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![microstepper_block-diagram_2020-01](uploads/6dc1546eeb360d3f3732f4f2596fc798/microstepper_block-diagram_2020-01.png)
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This image shows a high-level block diagram of the microstepper. The colors indicates how functions are divided between the boards.
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Implementation
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This is a brief description of the current implementation in the prototype
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- Refence input stage and DDS1:
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- DDS1 from ARTIQ Urukul board
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- Reference input amplifier LMH6702 non-inverting G=2
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- IFB mixer ADE-1L
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- DDS1 divider MC12093 followed by LMH6702 non-inverting G=2
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- IFB mixer IF amplified by ADA4898-1 in non-inverting G=2 to phase-detector
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- IFB chain:
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- DDS2 from ARTIQ Urukul board
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- /4 divider MC12093 followed by LMH6702 in G=+2
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- /1024 divider 74AHC1G4210
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- IFB thru ADA4898-1 G=+2 to phase-detector
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- Phase detector AD630
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- OCXO board
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- PD input thru PID-controller built with OPA188
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- OCXO ConnorWinfield OH300
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- /10 output-divider MC12080
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- output-amplifiers LMH6702 G=+2
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Frequency resolution
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This is a basic derivation of the frequency-resolution of the microstepper. This assumes a 100 MHz reference-frequency (from maser), and a 100 MHz OCXO frequency. Other configurations are certainly possible and could be explored.
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