A
Alex
- Jan 1, 1970
- 0
Can someone provide me some schematics example of charge pump circuit for PLL's?
Can someone provide me some schematics example of charge pump circuit for PLL's?
No. Sounds like a homework question. Read your textbook or any
databook on PLL's.
No. Sounds like a homework question. Read your textbook or any
databook on PLL's.
In Jim Thompson typed:
What does a PLL need a charge pump for anyway?
In Jim Thompson typed:
What does a PLL need a charge pump for anyway?
Tom Del Rosso said:In Jim Thompson typed:
What does a PLL need a charge pump for anyway?
To add deadband and guarantee lots of jitter.
I coined the phrase "charge pump" 40 years ago
to describe a filter driven by pulses of current.
Jim Thompson wrote...
So, how much did you charge for your pumps?
Thanks,
- Win
whill_at_picovolt-dot-com
He should have called them 'trainers' and charged $$$ for them (;;-)Jim Thompson wrote...
So, how much did you charge for your pumps?
I was working for Motorola at the time. IIRC the payoff for patents
was $600 per... $100 at application, $500 at issue.
It's an output stage of a phase detector used to charge a filter
cap(s).
Yup. To power the pumps to pump the He back here.to pump electrons onto mars, may be?
Ehhhh?
It's an output stage of a phase detector used to charge a filter
cap(s).
whereas a LP filter would provide a charge
proportional to pulse width. John cites some disadvantages, so why
would anybody do this?
For real. I thought the idea was for the thing to not output pulses
when the PLL was in lock, thus eliminating ripple and jitter.
Tom said:In Active8 typed:
All I've ever seen was LP filters. It sounds like it provides a fixed
quantity of charge per pulse,
whereas a LP filter would provide a
charge proportional to pulse width. John cites some disadvantages,
so why would anybody do this?
I coined the phrase "charge pump" 40 years ago to describe a filter
driven by pulses of current.
"Charge pump" has since also been used to describe "charge-and-dump"
power supplies that utilize only capacitors for energy storage.
...Jim Thompson