Patent ID: 6825712
Filing Date: 2004-11-30
Classification: H03H

Abstract:
A filter circuit comprising:an amplifier block including a plurality of amplifiers; a capacitor block including a plurality of capacitors, the plurality of capacitors being connected to the plurality of amplifiers included in the amplifier block respectively; a plurality of resistor blocks each block including a plurality of resistors; and a resistor block-switching circuit for selecting one of the plurality of resistor blocks and connecting the plurality of resistors included in the selected resistor block to the plurality of amplifiers included in the amplifier block, wherein: a first resistor block of the plurality of resistor blocks has a plurality of resistors, the number of which is different from the number of resistors included in a second resistor block of the plurality of resistor blocks; a first filter circuit in which the first resistor block is connected to the amplifier block constitutes a filter circuit having a first ordinal number; and a second filter circuit in which the second resistor block is connected to the amplifier block constitutes a filter circuit having a second ordinal number.