US 2012/0075017 A1 · ATTENUATOR

Abstract

An attenuator includes a first 3 dB bridge, a second 3 dB bridge and an amplifying tube group, where the amplifying tube group includes a first amplifying tube and a second amplifying tube, a drain of the first amplifying tube is connected to a first output port of the first 3 dB bridge, a source of the first amplifying tube is connected to a first input port of the second 3 dB bridge, a drain of the second amplifying tube is connected to a second output port of the first 3 dB bridge, and a source of the second amplifying tube is connected to a second input port of the second 3 dB bridge; where gates of the first amplifying tube and the second amplifying tube are respectively connected to the same voltage source or different voltage sources having the same voltage.

Claims25

Dependent claims

An attenuator, comprising a first 3 dB bridge, a second 3 dB bridge and an amplifying tube group, wherein the amplifying tube group comprises a first amplifying tube and a second amplifying tube, a drain of the first amplifying tube is connected to a first output port of the first 3 dB bridge, a source of the first amplifying tube is connected to a first input port of the second 3 dB bridge, a drain of the second amplifying tube is connected to a second output port of the first 3 dB bridge, and a source of the second amplifying tube is connected to a second input port of the second 3 dB bridge;

wherein the first 3 dB bridge and the second 3 dB bridge are respectively disposed with an isolating resistor used for absorbing power;
and
gates of the first amplifying tube and the second amplifying tube are respectively connected to the same voltage source or different voltage sources having the same voltage.

A variable gain amplifier, comprising an attenuator, a first amplifier and a second amplifier,

the attenuator comprises a first 3 dB bridge, a second 3 dB bridge and an amplifying tube group, wherein the amplifying tube group comprises a first amplifying tube and a second amplifying tube, a drain of the first amplifying tube is connected to a first output port of the first 3 dB bridge, a source of the first amplifying tube is connected to a first input port of the second 3 dB bridge, a drain of the second amplifying tube is connected to a second output port of the first 3 dB bridge, and a source of the second amplifying tube is connected to a second input port of the second 3 dB bridge;
wherein the first 3 dB bridge and the second 3 dB bridge are respectively disposed with an isolating resistor used for absorbing power;
and
gates of the first amplifying tube and the second amplifying tube are respectively connected to the same voltage source or different voltage sources having the same voltage;
and wherein an input port of the first amplifier is connected to the source of the first amplifying tube of the attenuator, an output port of the first amplifier is connected to the first input port of the second 3 dB bridge of the attenuator, an input port of the second amplifier is connected to the source of the second amplifying tube of the attenuator, and an output port of the second amplifier is connected to the second input port of the second 3 dB bridge of the attenuator.

2 more elements

A communication device, comprising an attenuator and an amplifier,

the attenuator comprises a first 3 dB bridge, a second 3 dB bridge and an amplifying tube group, wherein the amplifying tube group comprises a first amplifying tube and a second amplifying tube, a drain of the first amplifying tube is connected to a first output port of the first 3 dB bridge, a source of the first amplifying tube is connected to a first input port of the second 3 dB bridge, a drain of the second amplifying tube is connected to a second output port of the first 3 dB bridge, and a source of the second amplifying tube is connected to a second input port of the second 3 dB bridge;
wherein the first 3 dB bridge and the second 3 dB bridge are respectively disposed with an isolating resistor used for absorbing power;
and
gates of the first amplifying tube and the second amplifying tube are respectively connected to the same voltage source or different voltage sources having the same voltage;
and wherein the amplifier is configured to amplify signals output by the attenuator.

2 more elements

Dependencies are inferred from the claim text.

Attenuator

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Attenuator

Life of this patent

Abstract

Claims25