Differences between revisions 13 and 36 (spanning 23 versions)

Low Noise VCOs

Descriptions

Low phase noise, a center frequency of 80 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) at 1 and 10 kHz. See the table below.
Most of the RF components are not secured to the chassis in order to allow for the quick implementation. 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

Linear range of 0.8 to 2.8 V achieved (klog 6544, klog 6638). This is smaller than the expected range of 0-5 V.
Resulting frequency showed some kind of hops, limiting the linear range. No clear explanation exists at the moment.
Tuning sensitivity of 0.42 MHz/V is achieved (klog 6544). This is consistent with the specification of ROS-102-919 whose sensitivity is 4.5 MHz/V typ.

Endeavour model

Sophisticated version of the prototype model.

Bill of Materials

Description	Part number	Manufacture	Notes	Price/each
Seed VCO	ROS-102-191 (with eval.board TB-10)	Minicicruits	center freq. 100 MHz
RF amp for VCO output	LNBA-0-13-BJ-100-15	Wenzel
RF amp for LO	LNBA-10-23-AE-100-15	Wenzel	+23 dBm output
RF amp for the output signal	LNBDA-2-26-AC-AE-100-15	Wenzel	+26 dBm output
Frequency divider	LNFD2-10-100-13-1-13-15	Wenzel	factor of 10
Low noise Mixer	LNMX-X-X-X	Wenzel	no attenuation

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

-  ⇤ ← Revision 13 as of 2019-07-17 16:15:22 → 
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+   ← Revision 36 as of 2019-07-18 15:12:40 → ⇥
  Size: 2921
  Editor: KiwamuIzumi
  Comment:
-Deletions are marked like this.
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-Low phase noise, a center frequency of 70 MHz, actuation range of several 100 kHz, aaa dBm output
+Low phase noise, a center frequency of 80 MHz, actuation range of several 100 kHz, aaa dBm output
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+<<BR>>
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+----
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- .  {{attachment:7425_20181218132925_lnvcopn2.png|Measured freq. noise (klog 6552) | width=400}}
+=== Noise performance ===
 * Worse than the specification for the non-divided phase noise ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7425|klog 7425]]) at 1 and 10 kHz. See the table below.
 * Most of the RF components are not secured to the chassis in order to allow for the quick implementation. This may cause undesired acoustic coupling.
 .  {{attachment:7425_20181218132925_lnvcopn2.png|Measured freq. noise (klog 7425) | width=400}}
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+  ||<style="background-color: red;"> ''' Frequency [Hz] ''' ||<style="background-color: red;">  ''' Measured Frequency noise [Hz/Hz^1/2] ''' ||<style="background-color: red;"> ''' Equivalent Phase noise [dBc/Hz] ''' ||<style="background-color: red;"> '''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 ||
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+=== Tuning Range ===
 * Linear range of 0.8 to 2.8 V achieved ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=6544| klog 6544]], [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=6638|klog 6638]]). This is smaller than the expected range of 0-5 V.
 * Resulting frequency showed some kind of hops, limiting the linear range. No clear explanation exists at the moment.
 * Tuning sensitivity of 0.42 MHz/V is achieved ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=6544|klog 6544]]). This is consistent with the specification of ROS-102-919 whose sensitivity is 4.5 MHz/V typ.
 . {{attachment:6544_20181013071657_1.png| | width=300}} {{attachment:6544_20181013071708_2.png | | width=300}}

<<BR>>
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+----
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+ ||<style="background-color: red;"> '''Description''' ||<style="background-color: red;"> '''Part number '''||<style="background-color: red;"> ''' Manufacture''' ||<style="background-color: red;"> ''' Notes '''||<style="background-color: red;"> ''' Price/each '''||
 || Seed VCO  || ROS-102-191 (with eval.board TB-10)|| Minicicruits || center freq. 100 MHz|| ||
 || RF amp for VCO output || LNBA-0-13-BJ-100-15 || Wenzel || || ||
 || RF amp for LO || LNBA-10-23-AE-100-15 || Wenzel || +23 dBm output ||  ||
 || RF amp for the output signal|| LNBDA-2-26-AC-AE-100-15 || Wenzel ||+26 dBm output|| ||
 || Frequency divider || LNFD2-10-100-13-1-13-15 || Wenzel || factor of 10 || ||
 || Low noise Mixer || LNMX-X-X-X || Wenzel || no attenuation || ||