## Frequency doubler

A non-linear device that efficiently produces an output that is twice the frequency of the signal applied to its input.

## Conversion loss

Conversion loss is a measure of the difference in power level between input signal F1, and output signal F2 expressed in dB.

## Harmonic outputs

F1 is input at frequency. F_{1}

F2 is desired output frequency (2 X F_{1})

F3 is harmonic output (3 X F_{1})

F4 is harmonic output (4 X F_{1})

The MCL Handbook specifies harmonic power output F1 as a measure of the output power level at frequency F1 relative to the power at F2. Similarly, harmonic output F3 is a measure of the relative power level of frequency F3 to F2. And harmonic output F4 is a measure of the relative power level at F4 to F2.

## RF input power level

The required RF power that must be applied to the input of the frequency doubler in order that the “doubling action” will be performed and is the power range for which conversion loss is specified. At low RF input levels, the conversion loss will increase beyond its specified maximum level. At high RF input levels, the frequency doubler can burn out.

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