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    • 8. 发明授权
    • Monostable multivibrator
    • 单稳态多谐振荡器
    • US5410191A
    • 1995-04-25
    • US187819
    • 1994-01-27
    • Katsunori Miura
    • Katsunori Miura
    • G11B20/06H03K3/02H03K3/0232H03K3/284
    • H03K3/0232
    • A monostable multivibrator is formed in a monolithic integrated circuit along with a voltage controlled oscillator (VCO). The VCO and the monostable multivibrator respectively includes capacitors. A center frequency of the VCO is controlled by a control signal from a low-pass filter which receives an output of a phase comparator. A current from a constant current source circuit is adjusted to be in proportion to a level of the control signal. The capacitor of the monostable multivibrator charged by the current is adjusted from the constant current source circuit in response to a trigger pulse. A period from a time when the charge is started to a time when a charged voltage of the capacitor reaches a predetermined value becomes a metastable period of the monostable multivibrator.
    • 单稳态多谐振荡器与压控振荡器(VCO)一起形成在单片集成电路中。 VCO和单稳态多谐振荡器分别包括电容器。 VCO的中心频率由接收相位比较器的输出的低通滤波器的控制信号控制。 来自恒流源电路的电流被调节成与控制信号的电平成比例。 响应于触发脉冲,从恒流源电路调节由电流充电的单稳态多谐振荡器的电容器。 从充电开始到电容器的充电电压达到规定值的时间的期间成为单稳态多谐振荡器的亚稳定期间。
    • 9. 发明授权
    • Active filter circuit
    • 有源滤波电路
    • US5317216A
    • 1994-05-31
    • US515021
    • 1990-04-19
    • Nobukazu HosoyaKatsunori MiuraToru Sasaki
    • Nobukazu HosoyaKatsunori MiuraToru Sasaki
    • H03H11/12H03B1/00H03K5/00
    • H03H11/126H03H11/1213
    • An active filter circuit includes a first and second differential pairs each having a pair of transistors. A capacitor is connected to a collector of one transistor from each of the first and second differential pairs. A first and second negative feed-back paths are connected, respectively, between the collector and a base of one transistor of the first differential pair and between the collector of one transistor of the second differential pair and a base of the other transistor of the first differential pair. By applying suitable voltages to respective inputs of the differential pairs, the active filter circuit functions as a band-pass filter, lowpass filter, high-pass filter, band elimination filter or phase-shifting filter with the same circuit configuration. A current mirror circuit correlatively changes current amounts of the first and second differential pairs in response to a control voltage, whereby a filter characteristic can be changed.
    • 有源滤波器电路包括每个具有一对晶体管的第一和第二差分对。 电容器从第一和第二差分对中的每一个连接到一个晶体管的集电极。 第一和第二负反馈路径分别连接在第一差分对的一个晶体管的集电极和基极之间以及第二差分对的一个晶体管的集电极和第一差分对的另一个晶体管的基极之间 差分对。 通过对差分对的各个输入端施加合适的电压,有源滤波器电路用作具有相同电路结构的带通滤波器,低通滤波器,高通滤波器,带除滤波器或相移滤波器。 电流镜电路响应于控制电压相关地改变第一和第二差分对的电流量,从而可以改变滤波器特性。