Adaptive multiband power amplifier apparatus
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorsByeong Hak JO, Jong Ok HA, Jeong Hoon KIM, Youn Suk KIM
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Abstract
A power amplifier apparatus, includes an envelope tracking (ET) current bias circuit configured to generate a first ET bias current by calculating a direct current DC, based on a reference voltage, and an ET current, based on an ET voltage, according to an envelope of an input signal; and a power amplifier circuit having a bipolar junction transistor supplied with the first ET bias current and a power voltage to amplify the input signal, wherein an average current of the first ET bias current is controlled to be substantially constant.
Claims30
A power amplifier apparatus, comprising:
- an envelope tracking (ET) current bias circuit configured to generate a first ET bias current by calculating a direct current DC, based on a reference voltage, and an ET current, based on an ET voltage, according to an envelope of an input signal;
- and
- a power amplifier circuit having a bipolar junction transistor supplied with the first ET bias current and a power voltage to amplify the input signal,
- wherein an average current of the first ET bias current is controlled to be substantially constant.
A power amplifier apparatus comprising:
- an envelope tracking (ET) current bias circuit configured to generate a first ET bias current by calculating a direct current DC, based on a reference voltage, and an ET current, based on an ET voltage, according to an envelope of an input signal;
- and
- a power amplifier circuit including first to n-th power amplifier circuits, wherein each of the first to n-th power amplifier circuits has a bipolar junction transistor supplied with the first ET bias current and a power voltage to amplify the input signal,
- wherein an average current of the first ET bias current is controlled to be substantially constant.
Dependencies are inferred from the claim text.