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Quantum Well Multipliers: Triplers and Quintuplers

Authors:
M.A. Frerking
Abstract:
Quantum well devices are a promising new type of non-linear device for harmonic generation in the millimeter and submillimeter wave regime. Two types of non-linear impedances have been employed for harmonic generation: the varactor with a non-linear capacitance-voltage characteristic and the varistor with a non-linear current-voltage (I-V) relationship. The harmonic generation efficiency of the varactor theoretically exceeds that for a varistor since an ideal varactor suffers no resistive losses. However, above about 400 GHz, currently available varistors are more efficient because they have considerably higher cutoff frequencies. The maximum conversion efficiency to the nth harmonic for an ideal varistor with a monotonically increasing I-V characteristic has been shown to be 1/n². The quantum well double barrier diode is a varistor which exhibits a negative resistance in its I-V curve at frequencies as high as 2.5 THz. Since its I-V curve is no longer monotonically increasing, it can generate harmonics with higher efficiency than the 1/n² limit. Tripling to 200 GHz has been demonstrated with these devices with output powers in excess of 200µW. The capacitance - voltage characteristic of these devices is also highly non-linear and may provide efficient varactor operation. Theoretical analysis yields high efficiencies for tripling and quintupling of GaAs/AlAs and InGaAs/AlAs quantum well devices with optimized embedding impedances.
Categories:
Mixers, Multipliers
Year:
1990
Session:
3
Full-text:
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Page Number(s):
319-342