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US 6,147,825 AGranted
Timer with temperature compensation of time delays
AssigneeSTMicroelectronics S.r.l.
InventorsRoberto Alini, Melchiorre Bruccoleri, Gaetano Cosentino, Marco Demicheli
Life of this patent
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Abstract
A temperature-compensated high-speed timing circuit, which is particularly advantageous in read-interface circuits for disk-drive interface. The voltage on the integrating capacitor is compared against a voltage defined by the drop, on a resistor, induced by a current which is the combination of a reference current from a reference current generator with a temperature-dependent current from another current generator.
Claims14
A computer disk drive, comprising:
- a rotatable storage media to store data representing a plurality of data patterns;
- a motor to rotate the storage media;
- a read head positioned proximate the storage media to detect the plurality of data patterns therefrom;
- and
- a read circuit coupled to the read head to generate data based on the detected data patterns, the read circuitry including a clock circuit to produce a timing signal for data timing recovery;
- the clock circuit comprising:
- a timing capacitor;
- a first current generator to generate a first current at a current output, said current output coupled to said timing capacitor;
- a programmable current generator to generate a programmable current at an output of said programmable current generator;
- a supplemental current generator whose output is more temperature-dependent than said output of said programmable current generator;
- a load impedance driven by said output of said programmable current generator and by output of said supplemental current generator to generate a reference voltage;
- and
- a comparator connected to compare a voltage of said timing capacitor against said reference voltage, to accordingly produce a timing output signal.
10 more elements
A disk drive method of operation, comprising:
- rotating a storage media containing data representing a plurality of data patterns;
- positioning a read head in proximity with the rotating storage media;
- using a clock signal to detect the plurality of data patterns from the rotating storage media;
- and
- generating the clock signal by:
- connecting a current generator to an integration capacitor;
- generating a first current;
- generating a second current whose current value has a much larger temperature dependence than the first current;
- generating a reference voltage on a load impedance by applying a reference current to the load impedance, the reference comprising said first and second currents;
- and
- comparing the voltage on the integration capacitor against the reference voltage to produce the clock signal.
8 more elements
Dependencies are inferred from the claim text.