Patent ID: 11936389
Assignee: ANALOG DEVICES INTERNATIONAL UNLIMITED COMPANY
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 7:
8. A method of calibration for external delay in a timing alignment system, the method comprising:
generating a delay control signal based on comparing a reference clock signal to a feedback clock signal using a detector of a delay locked loop (DLL);
generating the feedback clock signal by delaying the reference clock signal based on the delay control signal using a controllable delay line of the DLL;
providing an adjustment to the controllable delay line to compensate for a delay of the feedback clock signal in reaching the detector using a delay compensation circuit;
operating the DLL in a first mode in which the feedback clock signal bypasses an external delay circuit;
determining a measured delay through the external delay circuit when the DLL operates in the first mode; and
adjusting the controllable delay line based on the measured delay.