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US 8,819,473 B2Granted
Clock integrated circuit
AssigneeMacronix International Co., Ltd.
InventorsChung-Kuang Chen, Chun-Hsiung Hung, Han-Sung Chen
Life of this patent
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Abstract
The clock circuit of an integrated circuit operates with variations such as temperature, ground noise, and power noise. Various aspects of an improved clock integrated circuit address one or more of the variations in temperature, ground noise, and power noise.
Claims10
An apparatus, comprising:
- a clock integrated circuit, comprising:
- a first reference signal including a varying noise signal;
- a timing circuit having an output alternating between the first reference signal and a regulated power at a rate determined by a time constant determining timing of a clock signal output of the clock integrated circuit;
- a reference circuit having an output selectably coupled to the varying noise signal, such that the output of the reference circuit stores a value of the varying noise signal, when the timing circuit output changes between (i) falling from the regulated power to the first reference signal and (ii) rising from the first reference signal to the regulated power;
- and
- a level switching circuit comparing the output of the reference circuit with the output of the timing circuit, such that an output of the level switching circuit determines the clock signal output of the clock integrated circuit.
3 more elements
An apparatus, comprising:
- a clock integrated circuit, comprising:
- a first reference signal including a varying noise signal;
- a timing circuit having an output alternating between the first reference signal and a regulated power at a rate determined by a time constant determining timing of a clock signal output of the clock integrated circuit, wherein an output of the timing circuit stores the value of the varying noise signal included in the first reference signal, when the timing circuit output changes between (i) falling from the regulated power to the first reference signal and (ii) rising from the first reference signal to the regulated power;
- a reference circuit having an output selectably coupled to the varying noise signal;
- and
- a level switching circuit comparing the output of the reference circuit with the output of the timing circuit, such that an output of the level switching circuit determines the clock signal output of the clock integrated circuit.
3 more elements
Dependencies are inferred from the claim text.