EFFICIENT LINEAR LINC POWER AMPLIFIER
First Claim
1. Method for setting up a RF power amplifier circuit arrangement for amplification of RF input signals with modulated amplitude and modulated phase,wherein the circuit includes first and second amplification branches each having an input and an output, for amplifying one of a first and a second component signal of which only the phase is modulated, and a combination of which corresponding to the RF input signal;
- wherein in each of the first and second amplification branches, respective first and second amplification devices are configured to operate in a switching-mode with a respective duty-cycle; and
wherein a combination circuit is configured to combine the outputs of the first and second amplification branches such that the circuit arrangement is arranged for operating in an out-phasing configuration;
the method comprising;
setting values of first and second reactive inductive components of the combination circuit connected to respective first and second amplification device outputs of the respective first and second amplification devices, in accordance with a criteria of zero-voltage switching for each of the first and second amplification devices as a separate component; and
adjusting the first and second duty-cycles for operating the first and second switching-mode amplification devices in accordance with a criteria of a constant phase of the output signal of the circuit arrangement with respect to an out-phasing angle of an out-phasing configuration by sweeping the out-phasing angle for different duty-cycles, and monitoring phase and efficiency as a function of the out-phasing angle.
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Accused Products
Abstract
Method for setup of parameter values in a RF power amplifier circuit arrangement (200), wherein the amplifier circuit arrangement (200) comprises a first (210) and a second (220) amplification branch and is operated in an out-phasing configuration for amplification of RF input signals with modulated amplitude and modulated phase and respective circuit arrangements are disclosed. According to a first aspect a re-optimization of the dead-time or conversely the duty-cycle, respectively, the phase of the output signal after the combiner can be kept linear with respect to the out-phasing angle. Further, according to a second aspect, additionally to introduction of an optimally chosen dead-time, a non-coherent combiner (Lx, Lx*) can reduce crowbar current and switching losses due the output capacitance (Cds). Furthermore, according to a third aspect the reactive compensation can, additionally or alternatively, be controlled by operating both amplification branches at different duty-cycles.
60 Citations
14 Claims
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1. Method for setting up a RF power amplifier circuit arrangement for amplification of RF input signals with modulated amplitude and modulated phase,
wherein the circuit includes first and second amplification branches each having an input and an output, for amplifying one of a first and a second component signal of which only the phase is modulated, and a combination of which corresponding to the RF input signal; -
wherein in each of the first and second amplification branches, respective first and second amplification devices are configured to operate in a switching-mode with a respective duty-cycle; and wherein a combination circuit is configured to combine the outputs of the first and second amplification branches such that the circuit arrangement is arranged for operating in an out-phasing configuration; the method comprising; setting values of first and second reactive inductive components of the combination circuit connected to respective first and second amplification device outputs of the respective first and second amplification devices, in accordance with a criteria of zero-voltage switching for each of the first and second amplification devices as a separate component; and adjusting the first and second duty-cycles for operating the first and second switching-mode amplification devices in accordance with a criteria of a constant phase of the output signal of the circuit arrangement with respect to an out-phasing angle of an out-phasing configuration by sweeping the out-phasing angle for different duty-cycles, and monitoring phase and efficiency as a function of the out-phasing angle. - View Dependent Claims (2, 3, 5, 6, 7)
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4. A RF power amplifier circuit arrangement for amplification of RF input signals with modulated amplitude and modulated phase, the circuit arrangement comprising:
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first and second amplification branches each having an input and an output and being configured for amplifying one of a first and a second component signals of which only a phase is modulated, a combination of which corresponding to the RF input signal; in each of the first and second amplification branches, respective first and second amplification devices configured to be operative in a switching-mode, wherein each amplification branch has a respective first and a second duty-cycle; wherein the outputs of the first and second amplification branches are combined by a combination circuit such that the circuit arrangement is operative in an out-phasing configuration; wherein respective first and second reactive inductive components (Lx) are connected to the respective output of the first and second amplification devices; and wherein the first and second duty-cycles for operating the first and second switching-mode amplification devices are different. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification