US PATENT SUBCLASS 331 / 132
NEGATIVE RESISTANCE OR NEGATIVE TRANSCONDUCTANCE OSCILLATOR


Current as of: June, 1999
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331 /   HD   OSCILLATORS

132NEGATIVE RESISTANCE OR NEGATIVE TRANSCONDUCTANCE OSCILLATOR {2}
133  DF  .~> Secondary emission (e.g., dynatron)
134  DF  .~> Transitron type


DEFINITION

Classification: 331/132

(under the class definition) Oscillators wherein the oscillator comprises a two-terminal negative resistance device connected to a tuned circuit, the absolute magnitude of the negative resistance being less than the resonant impedance of the tuned circuit.

(1) Note. A negative resistance is a two-terminal device having a volt-ampere characteristic with negative slope over the range of voltages or currents wherein it is operative, that is, an increase in voltage results in a decrease in current, or vice versa. The term "negative resistance" as employed herein comprehends devices designated as the "negative transconductance" type.

SEE OR SEARCH THIS CLASS, SUBCLASS:

86+, for magnetron oscillators which may be of the negative resistance type.

115, for negative resistance type oscillators of the transistor type.

126+, for oscillators of gaseous space discharge type which may be of the negative resistance type.

SEE OR SEARCH CLASS 333, Wave Transmission Lines and Networks,

213+, for negative resistance device systems, per se.