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US 12,155,355 B2Granted
Radio frequency circuit and adjustable transformer
AssigneeHuawei Technologies Co., Ltd.
InventorsKefeng Han, Lei Lu
Life of this patent
Estimating the term…
Abstract
A radio frequency circuit includes an adjustable transformer, a first-stage amplifier, and a second-stage amplifier, the first-stage amplifier is coupled to the second-stage amplifier by using the adjustable transformer, and a bandwidth of the adjustable transformer is adjustable. When the bandwidth of the adjustable transformer is adjusted, an operating frequency band of the radio frequency circuit covers an n258 frequency band and an n257 frequency band, or the n258 frequency band and an n261 frequency band.
Claims20
A radio frequency circuit, comprising:
- an adjustable transformer, comprising a primary coil, a secondary coil, and at least one first coil, wherein the primary coil and the secondary coil are magnetically coupled to each other, the at least one first coil is magnetically coupled to both the primary coil and the secondary coil, a first end of the at least one first coil is coupled to a first node and a second end of the at least one first coil is coupled to a second node, and an impedance between the first node and the second node is adjustable;
- a first-stage amplifier;
- and
- a second-stage amplifier, wherein the first-stage amplifier is coupled to the second-stage amplifier using the adjustable transformer, and a bandwidth of the adjustable transformer is adjustable in a manner that an operating frequency band of the radio frequency circuit is adjustable to cover a first frequency band and a second frequency band, and wherein the first frequency band and the second frequency band are different frequency bands but overlap with each other.
1 more element
An adjustable transformer, comprising:
- a primary coil;
- a secondary coil;
- and
- at least one first coil, wherein the primary coil and the secondary coil are magnetically coupled to each other, the at least one first coil is magnetically coupled to both the primary coil and the secondary coil, a first end of the first coil is coupled to a first node and a second end of the first coil is coupled to a second node, and an impedance between the first node and the second node is adjustable.
1 more element
Dependencies are inferred from the claim text.