Differences between revisions 20 and 41 (spanning 21 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.
Things need to be evaluated before building it.
1. Determination of whether ROS-102-191 meets the specification in phase noise.
2. Identification of where the dominant noise sources are.
3. Identification of where the frequency hop comes from.

Bill of Materials

Description	Part number	Manufacture	Notes	Price/each	Quantities
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
1U Chassis for RF	JGW-D1706470-v1	AEL
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 20 as of 2019-07-18 09:22:02 → 
  Size: 1109
  Editor: KiwamuIzumi
  Comment:
+   ← Revision 41 as of 2019-07-18 15:49:41 → ⇥
  Size: 3678
  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 12:
-=== Frequency Noise ===
 * Worse than the specification for the non-divided phase noise ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=7425|klog 7425]]).
+=== 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.
-Line 16:
+Line 17:
-  || ''' Frequency [Hz] ''' ||  ''' Measured Frequency noise [Hz/Hz^1/2] ''' ||  ''' Equivalent Phase noise [dBc/Hz] ''' || '''ROS-109-919 spec [dBc/Hz]'''||
+  ||<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]'''||
-Line 18:
+Line 19:
-  || 0.1  || 4 || || -- ||
  || 1 ||  0.1 || || -- ||
  || 10 || 0.05 ||  || -- ||
  || 100 || 0.05 ||  || -- ||
  || 1,000 || 0.05 || || -- ||
  || 10,000 || 0.03 || || -- ||
+  || 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 ||
-Line 26:
+Line 28:
+ * 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}}
-Line 31:
+Line 36:
- . Sophisticated version of the prototype model.
+ * Sophisticated version of the prototype model.
 * Things need to be evaluated before building it.
  i. Determination of whether ROS-102-191 meets the specification in phase noise.
  i. Identification of where the dominant noise sources are.
  i. Identification of where the frequency hop comes from.
-Line 35:
+Line 44:
+ ||<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 '''||
 || 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 || ||
 || 1U Chassis for RF  || JGW-D1706470-v1 || AEL || || ||
 || 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 || || || || ||