Accession Number : AD0654414

Title :   HARMONIC GENERATION IN THE VHF, UHF RANGES WITH P-N JUNCTION SEMICONDUCTOR DIODES (NONLINEAR CAPACITOR),

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : Walters,LeRoy

Report Date : 17 SEP 1959

Pagination or Media Count : 25

Abstract : The memos show that frequency multiplication by means of a nonlinear capacitor (varactor) gives conversion efficiencies considerably greater than those obtainable with ideal point-contact diodes (nonlinear resistance). The efficiency of a frequency multiplier employing ideal diodes is limited to 1/N to the 2nd power, where N is the harmonic number desired. A third order varactor frequency multiplier converted 180 Mc. at 18 milliwatts to 540 Mc. at 8.3 milliwatts for a conversion loss of 3.4 db; the loss is 9.5 db for an ideal diode. A 10 to 1 varactor frequency multiplier (100 Mc. to 1000 Mc.) gave a best conversion loss of 11.7 db as compared to the loss of 20 db for an ideal diode. This device has been successfully used as part of the instrumentation to make high resolution records of the frequency deviations between two Atomichrons and between an Atomichron and a Manson oscillator. (Author)

Descriptors :   (*HARMONIC GENERATORS, *VARACTOR DIODES), SEMICONDUCTOR DEVICES, FREQUENCY MULTIPLIERS, VERY HIGH FREQUENCY, ULTRAHIGH FREQUENCY, FREQUENCY CONVERTERS

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE