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VARIABLE RESISTOR CAPABLE OF CHANGING RESISTANCE VALUE IN EQUAL RATIO, A VARIABLE GAIN AMPLIFIER USING THE SAME, AND A VARIABLE CUTOFF FREQUENCY FILTER
VARIABLE RESISTOR CAPABLE OF CHANGING RESISTANCE VALUE IN EQUAL RATIO, A VARIABLE GAIN AMPLIFIER USING THE SAME, AND A VARIABLE CUTOFF FREQUENCY FILTER
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机译:可变电阻的电阻值可以在等比中变化,可变增益放大器使用相同的电阻,并且可变截止频率滤波器
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摘要
PURPOSE: A variable resistor capable of changing resistance value in equal ratio, a variable gain amplifier using the same, and a variable cutoff frequency filter are provided to reduce the whole circuit area by removing a complex logic circuit.;CONSTITUTION: A first resistance segment(210) and second resistance segments(211,212,213) are serially connected. The first switches(221,222,223) are connected to the second resistance segment in parallel. The second switches(231,232,233) are serially connected to the second resistance segment. The variable resistor(200) is controlled with the control signal of 2 bits. The first switch changes one connection state among second resistor segments according to control signals. The second switch is serially connected to the second resistance segment.;COPYRIGHT KIPO 2012
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