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US 11,888,453 B2Granted
Wideband low-noise amplifier
AssigneeQUALCOMM Incorporated
InventorsAlaaeldien Mohamed Abdelrazek Medra, Francesco Gatta
Life of this patent
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Abstract
A wideband amplifier includes a first stage and a second stage. The first stage includes a transconductance transistor driven by an input signal through an input transformer. The transconductance transistor couples to a cascode transistor forming an output node for the first stage. The second stage couples the output node from the first stage through an output transformer to drive an output transistor.
Claims30
An amplifier, comprising:
- an input transformer including a first coil, a second coil, and a third coil, the second coil being coupled to an input node configured to receive an input signal;
- a first transconductance transistor having a gate coupled to the input node through the second coil and having a source coupled to the third coil;
- an output transistor;
- an output transformer including a fourth coil coupled to a source of the output transistor;
- a fifth coil coupled to a gate of the output transistor;
- and a sixth coil coupled to a drain of the output transistor;
- and
- a first cascode transistor coupled between a drain of the first transconductance transistor and the fourth coil.
5 more elements
A method of amplifying an input signal, comprising:
- coupling the input signal through three mutually-coupled coils of an input transformer to cause a transconductance transistor to conduct a current through a cascode transistor;
- and
- conducting the current through an output transformer to produce an output signal at a drain of an output transistor.
A first stage of an amplifier, comprising;
- an input node;
- a first transconductance transistor;
- a first coil coupled between the input node and a node for a reference voltage;
- a second coil coupled between the input node and a gate of the first transconductance transistor;
- a third coil coupled between a source of the first transconductance transistor and the node for the reference voltage, wherein the first coil, the second coil, and the third coil are all mutually coupled to form an input transformer;
- and
- an input capacitor coupled between the input node and ground, the input capacitor being configured with the second coil to form a low-pass filter, wherein the first coil and a gate-to-source capacitance of the first transconductance transistor are configured to form a high-pass filter.
4 more elements
Dependencies are inferred from the claim text.