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    • 4. 发明授权
    • Integrated filter circuit with variable frequency characteristics
    • 具有变频特性的集成滤波电路
    • US4667120A
    • 1987-05-19
    • US721867
    • 1985-04-10
    • Yoshinori OkadaIsao FukushimaKuniaki MiuraKenji Kano
    • Yoshinori OkadaIsao FukushimaKuniaki MiuraKenji Kano
    • H03H7/01H01L27/00H03H7/06H03H11/04H03K5/00H03B1/00
    • H03H11/1291
    • A filter integrated circuit having a reference level generator circuit for attenuating its input signal and generating a reference level signal, a pseudofilter circuit including resistors and a variable capacitor as filter elements, and an error amplifier unit for comparing the level of the output signal of the reference level generator circuit with the level of the output signal of the pseudofilter circuit and for generating an automatic adjustment control signal in accordance with the level difference between the output signals. The automatic adjustment control signal is supplied to the pseudofilter circuit to change the capacitance value of the variable capacitor in the pseudofilter circuit so that the output signal level of the pseudofilter circuit may become equal to the level of the reference signal. The automatic adjustment control signal is also supplied to at least one filter circuit to change the capacitance of a variable capacitor included therein. As a result, the deviation in the filter characteristics caused by deviations in the resistance of a resistor and in the capacitance of the capacitor is corrected.
    • 一种滤波器集成电路,具有用于衰减其输入信号并产生参考电平信号的参考电平发生器电路,包括电阻器的可变电容器和作为滤波器元件的可变电容器的误滤电路,以及误差放大器单元,用于将输出信号的输出信号 参考电平发生器电路,其具有伪滤波电路的输出信号的电平,并且用于根据输出信号之间的电平差产生自动调节控制信号。 自动调节控制信号被提供给伪滤光器电路,以改变伪滤光器电路中的可变电容器的电容值,使得可将假模糊电路的输出信号电平变为等于参考信号的电平。 自动调整控制信号也被提供给至少一个滤波器电路以改变其中包括的可变电容器的电容。 结果,校正了由电阻器的电阻的偏差和电容器的电容引起的滤波器特性的偏差。
    • 8. 发明授权
    • Constant-voltage circuit insensitive to source change
    • 恒压电路对源变化不敏感
    • US4560919A
    • 1985-12-24
    • US644434
    • 1984-08-27
    • Hitoshi IshikawaKenji Kano
    • Hitoshi IshikawaKenji Kano
    • H03F1/30G05F3/18G05F3/26
    • G05F3/18
    • A constant-voltage circuit includes a transistor (Q3) for output control connected between a source potential and a ground potential and a divider circuit (R1, R2, D2, D3) which are connected in series. The dividing point of the divider circuit connected between the emitter of the transistor (Q3) and the ground potential serves as an output terminal to be supplied with a predetermined voltage by the emitter of the transistor (Q3), so that a constant voltage appears at the output terminal. Connection between the base and the collector of the transistor (Q3) is so improved that the emitter voltage is not changed following a change in the source voltage. More specifically, the transistor (Q3) is connected in such a manner that the collector-to-emitter voltage is continuously clamped by the base-to-emitter voltage of the transistor (Q3), so that the transistor (Q3) is not subjected to a base width modulation effect and thus the emitter potential is not changed following the change in the source voltage.
    • 恒压电路包括用于在源电位和地电位之间连接的输出控制的晶体管(Q3)和串联连接的分压电路(R1,R2,D2,D3)。 连接在晶体管(Q3)的发射极和地电位之间的分压电路的分割点用作由晶体管(Q3)的发射极供给预定电压的输出端子,使得恒定电压出现在 输出端子。 晶体管(Q3)的基极和集电极之间的连接被改善,使得发射极电压在源极电压变化之后不改变。 更具体地,晶体管(Q3)以这样的方式连接,使得集电极到发射极的电压被晶体管(Q3)的基极 - 发射极电压连续钳位,使得晶体管(Q3)不受 到基极宽度调制效应,因此在源极电压变化之后发射极电位不变。