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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
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 || '''Description''' || '''Part number '''|| ''' Manufacture''' || ''' Notes '''|| ''' Price/each '''||
 || Seed VCO || ROS-102-191 (with eval.board TB-10)|| Minicicruits || || ||
 || 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 || ||

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.

Bill of Materials

  • Description

    Part number

    Manufacture

    Notes

    Price/each

    Seed VCO

    ROS-102-191 (with eval.board TB-10)

    Minicicruits

    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

KAGRA/Subgroups/MIF/AEL/LowNoiseVCOs (last edited 2019-11-12 11:32:54 by KiwamuIzumi)