Low-noise amplifier (lna) input impedance improvement using coupling between output inductor and degeneration inductor
AssigneeQUALCOMM Incorporated
InventorsXingyi HUA, Hsiao-Tsung YEN, David Zixiang YANG, Mehmet UZUNKOL
Life of this patent
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Abstract
A low-noise amplifier (LNA) includes a first transistor, a first source inductor coupled to a source of the first transistor, and a second transistor, wherein a source of the second transistor is coupled to a drain of the first transistor, a gate of the second transistor is coupled to a bias circuit, and a drain of the second transistor is coupled to an output of the LNA. The LNA also includes an output inductor coupled between a supply rail and the output of the LNA, wherein the output inductor is magnetically coupled with the first source inductor.
Claims30
A system for wireless communications, comprising:
- a low-noise amplifier (LNA), comprising:
- a first transistor;
- a first source inductor coupled to a source of the first transistor;
- a second transistor, wherein a source of the second transistor is coupled to a drain of the first transistor, a gate of the second transistor is coupled to a bias circuit, and a drain of the second transistor is coupled to an output of the LNA;
- and
- an output inductor coupled between a supply rail and the output of the LNA, wherein the output inductor is magnetically coupled with the first source inductor.
A system for wireless communications, comprising:
- a radio frequency front-end (RFFE) circuit coupled to one or more antennas and comprising:
- a low-noise amplifier (LNA), comprising:
- a first transistor;
- a first source inductor coupled to a source of the first transistor;
- a second transistor, wherein a source of the second transistor is coupled to a drain of the first transistor, a gate of the second transistor is coupled to a bias circuit, and a drain of the second transistor is coupled to an output of the LNA;
- and
- an output inductor coupled between a supply rail and the output of the LNA, wherein the output inductor is magnetically coupled with the first source inductor;
- and
- a receiver coupled to the output of the LNA.
A method for operating a wireless communications system including a low-noise amplifier (LNA), the LNA comprising a first transistor, a first source inductor coupled to a source of the first transistor, a second transistor coupled between an output of the LNA and a drain of the first transistor, and an output inductor coupled between a supply rail and the output of the LNA, the method comprising:
- biasing a gate of the second transistor with a bias voltage;
- receiving a first radio frequency (RF) signal in a first frequency band;
- inputting the first RF signal to a gate of the first transistor;
- and
- magnetically coupling the first source inductor with the output inductor.
Dependencies are inferred from the claim text.