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    • 3. 发明授权
    • Amplifying device
    • 放大装置
    • US06268771B1
    • 2001-07-31
    • US09523650
    • 2000-03-10
    • Katsumi Miyazaki
    • Katsumi Miyazaki
    • H03F326
    • H03F1/3217H03F3/3027
    • A MOSFET (1) performing a current source operation and a MOSFET (2) performing a current sink operation are both of n-channel type. An input voltage (Vin) to be inputted to a gate electrode of the MOSFET (2) is divided by two resistance elements (6 and 7) and then inputted to the gate electrode of the MOSFET (2). A transistor (4) is disposed between a drain electrode of a MOSFET (3) and a gate electrode of the MOSFET (1). A constant current (Ib1) supplied by a constant current source (8) separately flows into the transistor (4) and a resistance element (5). A constant reference voltage(Va) is inputted to a base electrode of the transistor (4), which is low enough to operate the MOSFET (3) within a triode region. This configuration achieves both larger dynamic range and easier control of idling current.
    • 执行电流源操作的MOSFET(1)和执行电流吸收器操作的MOSFET(2)都是n沟道型。 要输入到MOSFET(2)的栅电极的输入电压(Vin)被两个电阻元件(6和7)分压,然后被输入到MOSFET(2)的栅电极。 晶体管(4)设置在MOSFET(3)的漏电极和MOSFET(1)的栅电极之间。 由恒流源(8)提供的恒定电流(Ib1)分别流入晶体管(4)和电阻元件(5)。 将恒定的参考电压(Va)输入到晶体管(4)的基极,其足够低以在三极管区域内操作MOSFET(3)。 这种配置实现了更大的动态范围和更容易控制怠速电流。
    • 6. 发明授权
    • Spike current reducing circuit
    • 尖峰电流降低电路
    • US06636087B2
    • 2003-10-21
    • US10160238
    • 2002-06-04
    • Katsumi Miyazaki
    • Katsumi Miyazaki
    • H03B100
    • H03K17/166
    • Charge accumulated at an output node of an output transistor is discharged to the ground through the output transistor as a spike current. To reduce noise of the spike current, a control signal is sent from an output transistor driving circuit set to a low impedance to the output transistor in a first driving stage to quickly turn on the output transistor, a control signal is sent from the output transistor driving circuit set to a high impedance to the output transistor in a second driving stage to output the spike current through the output transistor at a fixed rate, and a control signal is sent from the output transistor driving circuit set to a low impedance to the output transistor in a third driving stage to quickly discharge all the charge. Therefore, a time-current characteristic of the spike current is set almost in a trapezoid shape, and both a spike current peak value and a spike current occurrence time period in the spike current can be sufficiently lowered.
    • 在输出晶体管的输出节点处累积的电荷通过输出晶体管作为尖峰电流被放电到地。 为了降低尖峰电流的噪声,在第一驱动级中将控制信号从设置为低阻抗的输出晶体管驱动电路发送到输出晶体管,以快速导通输出晶体管,从输出晶体管发送控制信号 驱动电路在第二驱动级中设置为输出晶体管的高阻抗,以固定速率输出尖峰电流通过输出晶体管,并且控制信号从设置为低阻抗的输出晶体管驱动电路发送到输出 晶体管在第三驱动阶段快速放电所有的电荷。 因此,尖峰电流的时间电流特性几乎为梯形,并且可以充分降低尖峰电流中的尖峰电流峰值和尖峰电流发生时间周期。