If you're calling it a low pass filter and not an integrator, then you're saying that it has finite DC gain. Therefore your loop is type 0.
-- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
Software
the same DBS
mixer in an
very clean
the peak looked
wobbled and
ugly. Or has the
I find that I misspoke. I looked up the schematic, and I actually used the S74 as a harmonic mixer, clocked at 10 MHz and sampling the
70+-0.454545... MHz crystal oscillators. I then locked those to the output of a divide-by-22 counter running off the same 10 MHz.Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
With 10s time constant (15mHz corner frequency) and more gain so that GWB is circa 3Kz, that makes for more than 100dB DC loop gain. I'd sure call it an integrator, which I guess is George's point.
-- Thanks, Fred.
no
,type
hit
r?
rfor
nd
ot
e've
u've
ain).
aext -
st -
Cool thanks, I don't know the Q, but I'd guess it's above 10.
A multi layer stack from a Japanesse company whose name is escaping me now... (~4 um at 100V with a SRF of ~400kHz.) Driving an Al (7075) flexure with a grating attached.
It'd be nice to get above 3kHz since there's still mucho vibrations up there. (This is a bit of a 'throw away' part of the diode laser, it's mostly a student insturment and they're happy to get it tuned to an Rb line and see the SAS.)
George H.
, r l
ond
Certainly whatever I 'call' it can't make a difference. (I may give it the wrong name.) Sure it's got finite gain at DC. But so does every integrator I've ever made.
There's after all some leakage in my cap, pcb, solder and flux 'cocktail'.
George H.
(DC is just a myth anway.)
e quoted text -
regular
"P
Then it becomes your job as author to clarify the use consistently and extensively.
?-)
Which is exactly what I did.
-- My liberal friends think I'm a conservative kook. My conservative friends think I'm a liberal kook. Why am I not happy that they have found common ground? Tim Wescott, Communications, Control, Circuits & Software http://www.wescottdesign.com
not sure how receptive they are.
they should do, I've never seen one with a warning against pointing it at a mirror.
-- ?? 100% natural --- news://freenews.netfront.net/ - complaints: news@netfront.net ---
Most lasers don't like seeing their own reflection, though it normally won't hurt them, but it does interfere with the LASER action. Mostly a problem on an optical bench, though.
Now, pointing one at a phase conjugate mirror is a different question. Actually, any shiny object near a phase conjugate mirror can get interesting.
In the DSP sense, consider a device that, given a sequence of samples, returns the sequence in the opposite order. (And, I believe, for complex samples the complex conjugate.)
-- glen
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.