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A Self-Biased Anti-parallel Planar Varactor Diode

Authors:
Neal R. Erickson
Abstract:
A set of design criteria are presented which are required of varactor diodes for use in practical wideband circuits. These include: high power handling, low in-circuit Q, tolerance to input power variations and reasonably high real impedance. To better meet these criteria, a modified planar varactor diode is proposed, in which the varactor junction is dc isolated from the circuit so that it will self-bias to the correct operating point. The required structure may be made as a simple modification to a conventional planar varactor, by replacing the ohmic contact with a Schottky contact. This diode is ideally suited for anti-parallel operation in tripler circuits. The behavior of the diode in a wideband circuit is discussed, as well as various means to characterize devices which can not be measured at dc.
Categories:
Varactors
Year:
1995
Session:
7
Full-text:
Download a PDF of this paper.
Page Number(s):
356-364