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The phase locker IOC provides the controls to interface with the phase locker firmware. The latter takes at its inputs a VCO-controlled RF signal and an RF-reference signal of the same frequency. Subsequently, the computed phase error between the two signals is used to estimate a correction voltage, which in turn gets applied to the VCO to tune the VCO-generated signal. This is repeated until the two signals are locked together in phase within an acceptable margin.
Firmware
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Description
The diagram below sheds more light in the process outlined above.
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Overview
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