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US 11,863,131 B1Granted
Very narrowband and wideband negative resistance amplifiers with a tuneable center frequency
OwnerAlfred Ira Grayzelinventor
Life of this patent
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Abstract
A negative resistance amplifier including a negative resistance network where the negative resistance network may be any known circuit element characterized by a negative ratio of the voltage a between its output terminals and to the current flowing through the element: a reactance network resonant at the center frequency of the amplifier where the reactive network may contain a varactor for tuning of the resonant frequency of the reactance network: and a circulator whose port 1 is the input terminal of the amplifier, whose port 3 is the output port of the amplifier and whose port 2 is connected to the combination of the negative resistance network and the reactance network.
Claims20
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.
3 more elements
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.
3 more elements
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.
3 more elements
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 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;
- and
- a circulator comprising at least three ports, wherein:
- the at least three ports including an input port, an output port, and a control port,
- 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, and
- the amplifier is configured to vary F0 by varying the voltage supplied by the bias network while a gain of the amplifier remains constant without adjusting the value of the negative resistance or any other bias.
5 more elements
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.
4 more elements
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 over a frequency band including F0;
- a reactance network whose resonant frequency can be varied by means of a DC voltage;
- a bias network configured to present a 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 the circulator and the other end connected to ground;
- 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, where F0 can be varied by varying the voltage supplied by the bias network.
4 more elements
Dependencies are inferred from the claim text.