasu YamaguchiYasuhiro Kodera
    • H03F1/00G11B20/02H03G3/10H03G3/34H03G11/08H03F1/14H03F3/45
    • H03G3/34H03G11/08
    • The muting circuit of the present invention comprises a first and second differential amplifier. The first differential amplifier comprises first and second transistors. The base electrode of the first transistor receives an input signal. The second differential amplifier comprises third and fourth transistors. The collector electrode of the third transistor is connected to the collector electrode of the second transistor, while the collector electrode of the fourth transistor is connected to the collector electrode of the first transistor. A switching circuit, receiving an intercepting signal, is coupled to the first and second differential amplifier. In the absence of an intercepting signal, the switching circuit causes the conduction of the first differential amplifier, and while cutting off the second differential amplifier. Upon receiving an intercepting signal, the switching circuit cuts off the first differential amplifier while it causes the conduction of second differential amplifier. Furthermore, the switching circuit causes the simultaneous conduction of the first and second differential amplifiers during a rising time and falling time of the intercepting signal. A D.C. fluctuation in the output voltage is produced during the time one amplifier is being activated while the other is being cut off. The simultaneous operation of both differential circuits prevents D.C. fluctuations in input voltage supplied to an output transistor. Consequently, the D.C. output potential of an output amplifier does not substantially fluctuate irrespective of the intercepting operation.
    • 本发明的静音电路包括第一和第二差分放大器。 第一差分放大器包括第一和第二晶体管。 第一晶体管的基极接收输入信号。 第二差分放大器包括第三和第四晶体管。 第三晶体管的集电极连接到第二晶体管的集电极,而第四晶体管的集电极连接到第一晶体管的集电极。 接收截取信号的开关电路耦合到第一和第二差分放大器。 在没有截获信号的情况下,开关电路导致第一差分放大器的导通,同时切断第二差分放大器。 当接收到截止信号时,开关电路在第二差分放大器导通时切断第一差分放大器。 此外,开关电路在截止信号的上升时间和下降时间期间引起第一和第二差分放大器的同时导通。 在一个放大器被激活而另一个被切断的时间内产生输出电压的直流变化。 两个差分电路的同时操作防止提供给输出晶体管的输入电压的直流波动。 因此,无论截断操作如何,输出放大器的直流输出电位基本上不会波动。
    • 6. 发明授权
    • Power amplifying circuit
    • 功率放大电路
    • US4333059A
    • 1982-06-01
    • US134676
    • 1980-03-27
    • Hiroyasu YamaguchiTakashi Ishii
    • Hiroyasu YamaguchiTakashi Ishii
    • H03F1/34H03F3/20H03F3/213H03F3/30H03F3/26
    • H03F1/34H03F3/3093
    • A power-amplifying circuit embodying this invention comprises a pre-amplifier for amplifying an input signal, a push-pull amplifier including first and second transistors driven in accordance with an output from the pre-amplifier, and a feedback circuit which detects output currents from the first and second transistors and supplies a current corresponding to a product of output currents from the first and second transistors to the pre-amplifier through a negative feedback path in order to regulate the quiescent currents of the first and second transistors. The push-pull amplifier is driven by a power source having a prescribed level of voltage. The feedback circuit and pre-amplifier are driven by an auxiliary power source whose voltage is obtained by adding through a bootstrap capacitor the output voltage from the push-pull amplifier to a referential voltage slightly lower than the power supply voltage by a resistor.
    • 体现本发明的功率放大电路包括用于放大输入信号的前置放大器,包括根据前置放大器的输出驱动的第一和第二晶体管的推挽放大器以及检测来自前置放大器的输出电流的反馈电路 第一和第二晶体管,并且通过负反馈路径提供对应于来自第一和第二晶体管的输出电流与前置放大器的乘积的电流,以便调节第一和第二晶体管的静态电流。 推挽放大器由具有规定电压电平的电源驱动。 反馈电路和前置放大器由辅助电源驱动,辅助电源的电压通过自举电容器将推挽放大器的输出电压加到略低于电源电压的参考电压而获得。
    • 7. 发明授权
    • Power amplifier
    • 功率放大器
    • US4471322A
    • 1984-09-11
    • US290407
    • 1981-08-05
    • Hiroyasu YamaguchiYasuhiro Kodera
    • Hiroyasu YamaguchiYasuhiro Kodera
    • H03F1/02H03F1/42H03F1/52H03F3/20H03F3/30H03F3/26
    • H03F3/3088H03F1/0261
    • A power amplifier is disclosed which reliably amplifies an input signal and decreases power consumption. A pre-driving circuit pre-drives a driving circuit of a power amplifying circuit in response to an input signal. The driving circuit drives an output circuit in the power amplifying circuit. A detecting circuit detects the level of the output of the driving circuit. The pre-driving circuit receives the output of the detecting circuit and supplies the pre-driving circuit with a pre-driving current varying in response to the output of the detecting circuit. Consequently, the pre-driving current can be designed to change in response to demand, i.e., the pre-driving current can be low when demand is low and increase as the occasion demands.
    • 公开了功率放大器,其可靠地放大输入信号并降低功耗。 预驱动电路响应于输入信号预驱动功率放大电路的驱动电路。 驱动电路驱动功率放大电路中的输出电路。 检测电路检测驱动电路的输出电平。 预驱动电路接收检测电路的输出,并且向预驱动电路提供响应于检测电路的输出而变化的预驱动电流。 因此,可以设计预驱动电流以响应于需求而改变,即,当需求低时,预驱动电流可以较低,并且根据需要增加。
    • 8. 发明授权
    • Output amplifier
    • 输出放大器
    • US4404528A
    • 1983-09-13
    • US301439
    • 1981-09-11
    • Hiroyasu Yamaguchi
    • Hiroyasu Yamaguchi
    • H03F1/32H03F3/20H03F3/30H03F3/04H03F3/26
    • H03F3/3088H03F1/3217H03F3/3066
    • An output amplifier comprises an output transistor and a biasing transistor whose emitter is connected to the emitter of the output transistor. The polarity of the biasing transistor is the same as that of the output transistor. Resistors of small resistance are connected to the collector and base of the biasing transistor, respectively. The other ends of these resistors are connected to the base of the output transistor. When an input signal in the positive cycle is applied to the base of the output transistor, the circuit comprising the biasing transistor and the resistors operates as a resistance circuit. On the other hand, when no signal is applied to the base of the output transistor, or when a signal in the negative cycle is applied to the base of the output transistor, the circuit operates as a current mirror circuit. Therefore, when the output transistor is cut off, the biasing transistor is simultaneously cut off.
    • 输出放大器包括输出晶体管和偏置晶体管,其发射极连接到输出晶体管的发射极。 偏置晶体管的极性与输出晶体管的极性相同。 小电阻的电阻分别连接到偏置晶体管的集电极和基极。 这些电阻的另一端连接到输出晶体管的基极。 当正周期中的输入信号被施加到输出晶体管的基极时,包括偏置晶体管和电阻的电路用作电阻电路。 另一方面,当没有信号施加到输出晶体管的基极时,或当负周期中的信号施加到输出晶体管的基极时,电路作为电流镜电路工作。 因此,当输出晶体管截止时,偏置晶体管同时截止。
    • 10. 发明授权
    • Automatic level control circuit
    • 自动电平控制电路
    • US4234853A
    • 1980-11-18
    • US923629
    • 1978-07-11
    • Hiroyasu Yamaguchi
    • Hiroyasu Yamaguchi
    • H03G3/30G11B20/04H03G3/20
    • H03G3/3005
    • An automatic level control circuit including a current controlled attenuator wherein the amount of attenuation is controlled by a control current, an amplifier for amplifying an output signal of the attenuator, a current rectifier for forming a DC current source in accordance with the amplitude of the output signal voltage from the amplifier, and a current shunt for absorbing an output current fed from the rectifier. The control current is produced as a difference between the current from the rectifier and the current absorbed by the shunt. When the current fed from the rectifier is larger than that absorbed by the shunt, the automatic level control circuit operates in a manner that, when its input signal is at low level, the circuit gain is large and, as the input signal level rises, the circuit gain drops.
    • 一种自动电平控制电路,包括电流控制衰减器,其中衰减量由控制电流控制,放大器用于放大衰减器的输出信号;电流整流器,用于根据输出的幅度形成DC电流源 来自放大器的信号电压,以及用于吸收从整流器馈送的输出电流的电流分流器。 控制电流被产生为来自整流器的电流与由分流吸收的电流之间的差。 当从整流器馈送的电流大于分路所吸收的电流时,自动电平控制电路以其输入信号为低电平的方式工作时,电路增益较大,并且随着输入信号电平的上升, 电路增益下降。