Voltage-controlled analog delay locked loop

An analog delay locked loop for receiving a reference clock signal and for generating a delayed output clock signal includes a voltage controlled delay line, a fixed delay line, a delay voltage control, a fast/slow latch, a phase detector, as well as reset and clock off circuits. The fast/slow latch...

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Bibliographische Detailangaben
Hauptverfasser: HEIGHTLEY, JOHN, EATON, STEVE S
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:An analog delay locked loop for receiving a reference clock signal and for generating a delayed output clock signal includes a voltage controlled delay line, a fixed delay line, a delay voltage control, a fast/slow latch, a phase detector, as well as reset and clock off circuits. The fast/slow latch generates three signals that are received by the delay voltage control: a ""latched slow signal"", a ""latched fast signal"", as well as a ""latched fast to slow signal"". The phase detector generates ""go fast"" and ""go slow"" signals that are received by the fast/slow latch. The analog delay locked loop sets the initial delay of the delay line at or near its minimum value on start-up. The delay is then forced to increase from the minimum value until a locking condition is achieved independent of the phase relationship between the reference and delayed clock signals.