Low noise amplifier
AssigneeNXP B.V.
InventorOlivier Crand
Life of this patent
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Abstract
The present invention relates to a low noise amplifier comprising a transformer, a first amplifier and a feedback resistor, the transformer comprising a primary stage and a secondary stage. The secondary stage is connected to the input of the first amplifier and the output of the first amplifier is connected in series with a feedback resistor and the primary stage of said transformer.
Claims20
A low noise amplifier comprising a transformer, a first amplifier and a resistive element, the transformer comprising a primary stage and a secondary stage, wherein the secondary stage is connected to the input of the first amplifier and the output of the first amplifier is connected by way of a feedback connection employing the resistive element to the primary stage of said transformer, the output of the first amplifier providing the only feedback to the primary stage of the transformer;
- and a second amplifier connected to and in series with the secondary stage of the transformer and first amplifier.
A low noise amplifier comprising a transformer, a first amplifier having a high input impedance, and a resistive element, the transformer comprising a primary stage and a secondary stage, wherein the secondary stage is connected to the input of the first amplifier and the output of the first amplifier is connected by way of a feedback connection employing the resistive element to the primary stage of said transformer, the output of the first amplifier providing the only feedback to the primary stage of the transformer.
A low noise amplifier comprising a transformer, a first amplifier and a resistive element, the transformer comprising a primary stage and a secondary stage, wherein the secondary stage is connected to the input of the first amplifier and the output of the first amplifier is connected by way of a feedback connection employing the resistive element to the primary stage of said transformer, the output of the first amplifier providing the only feedback to the primary stage of the transformer, and a mid-point of the secondary stage of the transformer is connected to ground.
A low noise amplifier comprising:
- an amplifier circuit having an asymmetrical output and having a first amplifier;
- an input transformer having a primary stage and a secondary stage, a first terminal of the secondary stage of the transformer coupled to an input of the first amplifier and a second terminal of the secondary stage of the transformer coupled to a ground voltage;
- and
- a resistive element, the asymmetrical output of the first amplifier coupled by way of a feedback connection employing the resistive element to a first end of the primary stage of the transformer, and a second end of the primary stage of the transformer coupled to the ground voltage, the asymmetrical output providing the only feedback to the primary stage of the transformer;
- and
- a second amplifier connected to and in series with the secondary stage of the transformer and first amplifier.
Dependencies are inferred from the claim text.