Multi-mode Doherty power amplifier
AssigneePostech Academy-Industry Foundation
InventorsYun Sung Cho, Bum Man Kim, Dae Hyun Kang
Life of this patent
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Abstract
The present invention relates to a Doherty power amplifier in which a new operation mode for accomplishing high efficiency at a lower output power level is added to operation of a conventional Doherty power amplifier, thereby achieving high efficiency at various output power levels of the power amplifier. The multi-mode Doherty power amplifier to which a second power mode is added may be reduced in size so as to be integrated into a chip.
Claims20
A multi-mode Doherty power amplifier comprising:
- a first input impedance matching unit configured to receive an input voltage through one side thereof;
- a first power stage having one side connected to an output terminal of the first input impedance matching unit;
- a first λ/4 impedance control circuit having one side connected to an output terminal of the first power stage;
- a first impedance matching unit having one side connected to an output terminal of the first λ/4 impedance control circuit;
- a second power stage having one side connected to an output terminal of the first impedance matching unit;
- a first harmonic control unit having one side connected to an output terminal of the second power stage;
- a second λ/4 impedance control circuit commonly connected to the output terminal of the second power stage;
- a second impedance matching unit commonly connected to the output terminal of the first power stage;
- a third power stage having one side connected to an output terminal of the second impedance matching unit;
- a second harmonic control unit having one side connected to an output terminal of the third stage;
- a second input impedance matching unit commonly connected to the output terminal of the first input impedance matching unit;
- a fourth power stage having one side connected to an output terminal of the second input impedance matching unit;
- a switching capacitor unit having one side connected to an output terminal of the fourth power stage and the other side connected to a ground voltage;
- a third impedance matching unit having one side commonly connected to the output terminal of the fourth power stage and the other side commonly connected to the output terminal of the second power stage;
- a first output impedance matching unit having one side commonly connected to the output terminals of the second λ/4 impedance control circuit and the third power stage;
- and
- a voltage control circuit having control lines connected to the other sides of the first to fourth power stages, respectively,
- wherein the first output impedance matching unit is configured to transmit an output signal through the other side thereof.
A multi-mode Doherty power amplifier comprising only four amplification units, the four amplification units comprising:
- a first amplification unit configured to amplify an input signal;
- second and third amplification units connected in parallel to the first amplification unit;
- and
- a fourth amplification unit connected in parallel to the first amplification with respect to the input signal,
- wherein the first to fourth amplification units are operated in multiple modes divided into first and second power modes, depending on change of the input signal, wherein the first, second and third amplification units are operated in the first power mode and only the fourth amplification unit is operated in the second power mode.
Dependencies are inferred from the claim text.