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

Claim 0:
1. 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 including 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 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 the input port of the circulator will be amplified at the output port of the circulator over a very narrow band of frequencies centered at F0, and
the reactance network does not include an inverter means that matches the impedance of the negative resistance network to that of the circulator.