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US 8,786,374 B2Granted
Error detection at an oscillator
AssigneeFreescale Semiconductor, Inc.
InventorJon S. Choy
Life of this patent
Estimating the term…
Abstract
An error detection system employs a chain of delay elements connected in an open loop configuration. To determine whether the oscillator is operating within a specified set of parameters, the error detection system applies a start pulse to an input of the open-loop chain of delay elements. The error detection system compares the resulting output signal with the output of the oscillator. If the oscillator has locked onto a harmonic of the intended output frequency, the comparison of the output signals will indicate an error.
Claims19
A method, comprising:
- generating an output signal at an open-loop chain of delay elements;
- determining an oscillator is locked to a harmonic of a desired frequency based on the output signal;
- and
- resetting the oscillator in response to determining the oscillator is locked to the harmonic.
1 more element
A method, comprising:
- enabling a counter based on an output signal of an open-loop chain of delay elements;
- adjusting the counter based on an output of an oscillator;
- detecting the oscillator is locked to a harmonic of a desired frequency based on a value of the counter;
- and
- resetting the oscillator in response to determining the oscillator is locked to the harmonic.
2 more elements
A device, comprising:
- an oscillator;
- an open-loop chain of delay elements;
- and
- an error detection module to:
- determine the oscillator is locked to a harmonic of a desired frequency based on the output signal of the oscillator and an output signal of the open-loop chain of delay elements;
- and
- reset the oscillator in response to determining the oscillator is locked to the harmonic.
4 more elements
Dependencies are inferred from the claim text.