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    • 5. 发明授权
    • Low voltage class B amplifier with low value decoupling capacitors
    • 具有低值去耦电容器的低电压B类放大器
    • US4719430A
    • 1988-01-12
    • US878467
    • 1986-06-25
    • William A. Cole
    • William A. Cole
    • H03F1/02H03F3/26H04R25/00H03F3/45
    • H03F3/26H03F1/0261H03F3/265H04R25/00
    • A class B push-pull integrated circuit suitable for low voltage operation, having two symmetrical halves. Each half circuit has first and second opposite conductivity type transistors having their collectors connected together to the base of a class B driver transistor, the collector of which drives the base of an output transistor. An AC input signal is divided into in-phase and anti-phase components one of which is applied to the base of each first transistor. An AC feedback loop extends from the collector of the fourth transistor through a voltage divider and level shifter to the base of the second transistor. A DC feedback loop extends from the base of the fourth transistor through a fifth transistor to the base of the second transistor. Decoupling capacitors extend from the bases of the fifth transistors and through a diode to ground. The arrangement allows use of small decoupling capacitors, and a current forced through the diode eliminates turn-on delay.
    • B类推挽式集成电路适用于低电压工作,具有两个对称的两半。 每个半电路具有第一和第二相反的导电型晶体管,它们的集电极连接在B类驱动晶体管的基极上,其集电极驱动输出晶体管的基极。 AC输入信号被分为同相和反相分量,其中一个分量施加到每个第一晶体管的基极。 AC反馈回路从第四晶体管的集电极通过分压器和电平移位器延伸到第二晶体管的基极。 DC反馈回路从第四晶体管的基极延伸到第五晶体管到第二晶体管的基极。 去耦电容器从第五晶体管的基极延伸到二极管接地。 该布置允许使用小的去耦电容器,并且强制通过二极管的电流消除导通延迟。
    • 6. 发明授权
    • Peak amplitude detector
    • 峰值检测器
    • US4506169A
    • 1985-03-19
    • US351567
    • 1982-02-23
    • William A. Cole
    • William A. Cole
    • G01R19/04H03G3/20H04R25/00H03K5/22H03K5/153H03K17/00
    • H03G3/3005G01R19/04H04R25/00
    • An electronic device for generating a signal indicative of the peak magnitude of an alternating voltage signal is described. The device includes a voltage-to-current converter that generates a current signal comprising a quiescent current and an alternating current signal which varies directly with the alternating voltage signal. A current sink absorbs the current signal up to a controllable maximum current level. A charge current is generated when the current signal exceeds the maximum current level, and is delivered to a capacitor. Feedback circuitry varies the maximum current level of the current sink directly with the resulting capacitor voltage. The capacitor voltage is consequently indicative of the peak magnitude of the alternating voltage signal. A discharge current is applied to the capacitor so that the capacitor voltage can decrease in response to a decrease in the peak magnitude of the alternating voltage signal.
    • 描述用于产生指示交流电压信号的峰值幅度的信号的电子设备。 该装置包括电压 - 电流转换器,其产生包括静态电流的电流信号和直接与交流电压信号变化的交流信号。 电流吸收器吸收电流信号直到可控的最大电流电平。 当电流信号超过最大电流电平时产生充电电流,并将其传送到电容器。 反馈电路直接与所产生的电容电压改变电流吸收器的最大电流水平。 因此,电容器电压表示交流电压信号的峰值幅度。 放电电流被施加到电容器,使得电容器电压可以响应于交流电压信号的峰值幅度的减小而减小。
    • 8. 发明授权
    • Buffer circuit suitable for low voltage operation
    • 缓冲电路适用于低电压工作
    • US4633166A
    • 1986-12-30
    • US785139
    • 1985-10-07
    • William A. Cole
    • William A. Cole
    • H03F3/34H03F3/50H04R25/00G05F3/16
    • H03F3/50H04R25/00
    • An integrated circuit unity gain buffer amplifier suitable for low voltage operation, in which the input signal is applied to the base of a common emitter NPN transistor first stage. The collector of the first stage is connected to the base of an emitter follower NPN transistor second stage. The emitter of the second stage is connected to the base of an emitter follower PNP transistor third stage. The collector of the first stage is loaded by a constant current source and its emitter is connected through a resistance to ground. The collector and emitter of the second and third stages respectively are connected together through a resistor to the supply voltage. The emitter of the second stage is connected through a resistance to ground. The collector of the third stage is connected both to the output terminal and to the emitter of the first stage. This allows the circuit to operate at a very low supply voltage without any transistor operating in practical saturation.
    • 适用于低电压工作的集成电路单位增益缓冲放大器,其中输入信号施加到公共发射极NPN晶体管第一级的基极。 第一级的集电极连接到射极跟随器NPN晶体管第二级的基极。 第二级的发射极连接到射极跟随器PNP晶体管第三级的基极。 第一级的集电极由恒流源加载,其发射极通过电阻接地连接。 第二级和第三级的集电极和发射极分别通过电阻器连接到电源电压。 第二级的发射极通过电阻接地连接。 第三级的集电极连接到第一级的输出端子和发射极。 这允许电路在非常低的电源电压下工作,而没有任何晶体管工作在实际饱和状态。