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 . 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 specification 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.
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 ||<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 || || ||		  ||<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|| ||
Line 47: Line 52:
 || 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 || || || || ||
 

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.

  • 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.

  • 6544_20181013071657_1.png 6544_20181013071708_2.png


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 specification 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

    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)