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.
Claims26
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 comprising a bipolar junction transistor that is configured to receive 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,
- wherein a ratio of an average current of the ET current and the direct current is adjusted according to a ratio parameter that is determined in advance;
- and
- wherein the power amplifier further comprises a control circuit configured to generate a first control signal and a second control signal based on the ratio parameter, and provide the generated first and second control signals to the ET current bias circuit.
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 comprising first to n-th power amplifier circuits, wherein each of the first to n-th power amplifier circuits has a bipolar junction transistor that is configured to receive 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,
- wherein a ratio of an average current of the ET current and the direct current is adjusted according to a ratio parameter that is determined in advance, and
- wherein the power amplifier apparatus further comprises a control circuit configured to generate a first control signal and a second control signal based on the ratio parameter, and provide the generated first and second control signals to the ET current bias circuit.
Dependencies are inferred from the claim text.