Differences between revisions 8 and 23 (spanning 15 versions)

Low Noise VCOs

Descriptions

Low phase noise, a center frequency of 70 MHz, actuation range of several 100 kHz, aaa dBm output

Prototype model

Noise performance

Worse than the specification for the non-divided phase noise (klog 7425).
Most of the RF components are not secured to the chassis. This may cause undesired acoustic coupling.

Measured freq. noise (klog 7425)

Frequency [Hz]	Measured Frequency noise [Hz/Hz^1/2]	Equivalent Phase noise [dBc/Hz]	ROS-102-919 specification w/o frequency division [dBc/Hz]
0.01	5	51	--
0.1	0.4	9	--
1	0.1	-23	--
10	0.05	-49	--
100	0.05	-69	--
1,000	0.05	-89	-98
10,000	0.03	-113	-123
100,000	--	--	-143

Tuning Range

Endeavour model

Sophisticated version of the prototype model.

Bill of Materials

KAGRA/Subgroups/MIF/AEL/LowNoiseVCOs (last edited 2019-11-12 11:32:54 by KiwamuIzumi)

-  ⇤ ← Revision 8 as of 2019-07-17 15:07:08 → 
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- . Designed by Y. Enomoto (2018), inspired by LIGO low noise VCOs.
+----
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- . [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8968| Prototype VCO JGW-D1808968]]
+ * Designed by Y. Enomoto (2018), inspired by LIGO low noise VCOs. [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8968| JGW-D1808968]]
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- .  [[attachment:6552_20181014103858_lnvcopn.png]]
+=== Noise performance ===
 * Worse than the specification for the non-divided phase noise ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7425|klog 7425]]).
 * Most of the RF components are not secured to the chassis. This may cause undesired acoustic coupling.
 .  {{attachment:7425_20181218132925_lnvcopn2.png|Measured freq. noise (klog 7425) | width=400}}

  || ''' Frequency [Hz] ''' ||  ''' Measured Frequency noise [Hz/Hz^1/2] ''' ||  ''' Equivalent Phase noise [dBc/Hz] ''' || '''ROS-102-919 specification w/o frequency division [dBc/Hz]'''||
  || 0.01 || 5 || 51 || --||
  || 0.1  || 0.4 || 9 || -- ||
  || 1 ||  0.1 || -23 || -- ||
  || 10 || 0.05 || -49 || -- ||
  || 100 || 0.05 || -69 || -- ||
  || 1,000 || 0.05 || -89 || -98 ||
  || 10,000 || 0.03 || -113 || -123 ||
  || 100,000 || -- || -- || -143 ||

=== Tuning Range ===
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+<<BR>>
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+----