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| == Descriptions == Low phase noise, a center frequency of 70 MHz, actuation range of several 100 kHz, aaa dBm output |
= Descriptions = Low phase noise, a center frequency of 80 MHz, actuation range of several 100 kHz, aaa dBm output |
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| == Endeavour model == . Designed by Y. Enomoto (2018), inspired by LIGO low noise VCOs. |
<<BR>> = Prototype model = ---- |
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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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| == Production model == . Sophisticated version of the endeavour model. |
=== 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}} ||<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>> = Endeavour 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. == Bill of Materials == ||<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 || || || 1U Chassis for RF || JGW-D1706470-v1 || AEL || || || || Aluminum plates for heat sink || || || needs to be designed || || || Low noise power unit for RF || || || || || || Ceramic capacitors for noise reduction || || || || || || SMA barrel connectors || || || || || || SMA right angle connectors || || || || || |
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), inspired by LIGO low noise VCOs. JGW-D1808968
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.
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.
- Determination of whether ROS-102-191 meets the specification in phase noise.
- Identification of where the dominant noise sources are.
- Identification of where the frequency hop comes from.
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
1U Chassis for RF
JGW-D1706470-v1
AEL
Aluminum plates for heat sink
needs to be designed
Low noise power unit for RF
Ceramic capacitors for noise reduction
SMA barrel connectors
SMA right angle connectors