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    • 6. 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。