FREQUENCY CHARACTERISTIC ADJUSTING CIRCUIT, RECEIVING INTERFACE CIRCUIT, AND MAGNETIC STORAGE DEVICE
First Claim
1. A frequency characteristic adjusting circuit that adjusts a frequency characteristic of an input signal, the frequency characteristic adjusting circuit comprising:
- a cutoff range adjusting module configured to be connected to an alternate current coupling circuit capacitively coupled with a signal transmission path and matching terminated, and allow an output signal from the alternate current coupling circuit to pass through such that a low cutoff range in a frequency characteristic of the alternate current coupling circuit varies; and
a control signal inputting module configured to receive a control signal to control a zero-point frequency based on a numerator polynomial of a transfer function of the cutoff range adjusting module and a pole frequency based on a denominator polynomial of the transfer function, whereinthe numerator polynomial of the transfer function of the cutoff range adjusting module is equalized to a denominator polynomial of a transfer function of the alternate current coupling circuit by the control signal, and a cutoff frequency of the low cutoff range is determined by the pole frequency according to the control signal.
2 Assignments
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Accused Products
Abstract
According to one embodiment, a frequency characteristic adjusting circuit includes a cutoff range adjusting module and a control signal inputting module. The cutoff range adjusting module is connected to an AC coupling circuit capacitively coupled with a signal transmission path, and allows an output signal from the AC coupling circuit to pass through such that a low cutoff range in the frequency characteristic of the AC coupling circuit varies. The control signal inputting module receives a control signal to control a zero-point frequency based on a numerator polynomial of a transfer function of the cutoff range adjusting module and a pole frequency based on a denominator polynomial of the transfer function. The numerator polynomial is equalized to a denominator polynomial of a transfer function of the AC coupling circuit by the control signal. A cutoff frequency is determined by the pole frequency according to the control signal.
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Citations
13 Claims
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1. A frequency characteristic adjusting circuit that adjusts a frequency characteristic of an input signal, the frequency characteristic adjusting circuit comprising:
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a cutoff range adjusting module configured to be connected to an alternate current coupling circuit capacitively coupled with a signal transmission path and matching terminated, and allow an output signal from the alternate current coupling circuit to pass through such that a low cutoff range in a frequency characteristic of the alternate current coupling circuit varies; and a control signal inputting module configured to receive a control signal to control a zero-point frequency based on a numerator polynomial of a transfer function of the cutoff range adjusting module and a pole frequency based on a denominator polynomial of the transfer function, wherein the numerator polynomial of the transfer function of the cutoff range adjusting module is equalized to a denominator polynomial of a transfer function of the alternate current coupling circuit by the control signal, and a cutoff frequency of the low cutoff range is determined by the pole frequency according to the control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A receiving interface circuit that receives a signal through a signal transmission path, the receiving interface circuit comprising:
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an alternate current coupling circuit configured to be capacitively coupled with the signal transmission path and matching terminated; and a frequency characteristic adjusting circuit configured to receive an output signal from the alternate current coupling circuit and adjust a frequency characteristic of the alternate current coupling circuit, wherein the frequency characteristic adjusting circuit comprises a cutoff range adjusting module configured to allow the output signal from the alternate current coupling circuit to pass through such that a low cutoff range in the frequency characteristic of the alternate current coupling circuit varies, and a control signal inputting module configured to receive a control signal to control a zero-point frequency based on a numerator polynomial of a transfer function of the cutoff range adjusting module and a pole frequency based on a denominator polynomial of the transfer function, and the numerator polynomial of the transfer function of the cutoff range adjusting module is equalized to a denominator polynomial of a transfer function of the alternate current coupling circuit by the control signal, and a cutoff frequency of the low cutoff range is determined by the pole frequency according to the control signal.
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12. A magnetic storage device that records and reproduces a signal using a magnetic disk medium, the magnetic storage device comprising:
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an alternate current coupling circuit configured to be capacitively coupled with a signal transmission path, where a signal read from the magnetic disk medium is transmitted, and matching terminated; and a frequency characteristic adjusting circuit configured to receive an output signal from the alternate current coupling circuit and adjust a frequency characteristic of the alternate current coupling circuit, wherein the frequency characteristic adjusting circuit comprises a cutoff range adjusting module configured to allow the output signal from the alternate current coupling circuit to pass through such that a low cutoff range in the frequency characteristic of the alternate current coupling circuit varies, and a control signal inputting module configured to receive a control signal to control a zero-point frequency based on a numerator polynomial of a transfer function of the cutoff range adjusting module and a pole frequency based on a denominator polynomial of the transfer function, and the numerator polynomial of the transfer function of the cutoff range adjusting module is equalized to a denominator polynomial of a transfer function of the alternate current coupling circuit by the control signal, and a cutoff frequency of the low cutoff range is determined by the pole frequency according to the control signal. - View Dependent Claims (13)
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Specification