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Grig, imagine a mains power supply, with a center tapped transformer and two diodes, anode of diodes go to the two transformer points, center point of transformer grounded, and the output is the connected cathode points of the diodes. Sometime it is called a full wave rectifier.
If you want to design a high linearity frequency doubler you need a high linearity multiplier.
If you feed both inputs of the multiplier with the signal cos(ωt), at the output you get a signal with double frequency and a DC component.
I have such basic, but may be you have some reference about design isue of high linear multiplier (wide bandwidth and optimized in the reason of power consumption)?
If you refer to a typical double balanced mixer circuit. Replace the ring quad with a bridge quad. The LO port become the input, the RF port becomes the output. The IF becomes shorted or terminated.
Operation is equal to that of a full-wave bridge rectifier except you don't remove the AC with a filter cap.
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