PAM4 equalization DSM
AssigneeLitrinium, Inc.
InventorSebastien Douyere
Life of this patent
Estimating the term…
Abstract
In a system for calibrating PAM4 signals, an equalizer determines a first signal amplitude measurement of the PAM4 signal. The equalizer determines a first signal boost measurement of the PAM4 signal. The equalizer determines whether the first signal boost measurement and the signal amplitude measurement are substantially consistent with each other. Responsive to determining that the signal boost and the signal amplitude are not substantially consistent with each other, the equalizer determines a reference amplification modification and calibrates a PAM4 signal according to the determined reference amplification modification.
Claims6
A method of automatically equalizing a PAM4 signal, comprising:
- generating a reference signal for the PAM4 signal by slicing the PAM4 signal into a first level and a second level;
- determining a constant coefficient;
- amplifying the reference signal by the constant coefficient, wherein the amplified reference signal is used to modulate the PAM4 signal;
- determining a first signal amplitude measurement of the PAM4 signal;
- determining a first signal boost measurement of the PAM4 signal;
- determining whether the first signal boost measurement and the signal amplitude measurement are substantially consistent with each other;
- responsive to determining that the signal boost and the signal amplitude are not substantially consistent with each other, determining a reference amplification modification;
- and
- calibrating a PAM4 signal according to the determined reference amplification modification.
A system for equalizing a PAM4 signal, comprising;
- an PAM4 signal equalizer configured to:
- generate a reference signal for the PAM4 signal by slicing the PAM4 signal into a first level and a second level;
- determine a constant coefficient;
- amplify the reference signal by the constant coefficient, wherein the amplified reference signal is used to modulate the PAM4 signal;
- determine a first signal amplitude measurement of the PAM4 signal;
- determine a first signal boost measurement of the PAM4 signal;
- determine whether the first signal boost measurement and the signal amplitude measurement are substantially consistent with each other;
- and
- responsive to determining that the signal boost and the signal amplitude are not substantially consistent with each other, determine a reference amplification modification;
- and
- calibrate a PAM4 signal according to the determined reference amplification modification.
Dependencies are inferred from the claim text.