Separating jitter components in a data stream
OwnerThomas E. Waschurainventor
Life of this patent
Estimating the term…
Abstract
A method and corresponding device for measuring jitter in a data stream and separating the jitter into its various components is disclosed. The measurement device includes a sampling circuit operative to provide a sampled version of an input data stream in response to a sampling control signal; a comparison circuit operative to provide a signal representing the difference between the sampled input data and a reference pattern; an error counter circuit operative to maintain the number of times the sampled input data does not match the reference pattern or a bit selection value within a bit window; and a bit selector circuit operative to provide the bit selection value in response to the bit sampling window of the circuit.
Claims15
A measurement circuit, comprising:
- a sampling circuit operative to provide a sampled version of an input data stream in response to a sampling control signal;
- a comparison circuit operative to provide a signal representing the difference between the sampled input data and a reference pattern;
- an error counter circuit operative to maintain the number of times the sampled input data does not match the reference pattern or a bit selection value within a bit window;
- and
- a bit selector circuit operative to provide the bit selection value in response to the bit sampling window of the circuit.
A jitter measurement and separation method, comprising:
- sampling an input data stream;
- comparing the input data stream to a reference data stream at predetermined programmable time intervals;
- determining the amount of random jitter present within the input data stream;
- and
- determining the amount of deterministic jitter present within the input data stream, which comprises the steps of determining the amount data dependent jitter present within the input data stream and determining the amount of periodic jitter present within the input data stream.
Dependencies are inferred from the claim text.