40m
QIL
Cryo_Lab
CTN
SUS_Lab
TCS_Lab
OMC_Lab
CRIME_Lab
FEA
ENG_Labs
OptContFac
Mariner
WBEEShop
|
40m Log |
Not logged in |
 |
|
Sun Mar 28 17:28:26 2010, matt, kiwamu, Update, Green Locking, frequency discriminator for green PLL 6x
|
Mon Mar 29 15:19:33 2010, mevans, Update, Green Locking, frequency discriminator for green PLL
|
Wed Mar 31 02:57:48 2010, kiwamu, Update, Green Locking, frequency counter for green PLL
|
Wed Mar 31 12:30:31 2010, rana, Update, Green Locking, frequency counter for green PLL
|
Thu Apr 1 15:21:12 2010, rana, Update, Green Locking, frequency counter for green PLL
|
|
Message ID: 2728
Entry time: Mon Mar 29 15:19:33 2010
In reply to: 2718
Reply to this: 2737
|
Author: |
mevans |
Type: |
Update |
Category: |
Green Locking |
Subject: |
frequency discriminator for green PLL |
|
|
Thanks for the great entry!
In order to make this work for higher frequencies, I would add Hartmut's suggestion of a frequency dividing input stage. If we divide the input down by 100, the overall range will be about 200MHz, and the noise will be about 20Hz/rtHz. That might be good enough... but we can hope that the commercial device is lower noise!
Quote: |
Last Friday, Matt made a frequency discriminator circuit on a bread board in order to test the idea and study the noise level. I think it will work for phase lock acquisition of Green locking.
As a result a response of 100kHz/V and a noise level of 2uV/rtHz @ 10Hz are yielded. This corresponds to 0.2Hz/rtHz @ 10Hz.
The motivation of using frequency discriminators is that it makes a frequency range wider and easier for lock acquisition of PLLs in green locking experiment.

|
|