Patent ID: 11863131
Assignee: nan
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. An amplifier comprising:
a negative resistance network comprising a network characterized by a negative ratio of a voltage between output terminals of the negative resistance network and to a current flowing into the output terminals negative resistance network over a frequency band including F0;
a reactance network whose resonant frequency is configured to be varied by means of a DC voltage;
a bias network configured to present the DC voltage to the reactance network to vary the resonant frequency;
a circulator comprising at least three ports;
a physical resistor or combination of physical resistors with one end connected to a control port of a circulator and the other end connected to the reactance network; and
wherein a signal at an input port of the circulator will be amplified at an output port of the circulator over a very narrow band of frequencies centered at F0, wherein the amplifier is configured to vary F0 by varying the voltage supplied by the bias network.