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Glitchless switched-capacitor biquad low pass filter

机译:无干扰开关电容器双二阶低通滤波器

摘要

A fully differential switched-capacitor biquad low pass filter (40) includes a first stage (54), second stage (56), common-mode circuits (55, 72), and feedback transmission gates (73, 74). The first stage (54) includes a first operational amplifier (47), and the second stage (56) includes a second operational amplifier (69). Glitches, or transients, which are caused by the operational amplifiers (47, 69) operating in slew rate limit mode, are prevented from affecting the differential output signals of the filter (40) when the filter (40) is operating with a continuous time output. This is accomplished by preventing the operational amplifiers (47, 69) from operating in slew rate limit mode, or by adjusting the clock signals such that the output of the filter (40) is not coupled to an operational amplifier (47, 69) that is recovering from operation in slew rate limit mode.
机译:全差分开关电容器双二阶低通滤波器(40)包括第一级(54),第二级(56),共模电路(55、72)和反馈传输门(73、74)。第一级(54)包括第一运算放大器(47),第二级(56)包括第二运算放大器(69)。当滤波器(40)连续工作时,可以防止由以摆率限制模式工作的运算放大器(47、69)引起的毛刺或瞬变影响滤波器(40)的差分输出信号。输出。这是通过防止运算放大器(47、69)以转换速率限制模式工作或通过调整时钟信号以使滤波器(40)的输出不耦合至运算放大器(47、69)来实现的。正在以摆率限制模式运行中恢复。

著录项

  • 公开/公告号US5391999A

    专利类型

  • 公开/公告日1995-02-21

    原文格式PDF

  • 申请/专利权人 MOTOROLA INC.;

    申请/专利号US19930160136

  • 发明设计人 JEFFREY D. GANGER;ADRIAN B. EARLY;

    申请日1993-12-02

  • 分类号H03K5/00;

  • 国家 US

  • 入库时间 2022-08-22 04:05:24

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