vertragingvergrendelingslussen

vertragingvergrendelingslussen, also known as delay-locked loops (DLLs), are a type of electronic circuit used in digital systems to synchronize signals. Unlike phase-locked loops (PLLs), which use a voltage-controlled oscillator to generate a feedback signal, DLLs use a delay line. A DLL achieves synchronization by adjusting the delay of a signal to match a reference clock.

The core component of a DLL is a voltage-controlled delay line (VCDL). The input signal is fed into this delay line, and the output of the delay line is compared to the reference clock using a phase detector. The phase detector generates an error signal based on the difference in phase between the delayed signal and the reference clock. This error signal is then used to control the delay of the VCDL, effectively closing the loop.

When the DLL is locked, the output signal from the delay line is precisely aligned in phase with the reference clock. This precise alignment makes DLLs particularly useful for applications requiring accurate timing, such as in memory interfaces like DDR SDRAM, where precise clocking is crucial for data transfer. They are also employed in clock deskewing and jitter reduction. DLLs are generally considered to be simpler in design and consume less power than PLLs for certain applications, though they typically have a narrower lock range.