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US 11,695,391 B2Granted
Biquad filter
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorMakoto Morita
Life of this patent
Estimating the term…
Abstract
According to one embodiment, in a biquad filter, an output terminal of a first integrator is connected to an input terminal in a negative pole side of a second integrator, an output terminal of the first integrator is connected to a first input terminal in a negative pole side of an adder through the inversion amplifier, an output terminal of the second integrator is connected to a second input terminal in the negative pole side of the adder, an input terminal to which an input signal is input is connected to a third input terminal in the negative side of the adder, and an output terminal of the adder is connected to an input terminal in a negative pole side of the first integrator.
Claims14
A biquad filter comprising:
- a first integrator including a first operational amplifier, and a first variable resistor and a first condenser connected to the first operational amplifier;
- a second integrator including a second operational amplifier, and a second variable resistor and a second condenser connected to the second operational amplifier;
- an adder including a third operational amplifier and a plurality of resistors connected to the third operational amplifier;
- and
- an inversion amplifier with an amplification rate of 1 time, wherein
- an output terminal of the first integrator is connected to an input terminal in a negative pole side of the second integrator,
- the output terminal of the first integrator is connected to a first input terminal in a negative pole side of the adder through the inversion amplifier,
- an output terminal of the second integrator is connected to a second input terminal in the negative pole side of the adder,
- an input terminal to which an input signal is input is connected to a third input terminal in the negative side of the adder, and
- an output terminal of the adder is connected to an input terminal in a negative pole side of the first integrator,
- the adder includes a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor,
- an output terminal of the first operational amplifier is connected to one terminal of the first condenser, one terminal of the second variable resistor, an input terminal of the inversion amplifier, and an output terminal of a band-pass filter,
- an input terminal in the negative pole side of the first operational amplifier is connected to the other terminal of the first condenser, and one terminal of the first variable resistor,
- an output terminal of the second operational amplifier is connected to one terminal of the second condenser, one terminal of the fourth resistor, and an output terminal of a low-pass filter,
- an input terminal in the negative pole side of the second operational amplifier is connected to the other terminal of the second variable resistor, and the other terminal of the second condenser,
- an output terminal of the third operational amplifier is connected to one terminal of the sixth resistor, the other terminal of the first variable resistor, and an output terminal of a high-pass filter,
- an input terminal in the negative pole side of the third operational amplifier is connected to the other terminal of the sixth resistor, the other terminal of the fourth resistor, one terminal of the fifth resistor, and one terminal of the third resistor,
- an output terminal of the inversion amplifier is connected to the other terminal of the third resistor, and
- the other terminal of the fourth resistor is connected to the input terminal to which the input signal is input.
16 more elements
A biquad filter, comprising:
- a first integrator including a first fully-differential operational amplifier, a first variable resistor connected to the first fully-differential operational amplifier, and a first condenser connected to the first fully-differential operational amplifier;
- a second integrator including a second fully-differential operational amplifier, a second variable resistor connected to the second fully-differential operational amplifier, and a second condenser connected to the second fully-differential operational amplifier;
- and
- an adder including a third fully-differential operational amplifier and a plurality of resistors connected to the third fully-differential operational amplifier, wherein
- an output terminal in a positive pole side of the first integrator is connected to an input terminal in a negative pole side of the second integrator,
- an output terminal in a positive pole side of the second integrator is connected to a first input in a positive pole side of the adder,
- an output terminal in a negative pole side of the first integrator is connected to an input terminal in a positive pole side of the second integrator,
- an output terminal in a negative pole side of the first integrator is connected to a first input terminal in a negative pole side of the adder,
- an output terminal in a positive pole side of the second integrator is connected to a second input terminal in the negative pole side of the adder,
- an output terminal in a negative pole side of the second integrator is connected to a second input terminal in the positive pole side of the adder,
- a first input terminal to which one of positive phase and negative phase of differential input signals is input is connected to a third input terminal in the negative pole side of the adder,
- a second input terminal to which the other one of the positive phase and negative phase of differential input signals is connected to a third input terminal in the positive pole side of the adder,
- an output terminal in the positive pole side of the adder is connected to an input terminal in a positive pole side of the first integrator, and
- an output terminal in the negative pole side of the adder is connected to an input terminal in a positive pole side of the first integrator.
11 more elements
Dependencies are inferred from the claim text.