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A single barrier varactor quintupler at 170 GHz
A.V. Raisanen;T.J. Tolmunen;M. Natzic;M.A. Frerking;E. Brown;H. Gronqvist;S.M. Nilsen
InGaAs-InAlAs single-barrier varactor (SBV) diodes are tested as frequency quintuplers. The diodes were tested in a crossed-waveguide structure and provided output frequencies between 148 and 187 GHz. The highest observed flange-to-flange efficiency was 0.78% at an output frequency of 172 GHz. This is nearly four times greater than the best quintupler efficiency obtained for previous SBV varactors...Show More
Comments, with reply, on "Modeling of planar varactor frequency multiplier devices with blocking barriers" by U. Lieneweg et al
The commenter reports that he has conducted a series of measurements for determining the effective series resistance, capacitance, and RC time constant of the back-to-back connected diodes, which exhibit behavior of the effective series resistance and capacitance that is somewhat different than assumed in the commenter's thesis (UCLA, 1991) or published in the above-titled paper by V. Lieneweg et ...Show More
Quantum-well diode frequency multipliers: varistor case
Local oscillators for heterodyne receivers at submillimeter wavelengths are typically made using a fundamental source followed by a harmonic frequency multiplier. An investigation of the required circuit embedding conditions for a possible new harmonic generator, the quantum-well resonant-tunneling diode, is summarized. A low-frequency multiplier has been tested that employs the resistive nonlinea...Show More
Current saturation in submillimeter-wave varactors
In semiconductor devices the speed of electrons cannot exceed certain limits. This phenomenon will affect varactor multipliers as well as other high-frequency devices where the RF current through the active part of the device is primarily displacement current. Hence, at some point, 'saturation' of the varactor output power is expected. The authors discuss this phenomenon in some detail and show th...Show More
Modeling of planar varactor frequency multiplier devices with blocking barriers
Models for optimization of planar frequency triplers with symmetrical C-V curves are presented. The roles and and limitations of various blocking barriers (oxide, Mott, heterojunction) are discussed. Devices with undoped drift regions (BIN) gave moderate efficiency but a broad range of power generation, whereas the devices with doped drift regions (BNN) have high efficiency in a narrower power win...Show More
A theoretical study using a full nonlinear analysis has been carried out on the feasibility of producing local oscillator power at frequencies 300-600 GHz by using Schottky-diode frequency multipliers. Solid state local oscillators are needed for space born radiotelescopes planned for operation in the beginning of the next century. A comparison has been made between the efficiencies of higher-orde...Show More
Higher order frequency multipliers-a solution for MM- and subMM-wave local oscillator signal generation
IEEE MTT-S International Microwave Symposium Digest
Year: 1989 | Conference Paper |
Cited by: Papers (1)
A frequency quadrupler for 140 GHz and frequency doublers for 183 GHz and 230 GHz have been analyzed both theoretically and experimentally. The generation of a 345-GHz signal using a doubler, tripler, quadrupler, or two cascaded doublers and the generation of a 460-GHz signal using a doubler, quadrupler, or two cascaded doublers have been theoretically compared. It is found that if tube oscillator...
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Show MoreAnalysis and Design of 130-250 GHz Frequency Multipliers
1988 18th European Microwave Conference
Year: 1988 | Conference Paper |
In this research the feasibility of developing high efficiency mm-wave multipliers in the frequency range of 130-250 GBz has been studied. A frequency quadrupler for 140 GBz and frequency doublers for 183 GBz and 230 GBz have been analyzed and optimized. The development of high efficiency frequency multipliers is especially important for the spaceborne mm-wave and submm-wave heterodyne receivers u...Show More
Development of high efficiency frequency multipliers
1987 Twelth International Conference on Infrared and Millimeter Waves
Year: 1987 | Conference Paper |
A frequency multiplier combined with a fundamental solid state oscillator is an attractive choice for the local oscillator of a low noise mm- or submm-receiver in space applications. A Schottky diode in the varactor mode provides the best multiplier element up to 500 GHz and in the varistor mode from 500 to 800 GHz. At 100 GHz efficiencies as high as 45 % for a doubler and 28 % for a tripler have ...Show More
A Millimeter Wave Schottky-Varactor Doubler with a Wide Tunable Frequency Range
1986 16th European Microwave Conference
Year: 1986 | Conference Paper |
The efficiency of mm-wave doublers with a wide tunable frequency range was studied. The efficiency depends on the varactor parameters and the embedding impedances seen by the diode at fundamental and harmonic frequencies. Mm-wave doublers were simulated with a computer to find optimum embedding impedances for a given diode. A scaled model was constructed in order to search for optimum impedances f...Show More
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