Frequency generator and frequency correction method for frequency generator
AssigneeLx Semicon Co., Ltd.
InventorHyeong Seok Kim
Life of this patent
Estimating the term…
Abstract
A frequency generator and a frequency correction method for a frequency generator, which have the purpose to provide a frequency correction technology that actively responds to continuous frequency fluctuations of a clock signal through a frequency measurement period of at least two unit periods. The frequency generator comprises: an oscillator which generates an oscillator clock signal; and a frequency correction circuit which selectively operates in one of a normal mode and a fast mode, which have different correction periods according to the state of the oscillator clock signal.
Claims18
A frequency generator comprising:
- an oscillator that generates an oscillator clock signal;
- and
- a frequency correction circuit that selectively operates in one of a normal mode and a fast mode with different correction periods according to a state of the oscillator clock signal,
- wherein the frequency correction circuit generates a flag when the state of the oscillator clock signal during one cycle of the reference clock signal is a noise state in the normal mode, and operates in the fast mode when a flag count corresponding to the flag is greater than or equal to a first count.
A frequency correction method for correcting a frequency of an oscillator in a frequency generator, the frequency correction method comprising:
- generating an oscillator clock signal;
- and
- measuring a frequency of the oscillator clock signal in one of a normal mode and a fast mode with different correction periods according to a state of the oscillator clock signal,
- generating a flag in the normal mode when the state of the oscillator clock signal is a noise state;
- and
- changing to the fast mode when a flag count corresponding to the flag is greater than or equal to a first count.
Dependencies are inferred from the claim text.