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US 7,612,616 B2Granted
Low-noise amplifier
AssigneeNational Taiwan University
InventorsPing-Yuan Deng, Jean-Fu Kiang
Life of this patent
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Abstract
A low-noise amplifier is provided according to the present invention. The low-noise amplifier includes a first amplifier stage, a second amplifier stage, a third amplifier stage, an input matching network, inter-stage matching networks, and an output matching network. The impedance of the input matching network and the input impedance of the first amplifier stage are conjugate matched, thereby decreasing system power consumption and noise factor. The system gain is enhanced by cascading three stages of amplifiers.
Claims12
A low-noise amplifier comprising:
- an input matching network;
- a first amplifier stage having an input end and an output end, the input end being connected to the input matching network, the first amplifier stage having an input impedance in conjugate matching relation with the impedance of the input matching network;
- a second amplifier stage having an input end and an output end;
- a first inter-stage matching network connected to the output end of the first amplifier stage and the input end of the second amplifier stage, to form a conjugate matching relation between the output impedance of the first amplifier stage and the input impedance of the second amplifier stage;
- a third amplifier stage having an input end and an output end;
- a second inter-stage matching network connected to the output end of the second amplifier stage and the input end of the third amplifier stage, to form a conjugate matching relation between the output impedance of the second amplifier stage and the input impedance of the third amplifier stage;
- and
- an output matching network connected to the output end of the third amplifier stage.
5 more elements
Dependencies are inferred from the claim text.