Stability criterion for Gunn diodes with injection-limiting cathodes

Author

Zetsche, Hartmut

Author_Institution

Institut für Angewandte Festkörperphysik der Fraunhofer-Gesellschaft, Freiburg i. Br., Germany

Volume

Issue

fYear

1974

fDate

2/1/1974 12:00:00 AM

Firstpage

142

Lastpage

146

Abstract

According to McCumber [1] a Gunn diode with an ohmic cathode (i.e., "differential cathode conductivity" $\\sigma _{c} = \\delta$ ) is stable in a constant-voltage circuit if $n_{0}L \\le (n_{0}L)_{crit} \\equiv 2.7 \\times 10^{11}$ cm^-2where $n_{0}L$ is the doping-length product. We show that the same stability criterion applies to Gunn diodes with an injection-limiting cathode $(\\sigma _{c} \\rightarrow 0)$ , if $(n_{0}L)_{crit}$ is allowed to be a function of $\\sigma _{c}L$ . The value of $(n_{0}L)_{crit}$ increases by 30 percent if $(\\sigma _{c}L)$ varies from infinity (ohmic cathode) to zero (injection-limiting cathode). If a cathode with negative differential conductivity is realizable, it may be possible to extend the $(n_{0}L)$ region of stable operation of Gunn diodes drastically.

Keywords

Cathodes; Circuit stability; Conductivity; Current density; Diodes; Electron mobility; Frequency; Gunn devices; Poisson equations; Stability criteria;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/T-ED.1974.17883

Filename

1477698

Link To Document

https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1047307