Patent ID: 8456210

Claim:
A method of calibrating a DLL, the DLL comprising a phase detector having a reference input and a feedback input, the phase detector being designed to generate a pair of error signals representing a phase difference between signals received on the reference input and the feedback input, the DLL also comprising an amplifier having a first input and a second input, the amplifier being designed to amplify the difference of voltages at the first input and the second input, a first error signal of the pair being provided on a first path to the first input and a second error signal of the pair being provided on a second path to the second input, the method comprising: providing an identical signal on both of the reference input and the feedback input; examining an output of the amplifier to identify a first comparison result between the voltages on the first input and the second input; and changing an electrical characteristic of the signal on at least one of the first path and the second path until a second comparison result is obtained at the output of the amplifier.