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| * Linear range of 0.8 to 2.8 V achieved ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=6638|klog 6638]]). * Tuning sensitivity of 0.42 MHz/V is achieved. |
* Linear range of 0.8 to 2.8 V achieved ([[http://klog.icrr.u-tokyo.ac.jp/osl/?r=6638|klog 6638]]). This is smaller than the expected range of 0-5 V. * Tuning sensitivity of 0.42 MHz/V is achieved. This is consistent with the specification of ROS-102-919 whose sensitivity is 4.5 MHz/V typ. |
Low Noise VCOs
Descriptions
Low phase noise, a center frequency of 70 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 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 6638). This is smaller than the expected range of 0-5 V.
- Tuning sensitivity of 0.42 MHz/V is achieved. 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.