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US 10,483,999 B1Granted
Loop consistency using multiple channel estimates
AssigneeSeagate Technology LLC
InventorsZheng Wu, Jason Vincent Bellorado, Marcus Marrow
Life of this patent
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Abstract
An apparatus may include a circuit configured to generate, by an analog to digital converter (ADC), one or more ADC samples based on an input signal. The circuit may be further configured to generate a first estimated signal using a first channel pulse response estimation with a gain constraint based on the one or more ADC samples and generate a second estimated signal using a second channel pulse response estimation with a phase constraint based on the one or more ADC samples.
Claims20
An apparatus comprising:
- a magnetic disc storage medium;
- a read head;
- a preamplifier configured to be connected to the read head, wherein the read head is configured to read data from the magnetic disc storage medium, the preamplifier further configured to:
- receive a read signal from the head including the read data from the read head;
- and
- apply a signal processing to the read signal to generate an input signal, the signal processing including at least amplifying the read signal;
- and
- a circuit configured to:
- generate, by an analog to digital converter (ADC), one or more ADC samples based at least in part on the input signal;
- generate a first estimated signal using a first channel pulse response estimation with a gain constraint based on the one or more ADC samples;
- and
- generate a second estimated signal using a second channel pulse response estimation with a phase constraint based on the one or more ADC samples.
9 more elements
A system comprising:
- a magnetic disc storage medium;
- a read head;
- a preamplifier configured to be connected to the read head, wherein the read head is configured to read data from the magnetic disc storage medium, the preamplifier further configured to:
- receive a read signal from the head including the read data from the read head;
- and
- apply a signal processing to the read signal to generate an input signal, the signal processing including at least amplifying the read signal;
- and
- an ADC circuit configured to generate one or more ADC samples based on an input signal from the read head;
- a first channel pulse response estimate circuit configured to generate a first estimated signal using a first channel pulse response estimation with a gain constraint based on the one or more ADC samples;
- and
- a second channel pulse response estimate circuit configured to generate a second estimated signal using a second channel pulse response estimation with a phase constraint based on the one or more ADC samples.
8 more elements
A method comprising:
- reading, by a read head, read data from a magnetic disc storage medium to generate an read signal;
- generating by a preamplifier, an input signal by applying a signal processing to the read signal including at least amplifying,
- generating, by an analog to digital converter (ADC), one or more ADC samples based on the input signal;
- generating a first estimated signal using a first channel pulse response estimation with a gain constraint based on the one or more ADC samples;
- generating a second estimated signal using a second channel pulse response estimation with a phase constraint based on the one or more ADC samples;
- and
- during a preamble portion of the input signal, determining a gain control parameter for a variable gain amplifier (VGA) generating the input signal based on the second estimated signal.
4 more elements
Dependencies are inferred from the claim text.