Abstract
Abstract A frequency multiplier using an ‘ ideal ’ non-linear capacitance, which may be approximated by a charge storage diode, is examined for the case where both the input and output circuits are tuned and where a finite resistance exists in series with the diode. After stating the problem in general terms, the case of a frequency doubler is examined and curves are given which relate the different circuit parameters and the drive conditions to the conversion efficiency and the output power. It is shown that high efficiencies (e.g. −2 dB) may be obtained and that the converted power is considerably greater than for a varactor with the same bias voltage and total series resistance. The theory is verified experimentally with a 3 Mc/6 Mc doubler and correlation with the theory is found to be good.
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