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).

• Tuning sensitivity of 0.42 MHz/V is achieved.

• 

Endeavour model

• Sophisticated version of the prototype model.

Bill of Materials