Wave transmission lines and networks – Negative resistance or reactance networks of the active type – Simulating specific type of reactance
Patent
1996-01-31
1998-03-10
Gensler, Paul
Wave transmission lines and networks
Negative resistance or reactance networks of the active type
Simulating specific type of reactance
333217, H03H 1148
Patent
active
057266131
ABSTRACT:
An active inductor having a greater inductance, low loss, and which is small is provided by the present invention. The active inductor comprises a common source FET and a cascode-connected common gate FET connected thereto for providing unidirectional feedback. The drain electrode of the front FET and the source electrode of the rear FET, consisting of the common gate cascode FET, are connected together. A resistor is connected at one end to this connection. The two terminals of the active inductor correspond to the other end of the resistor and the source electrode of the common source FET. A frequency independent negative resistance is generated in series with the inductance by this configuration. By properly tuning the resistance of the resistor, it is possible to make the impedance viewed from the two terminals to have inductance component only, and therefore an active inductor having less resistance loss is obtained.
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Hayashi Hitoshi
Muraguchi Masahiro
Nakatsugawa Masashi
Gensler Paul
Nippon Telegraph and Telephone Corporation
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