Analog multiplier

The F — V input frequency is locked to the V — F output because the LTClG43's clock is common to both sections. The F — V's reference is used as one input of the multiplier, while the V — F furnishes the other.
Analog multiplier  - schematic

To calibrate, short the X and Y inputs to 1.7320 V and trim for a 3-V output.

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