Envelope tracking current bias circuit with offset removal function and power amplifier
First Claim
1. An envelope tracking (ET) current bias circuit, comprising:
- an envelope detection circuit configured to detect an ET voltage from an input signal;
a first voltage/current converting circuit configured to convert a reference voltage into a direct current (DC) current and adjust the DC current according to a first control signal;
a second voltage/current converting circuit configured to convert the ET voltage into an ET current, adjust the ET current according to a second control signal, and remove a DC offset current from the ET current to provide an offset compensated ET current; and
an arithmetic circuit configured to calculate levels of the offset compensated ET current and the DC current to generate an ET bias current.
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Accused Products
Abstract
An envelope tracking (ET) current bias circuit comprises an envelope detection circuit detecting an ET voltage from an input signal; a first voltage/current converting circuit converting a reference voltage into a direct current (DC) current and adjusting the DC current according to a first control signal; a second voltage/current converting circuit converting the ET voltage into an ET current, adjusting the ET current according to a second control signal, and removing a DC offset current from the ET current to provide an offset compensated ET current; and an arithmetic circuit calculating levels of the offset compensated ET current and the DC current to generate an ET bias current.
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Citations
17 Claims
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1. An envelope tracking (ET) current bias circuit, comprising:
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an envelope detection circuit configured to detect an ET voltage from an input signal; a first voltage/current converting circuit configured to convert a reference voltage into a direct current (DC) current and adjust the DC current according to a first control signal; a second voltage/current converting circuit configured to convert the ET voltage into an ET current, adjust the ET current according to a second control signal, and remove a DC offset current from the ET current to provide an offset compensated ET current; and an arithmetic circuit configured to calculate levels of the offset compensated ET current and the DC current to generate an ET bias current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power amplifier, comprising:
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an envelope tracking (ET) current bias circuit configured to generate an ET bias current, based on an envelope of an input signal; and a power amplification circuit configured to comprise a buffered bias circuit amplifying the ET bias current to provide a second ET bias current and a power amplifier receiving the second ET bias current to amplify the input signal, wherein the ET current bias circuit comprises; an envelope detection circuit configured to detect an ET voltage from the input signal; a first voltage/current converting circuit configured to convert a reference voltage into a DC current and adjust the DC current according to a first control signal; a second voltage/current converting circuit configured to convert the ET voltage into an ET current, adjust the ET current according to a second control signal, and remove a DC offset current from the ET current to provide an offset compensated ET current; and an arithmetic circuit configured to calculate levels of the offset compensated ET current and the DC current to generate the ET bias current. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification