SpectreRF for simulating PLLs?

R

R Wilcock

Guest
Hi all,

I was wondering if anyone had had any success or could suggest a method for
using SpectreRF to derive a frequency response for a PLL? What I want is a
loop (open and closed) gain versus frequency plot.

Cheers

Reuben
 
Reuben,

It's been a while! I was only thinking the other day I'd not seen any posts
from you for a while.

Check out http://www.designers-guide.com as there is a good paper on
PLLs there (for phase noise/jitter). This talks about using phase-domain
modelling of a PLL having characterised it with SpectreRF.

There's also some stuff on the PLL library documented in cdsdoc.

Simulating it directly in SpectreRF is not so easy, but check Ken Kundert's
paper above as it describes the issues well (not surprising since he's
the architect of Spectre and SpectreRF).

Regards,

Andrew.

On Tue, 25 Nov 2003 10:08:00 -0000, "R Wilcock" <reubenwilcock@hotmail.com>
wrote:

Hi all,

I was wondering if anyone had had any success or could suggest a method for
using SpectreRF to derive a frequency response for a PLL? What I want is a
loop (open and closed) gain versus frequency plot.

Cheers

Reuben
Click to expand...
--
Andrew Beckett
Senior Technical Leader
Custom IC Solutions
Cadence Design Systems Ltd
 
Andrew,

Thanks for the help. Yes, it has been a while and it is a delight to still
be able to use this group as the fantastic resource it is.

In case you wondered, Andrew, the full custom chip I was working on when I
was a very active member of this group before was a great success, and I am
now working towards another (a PLL if you hadn't guessed yet!).

Keep up the good work!

Cheers

Reuben


"Andrew Beckett" <andrewb@DELETETHISBITcadence.com> wrote in message
news:3hi7sv8iku6qf590n6588udjn2gqi72l4b@4ax.com...
Reuben,

It's been a while! I was only thinking the other day I'd not seen any
posts
from you for a while.

Check out http://www.designers-guide.com as there is a good paper on
PLLs there (for phase noise/jitter). This talks about using phase-domain
modelling of a PLL having characterised it with SpectreRF.

There's also some stuff on the PLL library documented in cdsdoc.

Simulating it directly in SpectreRF is not so easy, but check Ken
Kundert's
paper above as it describes the issues well (not surprising since he's
the architect of Spectre and SpectreRF).

Regards,

Andrew.

On Tue, 25 Nov 2003 10:08:00 -0000, "R Wilcock"
reubenwilcock@hotmail.com
wrote:

Hi all,

I was wondering if anyone had had any success or could suggest a method
for
using SpectreRF to derive a frequency response for a PLL? What I want is
a
loop (open and closed) gain versus frequency plot.

Cheers

Reuben


--
Andrew Beckett
Senior Technical Leader
Custom IC Solutions
Cadence Design Systems Ltd
Click to expand...
 
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