digital PLL and analog PLL

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liuyonggen_1

Joined: 12 Dec 2005
Posts: 195
Helped: 4

28 Dec 2006 14:51 digital pll

could you tell me the difference and similarities between digital PLL and analog PLL?

diemilio

Joined: 19 Sep 2006
Posts: 311
Helped: 40

29 Dec 2006 7:57 analog pll

Well, I would say the main difference resides on the phase detector. analog PLL uses a multiplier to find the difference between two (analog) signals, while digital PLL uses XORs, JK flip-flops, tristate PDs, to find delays between 2 signals.

You should probably check chapters 2 and 3 from Phase-Locked Loops by Roland E. Best

diemilio

Miguel Gaspar

Joined: 06 Mar 2006
Posts: 391
Helped: 36
Location: Culiacán, Sinaloa, Mexico

29 Dec 2006 23:56 analog pll components

Ok, for an analog PLL the Phase detector is made with an analog device, but with digital PLL is made with a digital device. The rest of the PLL still remains analog.

liuyonggen_1

Joined: 12 Dec 2005
Posts: 195
Helped: 4

31 Dec 2006 3:48 pll logic gate

what's the advantages and disadvantages between the analog PLL and digital PLL?
(except the good linearity of analog PLL)

sparso

Joined: 30 Dec 2006
Posts: 64
Helped: 1

01 Jan 2007 3:28 digital pll design

What is the most efficient way to simulate a digital PLL?
SPICE or some kind of MS simulator like Verilog-A?

Thanks

xwcwc1234

Joined: 21 Jul 2001
Posts: 316
Helped: 5

18 Jan 2007 7:42 pll analog multiplier

I prefer use Matlab for PLL system simulation. After that , you can use Hspice for detailed circuit simulation.

khouly

Joined: 20 Oct 2003
Posts: 2479
Helped: 343
Location: EGYPT

18 Jan 2007 9:19 analog vs digital pll

the PLL is a system , then u must simulate it in system level , and then begin to go through Verilog A , and then circuit

so u can begin with MATLAB , then go to MS simulator ,

u have cadence tools is very good in this issue

khouly

jinxingsun

Joined: 28 Aug 2005
Posts: 89
Helped: 4

20 Jan 2007 4:45 simulation pll spice flip flop

The digital PLL have many advantages such as lower cost,easier fabrication,drift-free components and absense of tolerance problesms.

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20 Jan 2007 4:45 Ads

tlihu

Joined: 02 Jan 2002
Posts: 669
Helped: 5

20 Jan 2007 6:06 all analog pll

Isn't digital PLL made of all digital components such as FF, logic gates?

butterfish

Joined: 26 Oct 2005
Posts: 137
Helped: 6
Location: china

23 Jan 2007 2:32 difference between analog pll and digital pll

digtal PLL: digital PFD+charge pump+LPF+VCO, most porpular now;
all digtal PLL: digital PFD+digital low pass filter+DCO, it have high phase noise, for example, MT4409 from Zarlink;
analog PLL: analog PFD+LPF+VCO.

master_picengineer

Joined: 03 Sep 2007
Posts: 1050
Helped: 62

26 Sep 2007 9:35 dpll algorithm digital pll

Hi,

Could anybody tell me breefly:
1- What is the role of each component od a DPLL (digital PFD+charge pump+LPF+VCO) ?
2- Explain how all this component generate together the clock signal ?
3- When designing a DPLL, what component should be done first ?
Thanks in advance.