Dynamic range improvements of load modulated amplifiers
First Claim
1. A method for power amplifying an input drive signal to a power amplification system comprising at least three different power amplification modes, where each power amplification mode is dedicated to operate within a pre-determined amplification interval, the method comprising:
- determining a momentary envelope value (E) of the input drive signal (Sin); and
switching amplification mode to one of the at least three different amplification modes depending on the determined momentary envelope value (E), where the switching comprises;
operating the power amplification system in a first amplification mode if the momentary envelope value (E) is determined to be within a first amplification interval, and when the power amplification system is operated in the first amplification mode, an outphasing technique is used for power amplifying the input drive signal;
operating the power amplification system in a second amplification mode if the momentary envelope value (E) is determined to be within a second amplification interval; and
operating the power amplification system in a third amplification mode if the momentary envelope value (E) is determined to be within a third amplification interval.
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Accused Products
Abstract
The present invention relates to methods and devices to control and operate the functionality of a power amplifier system (100) capable of operating in at least three differential amplification modes. The drive signal'"'"'s amplitude envelope controls an integrated switch network (104; 105, 106) that routes both the signal envelope and signal phase to different modulation blocks (111, 112: 109, 110: 115). Depending on the envelope strength, the operational mode of the amplifier system is possible to alter to best serve the signal statistics to provide the highest overall power efficiency.
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Citations
18 Claims
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1. A method for power amplifying an input drive signal to a power amplification system comprising at least three different power amplification modes, where each power amplification mode is dedicated to operate within a pre-determined amplification interval, the method comprising:
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determining a momentary envelope value (E) of the input drive signal (Sin); and switching amplification mode to one of the at least three different amplification modes depending on the determined momentary envelope value (E), where the switching comprises; operating the power amplification system in a first amplification mode if the momentary envelope value (E) is determined to be within a first amplification interval, and when the power amplification system is operated in the first amplification mode, an outphasing technique is used for power amplifying the input drive signal; operating the power amplification system in a second amplification mode if the momentary envelope value (E) is determined to be within a second amplification interval; and operating the power amplification system in a third amplification mode if the momentary envelope value (E) is determined to be within a third amplification interval. - View Dependent Claims (2, 3, 4, 5)
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6. A power amplifying system for power amplifying an input drive signal to the power amplifying system, where the power amplifying system operates in at least three different power amplification modes, where each amplification mode is dedicated to operate within a pre-determined amplification interval, the power amplifying comprising:
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a determining device for determining a momentary envelope value (E) of the input drive signal; and a switching amplification mode device for switching to one of the at least three different amplification modes depending on the determined momentary envelope value (E) received from the determining device, where the switching amplification mode device comprises; a switching device for switching the power amplifying system to; a first amplification mode if the momentary envelope value (E) is determined to be within a first amplification interval, a second amplification mode if the momentary envelope value (E) is determined to be within a second amplification interval, and a third amplification mode if the momentary envelope value (E) is determined to be within a third amplification interval, where if the power amplifying system is operated in the first amplification mode, an outphasing technique is used for power amplifying the input drive signal. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A switching amplification mode device in a power amplifying system for power amplifying an input drive signal to the power amplifying system, where the switching amplification mode device operates in at least three different power amplification modes, where each amplification mode is dedicated to operate within a pre-determined amplification interval, the switching amplification mode device comprising:
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a determining device for determining a momentary envelope value (E) of the input drive signal, and a switching mode device for switching the power amplifying system to operate in one of the at least three amplification modes depending on the momentary envelope value (E) received from the determining device, where the switching mode device switches the power amplification amplifying system to; a first amplification mode if the momentary envelope value (E) is determined to be within a first amplification interval, a second amplification mode if the momentary envelope value (E) is determined to be within a second amplification interval, and a third amplification mode if the momentary envelope value (E) is determined to be within a third amplification interval, where if the power amplifying system is operated in the first amplification mode, an outphasing technique is used for power amplifying the input drive signal. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification