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发明授权
US07002404B2 Tuning circuit for a filter 有权
滤波器调谐电路

Tuning circuit for a filter
摘要：
The invention relates to a tuning circuit for tuning a filter stage, which has an RC element (1) with an RC time constant (τ), with the RC time constant (τ) being the product of the resistance of a resistor (R1) in the RC element (1) and the capacitance of a capacitor (C1), which is connected in series with the resistor (R1), in the RC element (1), having a comparator (10) for comparison of the voltage which is produced at the potential node (4) between the resistor (R1) and the capacitor (C1), with a reference ground voltage; and having a controller (15) which varies the charge on the capacitor (C1) in the RC element (1) until the comparator (10) indicates that the voltage which is produced at the potential node (4) is equal to the reference ground voltage, with the controller (15) switching a capacitor array (26) as a function of the charge variation time, which capacitor array (26) is connected in parallel with the capacitor (C1) in the RC element (1), in order to compensate for any discrepancy between the RC time constant (τ) of the RC element (1) and a nominal value.
摘要（中）：

本发明涉及一种用于调谐滤波器级的调谐电路，其具有RC时间常数（τ）的RC元件（1），其中RC时间常数（τ）是电阻器（R 1 ）和RC元件（1）中与电阻器（R 1）串联连接的电容器（C1）的电容，具有比较器（10），用于比较 在电阻器（R 1）和电容器（C 1）之间的电位节点（4）产生的具有参考接地电压的电压; 并且具有改变RC元件（1）中的电容器（C1）上的电荷的控制器（15），直到比较器（10）指示在电势节点（4）处产生的电压等于参考 接地电压，控制器（15）根据电荷变化时间切换电容器阵列（26），电容器阵列（26）与RC元件（1）中的电容器（C 1）并联连接， 以便补偿RC元件（1）的RC时间常数（τ）与标称值之间的任何差异。

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