Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

ask for build 10GHz Local Oscillator ~~?

Status
Not open for further replies.

petezhanghui

Newbie level 3
Joined
Feb 11, 2011
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Location
ShenZhen,China
Activity points
1,306
Which IC~~choose ??
I need build a 10GHz Local Oscillator.


features:
(SSB)
100Hz __ -75 dBc/Hz
1KHz __ -95 dBc/Hz
10KHz __ -105 dBc/Hz
100KHz __ -115 dBc/Hz

~~~thanks!!!
 

tony_lth

Advanced Member level 5
Joined
Jul 28, 2010
Messages
2,028
Helped
376
Reputation
754
Reaction score
371
Trophy points
1,363
Location
Beijing
Activity points
12,085
The PN is very strict, so Hittite can't reach that. Do you need a single point freq or a span freqs?
 

BigBoss

Advanced Member level 5
Joined
Nov 17, 2001
Messages
5,112
Helped
1,529
Reputation
3,056
Reaction score
1,376
Trophy points
1,393
Location
Turkey
Activity points
30,746
thanks,
I need a single point freq,,,,,,,,,,,,,10GHz.
If you need a single point oscillation frequency, in this case don't consider VCOs...
Instead, consider DRO type discrete or module type oscillators because VCOs are noisy elements.
Especially varactor tuned DROs can be tuned in very narrow frequency bands and so silent devices..
 

petezhanghui

Newbie level 3
Joined
Feb 11, 2011
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Location
ShenZhen,China
Activity points
1,306
thanks~ BIGBOSS
"Instead, consider DRO type discrete or module type oscillators"

Which IC~~choose ?????
 

davenn

Advanced Member level 3
Joined
Jul 1, 2009
Messages
844
Helped
192
Reputation
384
Reaction score
163
Trophy points
1,323
Location
Sydney, Australia
Activity points
6,381
thanks~ BIGBOSS
"Instead, consider DRO type discrete or module type oscillators"
Which IC~~choose ?????

isnt an IC .... do a google search on DRO 's to find out about them.

All Satellite LNC's use DRO's you could always retune the 10.7GHz one to the freq you need. wouldnt be too difficult
and as Bigboss hinted at they have very low phase noise :)

Dave
 

BigBoss

Advanced Member level 5
Joined
Nov 17, 2001
Messages
5,112
Helped
1,529
Reputation
3,056
Reaction score
1,376
Trophy points
1,393
Location
Turkey
Activity points
30,746
thanks~ BIGBOSS
"Instead, consider DRO type discrete or module type oscillators"

Which IC~~choose ?????
Dielectric Resonator Oscillators
You can check what it is but your PN requirements are very tight..
You'd better research some IEEE papers for design techniques because design a DRO is not easy and it's required an amount of EM simulation and practical implementation.
But as I said before, your PN requirement is very tight and you must use Bipolar Transistor to get this very low Close-In PN spec.( Because high 1/f noise of GaAs devices) But unfortunately, Bipolars are not so good at those frequencies and hard to find them.( Maybe custom designs..)..
Good Luck
 

davenn

Advanced Member level 3
Joined
Jul 1, 2009
Messages
844
Helped
192
Reputation
384
Reaction score
163
Trophy points
1,323
Location
Sydney, Australia
Activity points
6,381
thanks, Dave
thanks, BigBoss
Would you give me URL about some IEEE papers about DRO ?

you're welcome :) a google search will probably bring up some results for you

I use DRO's where stability isnt of high importance like in TV transmitter / receiver applications at 10 and 24 GHz
When the TV signal is ~ 8HMz or so wide, several 100kHz of drift isnt a real problem
DRO's can be phase locked and I have a 24GHz system that does that.

Another suggestion that no one has mentioned and I forget to..... you might want to consider YIG oscillators. They are available for many freqs and on ebay I have bought ones that cover 8 - 10GHz and 9.2 to 11.2 GHz. These are also able to be PLL'ed have a look at this example from ebay...
YIG OSCILLATOR and PLL Controller 1MHz Steps 8 -10GHz (eBay item 160543113022 end time 15-Feb-11 12:28:02 AEDST) : Business Industrial

this is the same style as the units I have. YIG's also have reasonably good phase noise

Stellex’s YIG [Yttrium Iron Garnet] technology provides a frequency source with high spectral purity for high-frequency communications applications.
Mini-YIG Tuned Oscillators
• 9 GHz in Center Frequency
• Low Phase Noise
• –105 dBc/Hz @ 10K (typ.)
• –128 dBc/Hz @ 100K (typ.)
• Up to ±1 GHz Tuning Range
• Output Power +14.5 dBm (typ.)
• Outstanding Phase Hit Performance in 64 and 128 QAM Radio Systems
• Offered in SMA Connector Package


cheers
Dave
VK2TDN

---------- Post added at 10:11 ---------- Previous post was at 10:03 ----------

thanks, Dave
thanks, BigBoss

Would you give me URL about some IEEE papers about DRO ?

That link in Bigboss's last post will take you to an articl on DRO's and the bottom of the article are a lis of references that includes a number of IEEE papers

Dave
 
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top