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

Claim 11:
12. 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 ground, wherein a value of the physical resistor or combination of physical resistors influences a bandwidth of the amplifier;
a reactance network connected between the control port of the circulator 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 input of the circulator will be amplified at the output of the circulator over a very narrow band of frequencies centered at F0.