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

Claim 9:
10. 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 of the negative resistance network over a frequency band including F0;
a circulator comprising at least three ports, the at least three ports comprising an input port, an output port, and a control port, wherein an impedance connected to the control port determines a gain of the amplifier;
a physical resistor or combination of physical resistors with one end connected to the control port of the circulator and the other end connected to a reactance network, wherein a value of the resistor or combination of physical resistors influences a bandwidth of the amplifier;
the reactance network connected between the physical resistor or combination of physical resistors and the output terminals of the negative resistance network, wherein the reactance network is configured to be resonant at F0; and
wherein the reactance network is configured such that a signal at the input of the circulator will be amplified at the output port of the circulator over a very narrow band of frequencies centered at F0.