Size: 1312
Comment:
|
Size: 2040
Comment:
|
Deletions are marked like this. | Additions are marked like this. |
Line 4: | 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 13: | Line 13: |
* 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. |
* 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 28: | 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}} |
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.