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    • 1. 发明申请
    • Line driver with active termination
    • 线路驱动器,主动终端
    • US20080101592A1
    • 2008-05-01
    • US11590202
    • 2006-10-30
    • Jiangfeng WuTianwei LiArnoldus Venes
    • Jiangfeng WuTianwei LiArnoldus Venes
    • H04M1/00H04M9/00
    • H04M11/062H04L25/028H04L25/0298
    • A line driver comprises a driving amplifier receiving an input of the line driver, a current sense resistor connected between the driving amplifier output and the line driver output, and a feedback amplifier sensing the voltage across the current sense resistor and providing a corresponding feedback voltage that is proportional to the output current to the driving amplifier, thereby determining an output impedance at the line driver output. Precise output impedance can be realized by using a high precision resistor as the current sense resistor, and using resistive feedback amplifiers with accurate gains as the driving and feedback amplifiers. The resistance of the current sense resistor can be substantially less than the line driver output impedance, and the driving amplifier output voltage swing can be substantially less than twice the line driver output voltage swing.
    • 线路驱动器包括接收线路驱动器的输入的驱动放大器,连接在驱动放大器输出和线路驱动器输出之间的电流检测电阻器,以及感测电流检测电阻器两端的电压的反馈放大器,并提供相应的反馈电压, 与驱动放大器的输出电流成比例,从而确定线路驱动器输出端的输出阻抗。 可以通过使用高精度电阻器作为电流检测电阻器,并使用具有精确增益的电阻反馈放大器作为驱动和反馈放大器来实现精确的输出阻抗。 电流检测电阻器的电阻可以显着小于线路驱动器输出阻抗,并且驱动放大器输出电压摆幅可以显着小于线路驱动器输出电压摆幅的两倍。
    • 2. 发明授权
    • Line driver with active termination
    • 线路驱动器,主动终端
    • US08009824B2
    • 2011-08-30
    • US11590202
    • 2006-10-30
    • Jiangfeng WuTianwei LiArnoldus Venes
    • Jiangfeng WuTianwei LiArnoldus Venes
    • H04M1/00
    • H04M11/062H04L25/028H04L25/0298
    • A line driver comprises a driving amplifier receiving an input of the line driver, a current sense resistor connected between the driving amplifier output and the line driver output, and a feedback amplifier sensing the voltage across the current sense resistor and providing a corresponding feedback voltage that is proportional to the output current to the driving amplifier, thereby determining an output impedance at the line driver output. Precise output impedance can be realized by using a high precision resistor as the current sense resistor, and using resistive feedback amplifiers with accurate gains as the driving and feedback amplifiers. The resistance of the current sense resistor can be substantially less than the line driver output impedance, and the driving amplifier output voltage swing can be substantially less than twice the line driver output voltage swing.
    • 线路驱动器包括接收线路驱动器的输入的驱动放大器,连接在驱动放大器输出和线路驱动器输出之间的电流检测电阻器,以及感测电流检测电阻器两端的电压的反馈放大器,并提供相应的反馈电压, 与驱动放大器的输出电流成比例,从而确定线路驱动器输出端的输出阻抗。 可以通过使用高精度电阻器作为电流检测电阻器,并使用具有精确增益的电阻反馈放大器作为驱动和反馈放大器来实现精确的输出阻抗。 电流检测电阻器的电阻可以显着小于线路驱动器输出阻抗,并且驱动放大器输出电压摆幅可以显着小于线路驱动器输出电压摆幅的两倍。
    • 7. 发明授权
    • Digital-to-analog converter with programmable current control
    • 具有可编程电流控制的数模转换器
    • US07129871B1
    • 2006-10-31
    • US11214798
    • 2005-08-31
    • Arnoldus VenesYonghua Cong
    • Arnoldus VenesYonghua Cong
    • H03M1/00
    • H03M1/1061H03F3/45089H03F3/45188H03F3/72H03F2203/45641H03M1/742
    • A wide gain range current digital-to-analog converter (DAC) is presented that includes a unit current cell having a current source module biased by a current source voltage bias, a differential switch module, a main cascode module biased by a first bias voltage and an attenuation cascode module biased by a second bias voltage, configured such that a particular current gain range is obtained at the main cascode module output when a unit current cell current is at or above a current threshold. The output current at the attenuation cascode module output can be input into a current attenuator when the unit current cell current is below the current threshold to obtain additional current gain range. The current attenuator can include a plurality of attenuator cells that can be programmed to a desired level of current gain in linear decibels or linear step intervals. Smaller step sizes can be obtained by programming a current source within the step intervals.
    • 提出了一种宽增益范围的当前数模转换器(DAC),其包括具有由电流源电压偏置偏置的电流源模块的单位电流单元,差分开关模块,被第一偏置电压 以及由第二偏置电压偏置的衰减级联模块模块,其被配置为使得当单位电流单元电流处于或高于当前阈值时,在主级联模块输出处获得特定的电流增益范围。 当单位电流单元电流低于电流阈值时,衰减级联模块输出端的输出电流可以输入到电流衰减器,以获得额外的电流增益范围。 电流衰减器可以包括多个衰减器单元,其可以以线性分贝或线性步进间隔被编程到期望的电流增益水平。 可以通过在步进间隔内编程电流源来获得较小的步长。