Open AccessAnalysis on high frequency performance of THz GaAs Schottky mixer diode
Author(s) -
Guoli Fan,
Yuesong Jiang,
Liu Li,
Fang Li
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.5374
Subject(s) - materials science , optoelectronics , terahertz radiation , schottky diode , diode , figure of merit , capacitance , frequency multiplier , substrate (aquarium) , doping , varicap , physics , electrode , oceanography , cmos , quantum mechanics , geology
In the THz frequency range,several new high effects will restrict diode high-frequency performance. With the thermionic emission theory and the tunnel theory,the high-frequency performance of epitaxial Schottky diodes is re-evaluated and the structure parameters are optimized with using the cut-off frequency as a figure of merit. The results show that when the operation frequency is higher than the plasma frequency,the diode is equivalent to a capacitance with losing the frequency mixing performance. With the increase of frequency,increasing the doping density of substrate can reduce the substrate plasma resonance effect. The plasma resonance frequency of epitaxial layer is an important factor but transit time effect must be considered. The higher operation frequency can be obtained through reducing the anode diameter and the epilayer thickness,and increasing the epilayer doping density. The results have an important reference value in developing the room temperature THz mixing diodes.