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1. 发明申请

WO1996002975A1 LOOP FILTER WITH A VARIABLE RESPONSE TIME 审中-公开
标题翻译：具有可变响应时间的循环过滤器
公开(公告)号：WO1996002975A1
公开(公告)日：1996-02-01
申请号：PCT/US1995008994
申请日：1995-07-17
申请人： MATSUSHITA COMMUNICATION INDUSTRIAL CORPORATION OF AMERICA
发明人： MATSUSHITA COMMUNICATION INDUSTRIAL CORPORATION OF AMERICA , GRUNWELL, Randall, L.
IPC分类号： H03H11/04
CPC分类号： H03H11/0416 , H03H11/48 , H03H11/481
摘要： A tunable filter (25) is described for use in loop control circuits. The filter (25) has a time constant which is determined by a resistor (40) and a capacitor. The capacitor is simulated by the series combination of an impedance converter (41) and a variable resistor, such as a field effect transistor (42). The resistance of the transistor (42) is determined by a control signal present on a control line (32) and the impedance converter (41) converts the resistance into an equivalent capacitive reactance. Therefore, the control signal on the control line (32) effectively controls the capacitance present at a node (43) and, in conjuction with the resistor (40), determines the time constant, and therefore the response time and bandwidth, of the filter (25). Multiple-pole, lowpass, bandpass, highpass, and bandstop filters can be constructed. The impedance converter (41) uses a very small capacitor to simulate a large capacitance value at the node (43). This small capacitance value also allows the filter (25) to be fabricated as part of an integrated circuit.
摘要翻译：描述了可调谐滤波器（25）用于环路控制电路。滤波器（25）具有由电阻器（40）和电容器确定的时间常数。电容器由阻抗转换器（41）和诸如场效应晶体管（42）的可变电阻器的串联组合来模拟。晶体管（42）的电阻由存在于控制线（32）上的控制信号决定，阻抗转换器（41）将电阻转换成等效的容抗。因此，控制线（32）上的控制信号有效地控制存在于节点（43）处的电容，并且与电阻器（40）结合确定滤波器的时间常数，因此确定滤波器的响应时间和带宽（25）。可以构建多极，低通，带通，高通和带阻滤波器。阻抗转换器（41）使用非常小的电容器来模拟节点处的大的电容值（43）。该小电容值也允许将滤波器（25）制造为集成电路的一部分。

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