Ridley Watkins Hilsum theory

According to the Ridley Watkins Hilsum (RWH) Theory the differential negative resistance that is developed in a bulk solid state III - V compound when either a voltage or a current is applied to the terminals of the sample.

There are two modes of negative resistance devices:

1. Voltage-controlled modes. 2. current-controlled modes.

In the voltage controlled mode the current density can be multivalued, whereas in the current controlled mode the voltage can be multivalued. In 1964 Kroemer suggested that Gunn's observations were in complete agreement with the RWH.

Theinitially homogeneous sample becomes electrically hetrogeneous in an attempt to reach stability. It is mathematically expressed as dI/dV = dJ/dE = negative resistance

See also

Gunn diode

References

* cite book
last = Liao
first = Samual Y
title = MICROWAVE DEVICES and CIRCUITS 3rd edition
publisher = Prentice Hall
year = 1990
isbn = 0135832047

* Citation
last1= Kroemer
first1=H
title= Theory of the Gunn effect
publisher=IEEE
contribution-url=http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1445406
year=1964
volume=52
issue=12
place=Proceedings of the IEEE
pages=1736-1736
ISSN=0018-9219
date=December 1964

* Citation
last1= Averkov
first1= Y.O.
title= The role of the Ridley-Watkins-Hilsum effect in stabilization ofmillimeter and sub-millimeter surface electromagnetic waves excited byan electron beam moving parallel to the surface of GaAs
publisher=IEEE
contribution-url=http://ieeexplore.ieee.org/Xplore/login.jsp?url=/iel5/7530/20496/00946832.pdf
year=2001
volume=1
issue=2001
place=The Fourth International Kharkov Symposium onPhysics and Engineering of Millimeter and Sub-Millimeter Waves
pages=299-301
DOI=10.1109/MSMW.2001.946832
date=June 2001

* Citation
last1= Sterzer
first1= F
title= Transferred electron (Gunn) amplifiers and oscillators for microwave applications
publisher=IEEE
url=http://ieeexplore.ieee.org/Xplore/login.jsp?url=/iel5/5/31147/01450291.pdf
year=1971
volume=59
issue=8
pages=1155-1163
date=August 1971

* Citation
last1= Agamalyan
first1= N. R.
last2=Vartanyan
first2=E. S.
last3=Hovsepyan
first3=R. K.
title= Photoelectric properties of lead molybdate crystals
publisher=WILEY-VCH Verlag GmbH & Co. KGaA
contribution-url=http://www3.interscience.wiley.com/cgi-bin/abstract/112446804/ABSTRACT?CRETRY=1&SRETRY=0
year=1996
volume=157
issue=2
place=Institute for Physical Research, Armenian Academy of Sciences, Ashtarak
pages=421-425
DOI=10.1002/pssa.2211570226
date=1 February 1996

* [http://www.geocities.com/semnews/milestones.html Milestones in Semiconductor Science and Technology, 1961]