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    • 5. 发明授权
    • Systems and methods for translation of signal levels across voltage domains
    • 跨电压域的信号电平转换的系统和方法
    • US07205820B1
    • 2007-04-17
    • US11177853
    • 2005-07-08
    • Sally YeungWilliam Michael Lye
    • Sally YeungWilliam Michael Lye
    • H03L5/00
    • H03K3/356165
    • A level shifting circuit with a power monitor enable for mixed-voltage applications is described. The level shifter translates signals from a first power supply voltage domain to a second. The level shifter provides a known output state, rather than an undefined mid-rail state, when either of the power supplies for the voltage domains is not adequately powered. In addition, the level shifter is IDDQ (quiescent current) compliant when static, drawing negligible current from the power supply. The level shifter can be used with a power monitor circuit, which controls the level shifter during power-up with an enable signal.
    • 描述了具有用于混合电压应用的功率监视器的电平移位电路。 电平移位器将信号从第一电源电压域转换为第二电源。 当电压域的任一电源没有充分供电时,电平转换器提供已知的输出状态,而不是未定义的中间轨道状态。 此外,电平移位器在静态时符合IDDQ(静态电流),从电源中可以忽略电流。 电平转换器可以与功率监控电路一起使用,电源监视器电路在通电使能信号时控制电平移位器。
    • 6. 发明授权
    • Method and apparatus for adjusting bias and amplitude of a video signal
    • 调整视频信号的偏置和幅度的方法和装置
    • US06750920B1
    • 2004-06-15
    • US09268475
    • 1999-03-16
    • Sally YeungHugh Chow
    • Sally YeungHugh Chow
    • H04N520
    • H04N5/52H04N5/165
    • A method and apparatus for adjusting the amplitude and DC bias of a video signal is presented, which may be performed in preparation for analog-to-digital conversion. This is accomplished by first converting a received voltage mode video signal to a current mode video signal. Similarly, a voltage mode bias control signal is converted to a current mode bias control signal. The amplitude of the current mode video signal is then adjusted to produce an amplitude adjusted video signal. Similarly, the amplitude of the current mode bias signal is adjusted to produce an amplitude adjusted bias control signal. The current mode amplitude adjusted signals are then combined to produce a biased adjusted current mode video signal. The biased adjusted current mode video signal is then converted back to a voltage mode signal, which may be provided to an analog-to-digital converter for conversion.
    • 提出了一种用于调整视频信号的幅度和DC偏置的方法和装置,其可以在为模数转换做准备时执行。 这通过首先将接收的电压模式视频信号转换为当前模式视频信号来实现。 类似地,电压模式偏置控制信号被转换成电流模式偏置控制信号。 然后调整电流模式视频信号的幅度以产生调幅视频信号。 类似地,电流模式偏置信号的幅度被调节以产生调幅偏移控制信号。 然后将电流模式幅度调整信号组合以产生偏置的调整后的电流模式视频信号。 偏置的调整后的电流模式视频信号然后被转换回电压模式信号,其可以提供给模数转换器进行转换。