Signal pattern and dispersion tolerant statistical reference oscillator
Disclosed is a statistical reference oscillator that includes: a stochastic reference clock generator which receives an input data outputs a reference signal obtained by dividing the received input data at a first frequency division ratio; a frequency divider which divides the frequency of an output signal at a second frequency division ratio and outputs a feedback signal; a frequency detector which outputs a difference signal based on a difference between the reference signal and the feedback signal; and an output signal generator which outputs the output signal based on the difference signal.
1. A statistical reference oscillator comprising:
a stochastic reference clock generator which receives input data and outputs a reference signal obtained by dividing the received input data at a first frequency division ratio;
a frequency divider which divides the frequency of an output signal at a second frequency division ratio and outputs a feedback signal;
a frequency detector which outputs a difference signal based on a difference between the reference signal and the feedback signal;
an output signal generator which outputs the output signal based on the difference signal; and
a consecutive identical digit (CID) compensation block which prevents a non-random signal within the input data from being inputted to the frequency detector by skipping the non-random signal.
2. The statistical reference oscillator of claim 1 , wherein the stochastic reference clock generator comprises a multiple threshold slicer and wherein the multiple threshold slicer detects a signal of the input data by using multiple thresholds.
3. The statistical reference oscillator of claim 2 , wherein the second division ratio is four times as much as the first division ratio.
4. The statistical reference oscillator of claim 3 , wherein be first division ratio is equal to or greater than 128.
5. The statistical reference oscillator of claim 2 , wherein the stochastic reference clock generator further comprises a frequency divider and wherein the frequency divider of the stochastic reference clock generator divides an input signal from the multiple threshold slicer at the first division ratio.
6. The statistical reference oscillator of claim 5 , wherein the second division ratio is four times as much as the first division ratio.
7. The statistical reference oscillator of claim 6 , wherein the first division ratio is equal to or greater than 128.
8. The statistical reference oscillator of claim 5 , wherein the difference signal corresponds to an up-pulse signal or a down-pulse signal based on the difference between the reference signal and the feedback signal.
9. The statistical reference oscillator of claim 8 , wherein the output signal generator comprises:
a charge pump which charges or discharges electric charges in response to the up-pulse signal or the down-pulse signal; and
a voltage controlled oscillator of which oscillation frequency varies in response to an output signal of the charge pump.
10. The statistical reference oscillator of claim 2 , wherein the difference signal corresponds to an up-pulse signal or a down-pulse signal based on the difference between the reference signal and the feedback signal.
11. The statistical reference oscillator of claim 10 , wherein the output signal generator comprises:
a charge pump which charges or discharges electric charges in response to the up-pulse signal or the down-pulse signal; and
a voltage controlled oscillator of which oscillation frequency varies in response to an output signal of the charge pump.
12. The statistical reference oscillator of claim 1 , wherein the difference signal corresponds to an up-pulse signal or a down-pulse signal based on the difference between the reference signal and the feedback signal.
13. The statistical reference oscillator of claim 12 , wherein the output signal generator comprises:
a charge pump which charges or discharges electric charges in response to the up-pulse signal or the down-pulse signal; and
a voltage controlled oscillator of which oscillation frequency varies in response to an output signal of the charge pump.
14. The statistical reference oscillator of claim 1 , wherein the second division ratio is four times as much as the first division ratio.
15. The statistical reference oscillator of claim 14 , wherein the first division ratio is equal to or greater than 128.
16. The statistical reference oscillator of claim 1 , wherein the CID compensation block receives the reference signal and the output signal and determines the non-random signal within the input data by using a mean and a variance of the reference signal.