Method and arrangement for determining the phase difference betw

Details Method and arrangement for determining the phase difference betw Method and arrangement for determining the phase difference betw

1996-01-19

1997-12-30

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

324 7654, 327253, 327161, H03K 526, G01R 2918

Patent

active

057034800

ABSTRACT:
The method determines the phase difference in phase locked loops using clock signals (ts) generated in clock generators of communication equipment are synchronized to incoming reference clock signals (rts). The phase difference is determined by a rough phase difference and by a fine phase difference. The fine phase difference is represented by the plurality of delay elements (VE) of a delay line (VZL) that an incoming reference clock signal (rts) traverses up to the following clock signal (ts). A precise determination of the absolute delay time of a delay element (VE) is possible using the method, whereby components' tolerances cause considerable delay time differences of a delay element (VE) or, respectively, of the delay line (VZL). A considerable enhancement of the precision in determining the phase difference of cloak signals (ts) and reference clock signals (rts) and, thus, of the phase locked loops is achieved by the more precise determination of the absolute delay time of a delay element (VE).

REFERENCES:
patent: 4963817 (1990-10-01), Kohiyama
patent: 5412311 (1995-05-01), Rothermel
patent: 5416444 (1995-05-01), Yamauchi
patent: 5568071 (1996-10-01), Hoshino

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