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    • 61. 发明授权
    • Single stage operational amplifier voltage reference
    • 单级运算放大器电压参考
    • US4438388A
    • 1984-03-20
    • US329838
    • 1981-12-11
    • Robert D. Lee
    • Robert D. Lee
    • G05F3/24H03K19/003G05F3/20
    • H03K19/00384G05F3/242
    • A single stage operational amplifier voltage reference circuit for providing a precise reference voltage to bias multiple transistor-transistor logic (TTL) interface circuits is described. The voltage reference utilizes a current mirror having ratioed transistors to source or sink whatever current is necessary to maintain the reference voltage. The reference voltage is made substantially insensitive to process variations by ratioing transistor device sizes in a current source portion to transistor device sizes in an output load voltage divider portion. A capacitor is utilized to reduce transient errors at the output.
    • 描述了用于提供精确参考电压以偏置多个晶体管晶体管逻辑(TTL)接口电路的单级运算放大器电压参考电路。 电压参考使用具有比例晶体管的电流镜来源或吸收维持参考电压所需的任何电流。 通过将电流源部分中的晶体管器件尺寸与输出负载分压器部分中的晶体管器件尺寸进行比例,使得参考电压对工艺变化基本上不敏感。 使用电容器来减少输出端的瞬态误差。
    • 62. 发明授权
    • Biomedical ultrasonoscope
    • 生物医学超声检查
    • US4156304A
    • 1979-05-29
    • US728369
    • 1976-09-30
    • Robert D. Lee
    • Robert D. Lee
    • A61B8/00G01S7/52A61B5/00
    • G01S7/5206A61B8/00G01N29/0645
    • The combination of a "C" mode scan electronics in a portable, battery powered biomedical ultrasonoscope having "A" and "M" mode scan electronics, the latter including a clock generator for generating clock pulses, a cathode ray tube having X, Y and Z axis inputs, a sweep generator connected between the clock generator and the X axis input of the cathode ray tube for generating a cathode ray sweep signal synchronized by the clock pulses, and a receiver adapted to be connected to the Z axis input of the cathode ray tube. The "C" mode scan electronics comprises a plurality of transducer elements arranged in a row and adapted to be positioned on the skin of the patient's body for converting a pulsed electrical signal to a pulsed ultrasonic signal, radiating the ultrasonic signal into the patient's body, picking up the echoes reflected from interfaces in the patient's body and converting the echoes to electrical signals; a plurality of transmitters, each transmitter being coupled to a respective transducer for transmitting a pulsed electrical signal thereto and for transmitting the converted electrical echo signals directly to the receiver, a sequencer connected between the clock generator and the plurality of transmitters and responsive to the clock pulses for firing the transmitters in cyclic order; and a staircase voltage generator connected between the clock generator and the Y axis input of the cathode ray tube for generating a staircase voltage having steps synchronized by the clock pulses.
    • 具有“A”和“M”型扫描电子装置的便携式,电池供电的生物医学超声检查仪中的“C”型扫描电子器件的组合,后者包括用于产生时钟脉冲的时钟发生器,具有X,Y的阴极射线管和 Z轴输入,连接在时钟发生器和阴极射线管的X轴输入端之间的扫描发生器,用于产生由时钟脉冲同步的阴极射线扫描信号,以及适于连接到阴极的Z轴输入的接收器 射线管。 “C”模式扫描电子器件包括多个排列成行的换能器元件,并适于定位在患者身体的皮肤上,用于将脉冲电信号转换为脉冲超声波信号,将超声波信号辐射到患者体内, 拾取从患者体内的界面反射的回波并将回波转换为电信号; 多个发射机,每个发射机被耦合到相应的换能器,用于向其发射脉冲电信号,并将转换后的电回波信号直接发射到接收机,连接在时钟发生器和多个发射机之间并响应时钟的定序器 用于按循环次序发射发射机的脉冲; 连接在时钟发生器和阴极射线管的Y轴输入端之间的阶梯电压发生器,用于产生具有由时钟脉冲同步的台阶的阶梯电压。