Difference between a DLL and a PLL

When I think of DLL, I think of Microsoft's #%^&^. When I think of PLL, I think of the fine Philip's IC offerings.

DLL = delay-locked loop. A time-difference comparator servoes a variable-delay element.

PLL = phase-locked loop. A frequency/phase comparator servoes a voltage-controlled oscillator.

Definitions are subject to flames.

Neither has an inherent jitter advantage, although a pll can have less output jitter than it has input jitter, and a dll usually can't.

John

DLL = Dynamic Link Library PLL = Phase Locked Loop

Context would help !!

donald

I did mean delay locked loop and phase locked loop.

Thanks john.

I am a little confused by the nomenclature but cant a variable-delay element be considered as an oscillator.

Not in a DLL. A DLL just takes the incoming signal and delays it by a variable, feed-backable amount.

A variable delay element can be used to _make_ an oscillator, but you need an amplifying element to go along with it.

DLL, Delay Locked Loop, used to edge-synchronize clock distribution in a fast multi-chip system.

PLL, Phase Locked Loop, usually used to generate multiples of a reference frequency, however analog PLL's can be used to recover signals buried in noise.

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |