Envelope-tracking current bias circuit with offset cancellation function
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorsByeong Hak JO, Jeong Hoon KIM, Jong Ok HA
Life of this patent
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Abstract
An envelope-tracking current bias circuit includes a first rectifying circuit, a second rectifying circuit, and a first arithmetic circuit. The first rectifying circuit is configured to detect an envelope of an input signal, and provide an envelope detection signal comprising a first direct current (DC) offset voltage. The second rectifying circuit is configured to provide a second DC offset voltage corresponding to the first DC offset voltage. The first arithmetic circuit is configured to provide an envelope signal in which the first DC offset voltage is reduced through subtraction between the envelope detection signal and the second DC offset voltage.
Claims16
An envelope-tracking current bias circuit comprising:
- a first rectifying circuit configured to detect an envelope of an input signal, and provide an envelope detection signal comprising a first direct current (DC) offset voltage;
- a second rectifying circuit configured to provide a second DC offset voltage corresponding to the first DC offset voltage;
- and
- a first arithmetic circuit configured to provide an envelope signal in which the first DC offset voltage is reduced through subtraction between the envelope detection signal and the second DC offset voltage.
An envelope-tracking current bias circuit, comprising:
- a first rectifying circuit configured to detect an envelope of an input signal, and provide an envelope detection signal comprising a first DC offset voltage;
- a second rectifying circuit configured to provide a second DC offset voltage corresponding to the first DC offset voltage;
- a first arithmetic circuit configured to provide an envelope signal in which the first DC offset voltage is reduced through subtraction of the envelope detection signal from the second DC offset voltage;
- a first current source circuit configured to generate a DC current based on a reference voltage, and control the DC current based on a first control signal;
- a second current source circuit configured to generate an envelope-tracking (ET) current based on the envelope signal, and control the ET current based on a second control signal;
- and
- a bias current generating unit configured to generate an ET bias current based on the DC current and the ET current.
Dependencies are inferred from the claim text.