Frequency multiplier

Frequency multiplier - an electric or electronic device in which when applying oscillations with a period to the input $2\cdot \pi /\omega _{\text{BX}}$ ${\ displaystyle 2 \ cdot \ pi / \ omega _ {\ text {BX}}}$ ${\ displaystyle 2 \ cdot \ pi / \ omega _ {\ text {BX}}}$ oscillations with a period are formed at the output $2\cdot \pi /N\cdot \omega _{\text{BX}}$ ${\ displaystyle 2 \ cdot \ pi / N \ cdot \ omega _ {\ text {BX}}}$ ${\ displaystyle 2 \ cdot \ pi / N \ cdot \ omega _ {\ text {BX}}}$ .

Multipliers are used for:

Transfer of quartz frequencies (<100 MHz) to the microwave range;
Synthesizing a frequency grid;
Frequency stability measurements.

In radio transmitting devices, using multipliers, it is possible:

Lower the frequency of the master oscillator, which increases stability;
To expand the tuning range of the radio transmitter with a smaller tuning range of the master oscillator;
To increase the stability of the radio transmitting device due to the weakening of the feedback, since in the frequency multiplier the input and output circuits are tuned to different frequencies;
Increase the absolute deviation of the frequency or phase during frequency or phase modulation .

Comparison of the frequency multiplier and power amplifier for energy parameters

Parameter Name	Amplifier	Frequency multiplier
output power	${P_{1}}$ ${\ displaystyle {P_ {1}}}$	$P_{N}\approx P_{1}/N$ ${\ displaystyle P_ {N} \ approx P_ {1} / N}$
Electronic efficiency	${\text{K}}\Pi {\text{D}}_{\text{E1}}$ ${\ displaystyle {\ text {K}} \ Pi {\ text {D}} _ {\ text {E1}}}$	${\text{K}}\Pi {\text{D}}_{\text{EN}}\approx 0.8\cdot {\text{K}}\Pi {\text{D}}_{\text{E1}}$ ${\ displaystyle {\ text {K}} \ Pi {\ text {D}} _ {\ text {EN}} \ approx 0.8 \ cdot {\ text {K}} \ Pi {\ text {D}} _ { \ text {E1}}}$
Load resistance	$R_{H1}$ ${\ displaystyle R_ {H1}}$	$R_{HN}\approx R_{H1}\cdot N$ ${\ displaystyle R_ {HN} \ approx R_ {H1} \ cdot N}$
Input signal	$U_{1}$ ${\ displaystyle U_ {1}}$	$U_{N}\approx 0.46\cdot N^{2}\cdot U_{1}$ ${\ displaystyle U_ {N} \ approx 0.46 \ cdot N ^ {2} \ cdot U_ {1}}$
Power gain	$K_{P1}$ ${\ displaystyle K_ {P1}}$	$K_{PN}\approx 1.23\cdot K_{P1}/N^{2}$ ${\ displaystyle K_ {PN} \ approx 1.23 \ cdot K_ {P1} / N ^ {2}}$

It can be seen from the table that the energy indicators deteriorate with increasing N, therefore, UF is usually used at a low power level and with N <4.

Frequency multiplier

Comparison of the frequency multiplier and power amplifier for energy parameters

See also

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