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    • 7. 发明授权
    • Differential amplifier circuit
    • 差分放大电路
    • US4769617A
    • 1988-09-06
    • US103815
    • 1987-10-02
    • Yasuo Mizuide
    • Yasuo Mizuide
    • H03F3/45
    • H03F3/45071H03F2203/45251H03F2203/45258H03F2203/45612
    • A differential amplifier circuit includes a pair of differential input signal terminals, first and second current output terminals, a first transistor whose collector is connected to the first current output terminal, a second transistor whose collector is connected to the second current output terminal, a third transistor whose collector and base are respectively connected to the emitter of the first transistor and the emitter of the second transistor, a fourth transistor whose collector and base are respectively connected to the emitter of the second transistor and the emitter of the first transistor, first and second resistors, and a constant current source circuit connected to the emitters of the third and fourth transistors via the first and seond resistors. Furthermore, the differential amplifier circuit includes first and second emitter followers, the input terminals of which are respectively connected to the pair of differential input signal terminals, and the output terminals of which are respectively connected to the bases of the first and second transistors.
    • 差分放大器电路包括一对差分输入信号端子,第一和第二电流输出端子,集电极连接到第一电流输出端子的第一晶体管,其集电极连接到第二电流输出端子的第二晶体管, 晶体管的集电极和基极分别连接到第一晶体管的发射极和第二晶体管的发射极,第四晶体管的集电极和基极分别连接到第二晶体管的发射极和第一晶体管的发射极, 第二电阻器和经由第一和第三电阻器连接到第三和第四晶体管的发射极的恒流源电路。 此外,差分放大电路包括第一和第二发射极跟随器,其输入端分别连接到一对差分输入信号端子,其输出端分别连接到第一和第二晶体管的基极。
    • 9. 发明授权
    • Differential amplifier and active filter using the same
    • 差分放大器和有源滤波器使用相同
    • US5218319A
    • 1993-06-08
    • US886239
    • 1992-05-21
    • Kyuichi Takimoto
    • Kyuichi Takimoto
    • H03H11/04H03F3/45H03H11/12H04M1/725
    • H03F3/4508H03F3/45085H03H11/1217H04M1/725H03F2200/219H03F2203/45022H03F2203/45258H03F2203/45346H03F2203/45392H03F2203/45612H03F2203/45652H03F2203/45674H03F2203/45691
    • A differential amplifier comprises a pair of current mirror circuits, a pair of constant current supplies and a pair of differential amplifier circuits. The first differential amplifier circuit is provided between the first current mirror circuit and the first constant current supply. The second differential amplifier circuit is positioned between the second constant current supply and the second current mirror circuit. The second differential amplifier circuit includes a pair of multicollector pnp transistors each having a first one of its collectors connected to the second current mirror circuit and a second one of its collectors connected to the second power supply. The first differential amplifier circuit performs differential amplification on an externally supplied input signal and an output signal of the second differential amplifier circuit, thereby to produce complementary differential output signals which are supplied as corresponding input signals to the second differential amplifier circuit and which performs differential amplification thereon and produces, as the output signal thereof, the output signal of the differential amplifier. A plurality of the differential amplifiers may be used in an active filter.
    • 差分放大器包括一对电流镜电路,一对恒流源和一对差分放大电路。 第一差分放大器电路设置在第一电流镜电路和第一恒流源之间。 第二差分放大器电路位于第二恒流源和第二电流镜电路之间。 第二差分放大器电路包括一对多反射器pnp晶体管,其每一个具有连接到第二电流镜电路的集电极中的第一个和与第二电源连接的第二个集电极。 第一差分放大器电路对外部提供的输入信号和第二差分放大器电路的输出信号执行差分放大,从而产生作为相应输入信号提供给第二差分放大器电路并且执行差分放大的互补差分输出信号 作为其输出信号,产生差分放大器的输出信号。 多个差分放大器可以用在有源滤波器中。