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2. 发明授权

US5650950A Apparatus and method for accurately establishing a cut-off frequency in an electronic filter 失效
标题翻译：在电子滤波器中精确建立截止频率的装置和方法
公开(公告)号：US5650950A
公开(公告)日：1997-07-22
申请号：US455867
申请日：1995-05-31
申请人： Patrick P. Siniscalchi , William R. Krenik , Michael D. Aragon
发明人： Patrick P. Siniscalchi , William R. Krenik , Michael D. Aragon
IPC分类号： H03H17/02 , G06J1/00
CPC分类号： H03H17/0294
摘要： A programmable, electronic filter (10) includes a memory device such as a Read Only Memory ROM (22) for storing specific cut-off frequency adjustment data corresponding to various cut-off frequencies. The ROM (22) receives a ROM address (28) corresponding to a cut-off frequency signal (26). The ROM (22) generates a specific cut-off frequency adjustment value (30) for a digital-to-analog convertor (20) to produce an output reference current (34). A reference voltage (40), an error amplifier (14), a master transconductance element (16), and a capacitor (18) serve as a tuning loop and ultimately produce a control signal (38) in response to the output reference current (34). Control signal (38) serves as an input to slave filter (12) along with the cut-off frequency signal (26). The slave filter (12) may then serve as an electronic filter having the desired frequency-response characteristic. The slave filter (12) may then receive a slave filter input signal (44) and provide a filtered output signal (46) having an accurate frequency-response characteristic at the desired cut-off frequency.
摘要翻译：可编程电子滤波器（10）包括诸如只读存储器ROM（22）的存储器件，用于存储对应于各种截止频率的特定截止频率调节数据。 ROM（22）接收对应于截止频率信号（26）的ROM地址（28）。 ROM（22）产生用于数模转换器（20）的特定截止频率调整值（30）以产生输出参考电流（34）。参考电压（40），误差放大器（14），主跨导元件（16）和电容器（18）用作调谐回路，并且响应于输出参考电流（38）最终产生控制信号（38） 34）。控制信号（38）与截止频率信号（26）一起用作从滤波器（12）的输入。然后，从滤波器（12）可以用作具有期望的频率响应特性的电子滤波器。然后，从滤波器（12）可接收从滤波器输入信号（44），并提供具有所需截止频率的精确频率响应特性的滤波输出信号（46）。

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