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    • 7. 发明授权
    • Discrete time lowpass filter
    • 离散时间低通滤波器
    • US09577608B2
    • 2017-02-21
    • US12541834
    • 2009-08-14
    • Russell John FaggJoseph Patrick Burke
    • Russell John FaggJoseph Patrick Burke
    • G06F17/17H03H19/00H03H15/00H03H17/06
    • H03H19/004H03H15/023H03H17/0657H03H17/0664
    • A discrete time (DT) lowpass filter having various advantages is described. In an exemplary design, the DT lowpass filter includes a decimating DT filter (which may include a passive DT FIR filter and/or a passive DT IIR filter) and an active DT filter. The decimating DT filter receives a first DT signal at a first sample rate, filters and decimates the first DT signal by a factor of N, and provides a second DT signal at a second sample rate lower than the first sample rate. N may be greater than one. The active DT filter filters the second DT signal and provides a third DT signal at the second sample rate. A sampler samples a continuous time signal and provides the first DT signal. The sampler may further double the voltage of the first DT signal relative to the voltage of the continuous time signal.
    • 描述了具有各种优点的离散时间(DT)低通滤波器。 在示例性设计中,DT低通滤波器包括抽取DT滤波器(其可以包括无源DT FIR滤波器和/或无源DT IIR滤波器)和有源DT滤波器。 抽取DT滤波器以第一采样速率接收第一DT信号,以N因子对第一DT信号进行滤波和抽取,并以低于第一采样率的第二采样速率提供第二DT信号。 N可能大于1。 有源DT滤波器对第二DT信号进行滤波,并以第二采样率提供第三DT信号。 采样器采样连续时间信号并提供第一个DT信号。 采样器可以相对于连续时间信号的电压进一步使第一DT信号的电压加倍。
    • 8. 发明授权
    • Chopper stabilized amplifier with synchronous switched capacitor noise filtering
    • 具有同步开关电容噪声滤波的斩波稳压放大器
    • US09473074B1
    • 2016-10-18
    • US14852921
    • 2015-09-14
    • IXYS Corporation
    • Eric Blom
    • H03F1/02H03F1/26H03F3/393
    • H03F3/393H03F1/26H03F3/45192H03F3/45475H03F2200/171H03F2200/271H03F2200/411H03F2200/555H03F2203/45514H03H19/004
    • A chopper stabilized amplifier with synchronous switched capacitor noise filtering is disclosed. In an exemplary embodiment, an apparatus includes a chopper amplifier having an input that receives an input signal and an output that outputs an amplified signal. The chopper amplifier includes an input chopping circuit and an output chopping circuit, where the input and output chopping circuits operate in response to a chop clock. The apparatus also includes a switched capacitor filter having an input that receives the amplified signal and an output that outputs a filtered signal. The switched capacitor filter operates in response to a filter clock. The apparatus also includes a filter timing adjuster that receives a reference voltage and adjusts a phase of the filter clock with respect to the chop clock to reduce chopper noise on that reference voltage.
    • 公开了具有同步开关电容噪声滤波的斩波稳定放大器。 在示例性实施例中,一种装置包括具有接收输入信号的输入和输出放大信号的输出的斩波放大器。 斩波放大器包括输入斩波电路和输出斩波电路,其中输入和输出斩波电路响应于斩波时钟而工作。 该装置还包括具有接收放大信号的输入端和输出滤波信号的输出的开关电容滤波器。 开关电容滤波器响应于滤波器时钟而工作。 该装置还包括滤波器定时调节器,其接收参考电压并相对于斩波时钟调节滤波器时钟的相位,以减小该参考电压的斩波噪声。