Differential filter circuit and integrated circuit structure therefor
First Claim
1. A first-order differential low pass filter circuit comprising:
- a first resistor exclusively connected between a first input terminal and a first output terminal;
a second resistor having the same resistance value as said first resistor and exclusively connected between a second input terminal and a second output terminal;
a first capacitor connected between said first output terminal and a reference potential;
a second capacitor having the same capacitance value as said first capacitor and connected between said second output terminal and said reference potential; and
a third capacitor connected between said first output terminal and said second output terminal.
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Accused Products
Abstract
Differential filters for removing both normal-mode and common-mode noises are provided. A first-order differential low pass filter is composed of a first resistor connected between a first input terminal and a first output terminal, a second resistor having the same resistance value as the first resistor and connected between a second input terminal and a second output terminal, a first capacitor connected between the first output terminal and a reference potential, a second capacitor having the same capacitance value as the first capacitor and connected between the second output terminal and the reference potential, and a third capacitor connected between the first output terminal and the second output terminal.
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Citations
18 Claims
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1. A first-order differential low pass filter circuit comprising:
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a first resistor exclusively connected between a first input terminal and a first output terminal; a second resistor having the same resistance value as said first resistor and exclusively connected between a second input terminal and a second output terminal; a first capacitor connected between said first output terminal and a reference potential; a second capacitor having the same capacitance value as said first capacitor and connected between said second output terminal and said reference potential; and a third capacitor connected between said first output terminal and said second output terminal.
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2. An integrated circuit structure comprising:
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a first insulating layer; a first electrode formed to be in contact with a first surface of said first insulating layer; a second electrode and a third electrode formed on an opposite second surface of said first insulating layer at positions opposite to said first electrode; a fourth electrode and a fifth electrode formed at positions opposite to said second electrode and said third electrode, respectively, through a second insulating layer; a first resistor and a second resistor formed on the second surface of said first insulating layer; a first conductor for connecting said first electrode to a reference potential; a second conductor for connecting a first end of said first resistor to said second electrode; a third conductor for connecting a first end of said second resistor to said third electrode; a fourth conductor for connecting said second electrode to said fifth electrode; a fifth conductor for connecting said third electrode to said fourth electrode; a first input terminal connected to a second end of said first resistor and a second input terminal connected to a second end of said second resistor, respectively; and first and second output terminals connected to said fourth electrode and said fifth electrode, respectively, wherein said first electrode and said second electrode form a first capacitor, said first electrode and said third electrode form a second capacitor, said second electrode and said fourth electrode form one capacitor constituting a third capacitor, and said third electrode and said fifth electrode form another capacitor constituting said third capacitor, said first and second resistors and said first, second and third capacitors constituting a first-order differential low pass filter. - View Dependent Claims (3, 4, 5, 6)
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7. A second-order differential low pass filter comprising:
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a first resistor connected between a first input terminal and a first junction point, and a second resistor and connected between the first junction point and a first output terminal; a third resistor having the same resistance value as said first resistor and connected between a second input terminal and a second junction point, and a fourth resistor having the same resistance value as said third resistor and connected between the second junction point and a second output terminal; a first capacitor connected between the first junction point and a reference potential; a second capacitor connected between the first junction point and the second junction point; a third capacitor connected between said first output terminal and said second output terminal; and a fourth capacitor connected between said second output terminal and said reference potential, said fourth capacitor having the same capacitance value as said first capacitor.
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8. An integrated circuit structure comprising:
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a first insulating layer; a first electrode formed to be in contact with a first surface of said first insulating layer; a second electrode and a third electrode formed on opposite second surface of said first insulating layer at positions opposite to said first electrode; a fourth electrode and a fifth electrode formed at positions opposite to said second electrode and said third electrode, respectively, on a second insulating layer covering said second and third electrodes; a first resistor, a second resistor, a third resistor and a fourth resistor formed on the first surface; a first conductor for connecting said first electrode to a reference potential; a second conductor for connecting a first end of said first resistor to a first end of said third resistor and to said second electrode; a third conductor for connecting a first end of said second resistor to a first end of said fourth resistor and to said fourth electrode; a fourth conductor for connecting a second end of said third resistor to said fifth electrode; a fifth conductor for connecting a second end of said fourth resistor to said third electrode; a first input terminal connected to a second end of said first resistor and a second input level connected to a second end of said second resistor; and a first output terminal connected to said third electrode and to said fifth electrode, respectively; wherein said first electrode and said second electrode form a first capacitor, said second electrode and said fourth electrode form a second capacitor, said third electrode and said fifth electrode form a third capacitor and said first electrode and said third electrode form a fourth capacitor, said first, second, third, and fourth resistors and said first, second, third, and fourth capacitors constituting a second-order differential low pass filter. - View Dependent Claims (9, 10, 11, 12)
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13. An integrated circuit structure comprising:
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a first insulating layer; a first electrode formed to be in contact with a first surface of said first insulating layer; a second electrode and a third electrode formed on an opposite second surface of said first insulating layer at positions opposite to said first electrode; a fourth electrode and a fifth electrode formed at positions opposite to said second electrode and said third electrode, respectively, on a second insulating layer; a first resistor, a second resistor, a third resistor and a fourth resistor formed on the second surface of said first insulating layer; a first conductor for connecting said first electrode to a reference potential; a second conductor for connecting a first end of said first resistor to a first end of said third resistor and to said fourth electrode; a third conductor for connecting a first end of said second resistor to a first end of said fourth resistor and to said second electrode; a fourth conductor for connecting a second end of said third resistor to said third electrode; a fifth conductor for connecting the other end of said fourth resistor to said fifth electrode; a first input terminal connected to a second end of said first resistor and a second input terminal connected to a second end of said second resistor, respectively, and first and second output terminals connected to said third electrode and said fifth electrode, respectively; wherein said first electrode and said second electrode form a first capacitor, said second electrode and said fourth electrode form a second capacitor, said third electrode and said fifth electrode form a third capacitor and said first electrode and said third electrode form a fourth capacitor, said first, second, third, and fourth resistors and said first, second, third, and fourth capacitors constituting a second-order differential low pass filter. - View Dependent Claims (14, 15, 16, 17)
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18. A differential high pass filter comprising:
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a first capacitor connected between a first input terminal and a first output terminal; a second capacitor having the same capacitance value as said first capacitor and connected between a second input terminal and a second output terminal; a first resistor connected between said first output terminal and a reference potential; a second resistor having the same resistance value as said first resistor and connected between said second output terminal and said reference potential; and a third resistor connected between said first output terminal and said second output terminal.
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Specification