Differences between revisions 12 and 53 (spanning 41 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

Designed by Y. Enomoto (2018), aiming at quick implementation, inspired by LIGO low noise VCOs. JGW-D1808968
One unit costed 370,000 JPY. A rough estimation of the cost can be found in the attached spread sheet.

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.
The below is a list of the things that need to be evaluated before building it.
1. Determination of whether ROS-102-191 meets the data sheet values in phase noise.
2. Identification of where the dominant noise sources are.
3. Identification of where the frequency hop comes from.
4. Estimate the impact of thermal fluctuation through the push in VCO.

Bill of Materials

Description	Part number	Manufacture	Notes	Price/each	Quantities	Total Price	Procurement/Preparation Status
Seed VCO	ROS-102-191 (with eval.board TB-10)	Minicicruits	center freq. 100 MHz	19,400 JPY	3		Asking Minicricuit Yokohama (2019/Jul/18; KI)
RF amp for VCO output	LNBA-0-13-BJ-100-15	Wenzel					Quote being made (2019/Jul/18; KI)
RF amp for LO	LNBA-10-23-AE-100-15	Wenzel	+23 dBm output				Quote being made (2019/Jul/18; KI)
RF amp for the output signal	LNBDA-2-26-AC-AE-100-15	Wenzel	+26 dBm output				Quote being made (2019/Jul/18; KI)
Frequency divider	LNFD2-10-100-13-1-13-15	Wenzel	factor of 10				Quote being made (2019/Jul/18; KI)
Low noise Mixer	LNMX-X-X-X	Wenzel	no attenuation				Quote being made (2019/Jul/18; KI)
1U Chassis for RF	JGW-D1706470-v1	AEL					AEL has several (2019/Jul/18)
Narrow band pass filter	MC80-10-4AA	Lark Engineering	80 MHz		1		-
Aluminum plates for heat sink			needs to be designed				-
Low noise power unit for RF							-
Ceramic capacitors for noise reduction	RCE5C1H103J1K1H03B	Murata	10 nF	5
SMA barrel connectors
SMA right angle connectors

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

-  ⇤ ← Revision 12 as of 2019-07-17 16:15:03 → 
  Size: 531
  Editor: KiwamuIzumi
  Comment:
+   ← Revision 53 as of 2019-07-19 11:02:38 → ⇥
  Size: 4465
  Editor: KiwamuIzumi
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 4:
-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
 Line 6:
+<<BR>>
-Line 7:
+Line 8:
- * 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]]
+----
-Line 9:
+Line 10:
- .  {{attachment:7425_20181218132925_lnvcopn2.pn|Measured freq. noise (klog 6552) | width=400}}
+ * Designed by Y. Enomoto (2018), aiming at quick implementation, inspired by LIGO low noise VCOs. [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8968| JGW-D1808968]]
 * One unit costed 370,000 JPY. A rough estimation of the cost can be found in the attached [[attachment:VCO_parts_prices.xlsx| spread sheet]].
-Line 11:
+Line 13:
+=== 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}}
-Line 12:
+Line 18:
+  ||<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 ||

=== 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>>
-Line 13:
+Line 36:
- . Sophisticated version of the prototype model.
+----
 * Sophisticated version of the prototype model.
 * The below is a list of the things that need to be evaluated before building it.
  i. Determination of whether ROS-102-191 meets the data sheet values in phase noise.
  i. Identification of where the dominant noise sources are.
  i. Identification of where the frequency hop comes from.
  i. Estimate the impact of thermal fluctuation through the push in VCO.
-Line 17:
+Line 46:
+ ||<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 '''||<style="background-color: red;"> ''' Quantities '''||<style="background-color: red;"> ''' Total Price''' ||<style="background-color: red;"> ''' Procurement/Preparation Status '''||
 || Seed VCO  || ROS-102-191 (with eval.board TB-10)|| Minicicruits || center freq. 100 MHz||19,400 JPY || 3 || || Asking Minicricuit Yokohama (2019/Jul/18; KI) ||
 || RF amp for VCO output || LNBA-0-13-BJ-100-15 || Wenzel || || || || || Quote being made (2019/Jul/18; KI)||
 || RF amp for LO || LNBA-10-23-AE-100-15 || Wenzel || +23 dBm output ||  || || || Quote being made (2019/Jul/18; KI)||
 || RF amp for the output signal|| LNBDA-2-26-AC-AE-100-15 || Wenzel ||+26 dBm output|| || || || Quote being made (2019/Jul/18; KI) ||
 || Frequency divider || LNFD2-10-100-13-1-13-15 || Wenzel || factor of 10 || || || || Quote being made (2019/Jul/18; KI) ||
 || Low noise Mixer || LNMX-X-X-X || Wenzel || no attenuation || || || || Quote being made (2019/Jul/18; KI) ||
 || 1U Chassis for RF  || JGW-D1706470-v1 || AEL || || || || || AEL has several (2019/Jul/18) ||
 || Narrow band pass filter || MC80-10-4AA || Lark Engineering || 80 MHz || || 1 || ||  - ||
 || Aluminum plates for heat sink || || || needs to be designed || || || || - ||
 || Low noise power unit for RF || || ||  || || || || - ||
 || Ceramic capacitors for noise reduction || RCE5C1H103J1K1H03B || Murata|| 10 nF || 5|| || || ||
 || SMA barrel connectors || || || || || || || ||
 || SMA right angle connectors || || || || ||