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US 6,552,865 B2Granted
Diagnostic system for a read/write channel in a disk drive
AssigneeInfineon Technologies AG
InventorSasan Cyrusian
Life of this patent
Estimating the term…
Abstract
The invention provides a read/write channel with a diagnostic system for a disk drive. The diagnostic system may process internal and external signals. The read/write channel may have one or more clock generators, a digital to analog converter, an analog comparator, and a successive approximation register. The read/write channel may be implemented on an integrated circuit or a complementary metal oxide semiconductor. The read/write channel may have partial response maximum likelihood (PRML) encoding and decoding. The diagnostic system uses bit-weighing or successive approximation to convert analog signals into digital diagnostic signals.
Claims14
A disk drive, comprising:
- a read/write channel implemented on an integrated circuit;
- a diagnostic system having bit-weighing conversion and having a diagnostic output responsive to a diagnostic input voltage, where the diagnostic system comprises,
- a digital to analog converter having an analog output responsive to a diagnostic input signal,
- an analog comparator coupled to compare the diagnostic input voltage with the analog output,
- a successive approximation register coupled to receive at least one register value from the analog comparator, the successive approximation register having the diagnostic output responsive to the at least one register value,
- a first analog multiplexer coupled to receive the analog output from the digital to analog converter, where the first analog multiplexer is coupled to receive at least one test signal from the read/write channel, and
- a second analog multiplexer coupled to receive the at least one test signal from the first analog multiplexer,
- where the second analog multiplexer is coupled to receive the diagnostic input voltage, and
- where the analog comparator is coupled to receive the at least one test signal and the diagnostic input voltage from the second analog multiplexer.
6 more elements
A disk drive, comprising:
- a read/write channel implemented on an integrated circuit;
- a diagnostic system having bit-weighing conversion and having a diagnostic output responsive to a diagnostic input voltage, where the diagnostic system comprises,
- a digital to analog converter having an analog output responsive to a diagnostic input signal,
- an analog comparator coupled to compare the diagnostic input voltage with the analog output,
- a successive approximation register coupled to receive at least one register value from the analog comparator, the successive approximation register having the diagnostic output responsive to the at least one register value, and
- a digital multiplexer coupled to provide the diagnostic input signal to the digital to analog converter, and where the digital multiplexer is coupled to receive the diagnostic output signal from the successive approximation register.
3 more elements
A disk drive, comprising:
- a diagnostic system having bit-weighing conversion and having a diagnostic output responsive to a diagnostic input voltage, where the diagnostic system comprises,
- a digital to analog converter having an analog output responsive to a diagnostic input signal,
- an analog comparator coupled to compare the diagnostic input voltage with the analog output, and
- a successive approximation register coupled to receive at least one register value from the analog comparator, the successive approximation register having the diagnostic output responsive to the at least one register value;
- and
- a read/write channel implemented on an integrated circuit, where the read/write channel comprises a digital part to receive the diagnostic output signal, where the digital part provides the a diagnostic input signal to the digital to analog converter.
3 more elements
A read/write channel for a disk drive, where the read/write channel is implemented on an integrated circuit, the read/write channel comprising:
- a digital to analog converter coupled to receive at least one clock signal, the digital to analog converter having an analog output responsive to a diagnostic input signal and the at least one clock signal;
- an analog comparator coupled to compare a diagnostic input voltage with the analog output from the digital to analog converter;
- a successive approximation register coupled to receive at least one register value from the analog comparator, the successive approximation register having a diagnostic output responsive to the at least one register value;
- a first analog multiplexer coupled to receive the analog output from the digital to analog converter, where the first analog multiplexer is coupled to receive the at least one test signal;
- and
- a second analog multiplexer coupled to receive the at least one test signal from the first analog multiplexer,
- where the analog comparator is coupled to receive the at least one test signal and the diagnostic input voltage from the second analog multiplexer.
4 more elements
A read/write channel for a disk drive, where the read/write channel is implemented on an integrated circuit, the read/write channel comprising:
- a digital to analog converter coupled to receive at least one clock signal, the digital to analog converter having an analog output responsive to a diagnostic input signal and the at least one clock signal;
- an analog comparator coupled to compare a diagnostic input voltage with the analog output from the digital to analog converter;
- a successive approximation register coupled to receive at least one register value from the analog comparator, the successive approximation register having a diagnostic output responsive to the at least one register value;
- and
- a digital multiplexer coupled to provide the diagnostic input signal to the digital to analog converter, and where the digital multiplexer is coupled to receive the diagnostic output signal from the successive approximation register.
2 more elements
A read/write channel for a disk drive, where the read/write channel has partial response maximum likelihood (PRML) encoding and decoding, and where the read/write channel is implemented on a complementary metal oxide semiconductor, the read/write channel comprising:
- a digital multiplexer;
- at least one clock generator;
- a digital to analog converter coupled to receive a diagnostic input signal from the digital multiplexer and coupled to receive at least one clock signal from the at least one clock generator, the digital to analog converter having an analog output responsive to the diagnostic input signal and the at least one clock signal;
- a first analog multiplexer coupled to receive the analog output from the digital to analog converter;
- a pin driver buffer coupled to receive the analog output and at least one test signal from the first analog multiplexer;
- an analog comparator coupled to receive the analog output from the digital to analog converter, the analog comparator to compare the analog output with the diagnostic input voltage;
- and
- a successive approximation register coupled to receive at least one register value from the analog comparator, the successive approximation register having a diagnostic output responsive to the at least one register value,
- where the digital multiplexer is coupled to receive the diagnostic output signal from the successive approximation register.
6 more elements
Dependencies are inferred from the claim text.