Two stage Doherty amplifier
First Claim
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1. A Doherty power amplifier comprising:
- a first power amplifier adapted to receive an input signal and adapted to provide a first output signal which is phase shifted with respect to the input signal;
a second power amplifier, adapted to receive a phase shifted input signal and adapted to provide a second output signal;
characterized in that at least one of the first or the second power amplifiers comprises a first driver power amplifier comprising a first gate input and a first drain output;
the first driver power amplifier being coupled to a first output power amplifier comprising a second gate input and a second drain output;
the first gate input and the second gate input being adapted to receive a control signal, the control signal being obtained after an envelope detection provided by an envelope detector coupled to the input signal; and
a control logic circuit configured and arranged to provide first and second limiter output signals in response to the envelope detection for controlling the first and second gate inputs, respectively, depending on respective amplitudes of the first and second limiter output signals.
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Abstract
The invention refers to a Doherty power amplifier comprising a first power amplifier (Main PA) adapted to receive an input signal and adapted to provide a first output signal which is phase shifted with respect to the input signal. The amplifier further comprises a second power amplifier (Peak PA), adapted to receive a phase shifted input signal and adapted to provide a second output signal. The power amplifier is characterized in that at least one of the first or the second power amplifiers comprises a first driver power amplifier (T1) comprising a first gate input and a first drain output. The first driver power amplifier (T1) is coupled to a first output power amplifier (T2) comprising a second gate input and a second drain output. The first gate input and the second gate input are adapted to receive a control signal, the control signal being obtained after an envelope detection provided by an envelope detector coupled to the input signal.
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Citations
9 Claims
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1. A Doherty power amplifier comprising:
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a first power amplifier adapted to receive an input signal and adapted to provide a first output signal which is phase shifted with respect to the input signal; a second power amplifier, adapted to receive a phase shifted input signal and adapted to provide a second output signal; characterized in that at least one of the first or the second power amplifiers comprises a first driver power amplifier comprising a first gate input and a first drain output; the first driver power amplifier being coupled to a first output power amplifier comprising a second gate input and a second drain output; the first gate input and the second gate input being adapted to receive a control signal, the control signal being obtained after an envelope detection provided by an envelope detector coupled to the input signal; and a control logic circuit configured and arranged to provide first and second limiter output signals in response to the envelope detection for controlling the first and second gate inputs, respectively, depending on respective amplitudes of the first and second limiter output signals. - View Dependent Claims (2)
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3. A Doherty power amplifier comprising:
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a first power amplifier adapted to receive an input signal and adapted to provide a first output signal which is phase shifted with respect to the input signal; a second power amplifier, adapted to receive a phase shifted input signal and adapted to provide a second output signal; characterized in that at least one of the first or the second power amplifiers comprises a first driver power amplifier comprising a first gate input and a first drain output; the first driver power amplifier being coupled to a first output power amplifier comprising a second gate input and a second drain output; the first gate input and the second gate input being adapted to receive a control signal, the control signal being obtained after an envelope detection provided by an envelope detector coupled to the input signal; and a control logic circuit having a first difference amplifier adapted to receive an output signal generated by the envelope detector and a first reference signal and generating a first difference signal; a first limiter adapted to receive the first difference signal and generating a first limiter output signal; a second limiter adapted to receive the output signal generated by the envelope detector and to generate a second limiter output signal; and a summing amplifier adapted to receive the second limiter output signal and the first difference signal, the summing amplifier generating a summing output signal, wherein the first limiter output signal is adapted to control the first gate and the summing output signal is adapted to control the second gate. - View Dependent Claims (4, 5, 6)
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7. A Doherty power amplifier comprising:
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a first power amplifier adapted to receive an input signal and adapted to provide a first output signal which is phase shifted with respect the input signal; a second power amplifier, adapted to receive a phase shifted input signal and adapted to provide a second output signal; characterized in that each one of the first and the second power amplifiers comprises a first driver power amplifier comprising a first gate input and a first drain output; the first driver power amplifier being coupled to a first output power amplifier comprising a second gate input and a second drain output; the first gate input and the second gate input being adapted to receive a control signal, the control signal being obtained after an envelope detection provided by an envelope detector coupled to the input signal; and a control logic circuit configured and arranged to provide first and second limiter output signals in response to the envelope detection for controlling the first and second gate inputs, respectively, depending on respective amplitudes of the first and second limiter output signals.
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8. A method of operating a Doherty power amplifier comprising steps of:
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receiving an input signal by a first power amplifier and providing a first output signal which is phase shifted with respect to the input signal; receiving a phase shifted input signal by a second power amplifier, and providing a second output signal; characterized in that the method further comprises steps of receiving a control signal representing a signal that would be obtained by an envelope detection of the input signal; applying the control signal to a circuit comprising a first driver power amplifier comprising a first gate input and a first drain output, the first driver power amplifier being coupled to a first output power amplifier comprising a second gate input and a second drain output, the first gate input and the second gate input being adapted to receive a control signal, the control signal being obtained after an envelope detection provided by an envelope detector coupled to the input signal; and providing first and second limiter output signals in response to the envelope detection for controlling the first and second gate inputs, respectively, depending on respective amplitudes of the first and second limiter output signals. - View Dependent Claims (9)
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Specification
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Current AssigneeAmpleon Netherlands B.V. (Ampleon Coöperatief UA)
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Original AssigneeNXP B.V. (NXP Semiconductors NV)
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InventorsShen, Yilong
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Primary Examiner(s)NGUYEN, HIEU P
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Application NumberUS13/150,916Publication NumberTime in Patent Office643 DaysField of Search330/295, 330/124.R, 330/84, 330/286, 330/136, 330/310, 330/302US Class Current330/295CPC Class CodesH03F 1/0266 by using a signal derived f...H03F 1/0288 using a main and one or sev...H03F 2200/102 A non-specified detector of...
