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    • 1. 发明授权
    • Tuning circuitry and method for active filters
    • 有源滤波器的调谐电路和方法
    • US08836416B2
    • 2014-09-16
    • US13755207
    • 2013-01-31
    • Jianxun FanRobert C. Glenn
    • Jianxun FanRobert C. Glenn
    • H03K5/00
    • H03K5/00H03K5/2481H03K5/249
    • Embodiments of the present invention may include a filter with programmable components, a tuning signal generator, a comparator, and a feedback system. The tuning signal generator may input first and second test signals into the filter and the comparator may sample the output of the filter in response to each respective signal. The comparator may then compare the sampled outputs to predetermined values. In response to the comparator's output, the feedback system may vary the programmable components of the filter until the search of the programmable components is exhausted, yielding first and second tuning results. Finally, the feedback system may determine a final tuning result based on the first and second tuning results. Consequently, the filter's actual corner frequency may be within an acceptable range of a desired corner frequency.
    • 本发明的实施例可以包括具有可编程组件的滤波器,调谐信号发生器,比较器和反馈系统。 调谐信号发生器可以将第一和第二测试信号输入到滤波器中,并且比较器可以响应每个相应的信号对滤波器的输出进行采样。 然后,比较器可以将采样输出与预定值进行比较。 响应于比较器的输出,反馈系统可以改变滤波器的可编程组件,直到可编程组件的搜索耗尽,产生第一和第二调谐结果。 最后,反馈系统可以基于第一和第二调谐结果确定最终调谐结果。 因此,滤波器的实际转角频率可以在期望转角频率的可接受范围内。