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US 2015/0311869 A1Published application
Amplifier circuit and operation method thereof
AssigneeSamsung Electronics Co., Ltd.
InventorsHiroyoshi Kikuchi, Kazuhiro Ueda
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AssigneeSamsung Electronics Co., Ltd.
InventorsHiroyoshi Kikuchi, Kazuhiro Ueda
Estimating the term…
Disclosed is an amplifier circuit capable of achieving high efficiency at back off power while maintaining high output power when an amplifier of a driving stage is saturated in a multistage amplifier in which a plurality of amplifiers are connected in series to each other. In the amplifier circuit, at least two amplifiers including a first amplifier and a second amplifier, the first amplifier preceding the second the first amplifier, are connected in series to each other, the second amplifier changes input impedance according to output power from the first amplifier, and an impedance adjusting unit for adjusting output load impedance of the first amplifier is disposed between the first amplifier and the second amplifier, wherein the impedance adjusting unit optimizes the output load impedance of the first amplifier according to a change of input impedance of the second amplifier.
An amplifier circuit comprising:
An method of operating an amplifier circuit, the operation method comprising:
A wireless communication apparatus comprising:
The wireless communication apparatus according to claim 18, wherein the impedance adjusting unit comprises a phase adjusting unit configured to adjust a phase of a signal output from the matching circuit.
Dependencies are inferred from the claim text.