N-way doherty distributed power amplifier with power tracking
First Claim
1. A power tracking system for power amplifiers comprising:
- an N-way Doherty distributed amplifier comprising a power splitter with a plurality of first outputs and N amplifiers, wherein;
N is an integer of three or more,the N amplifiers includes a main amplifier and at least two peaking amplifiers, the main amplifier belonging to a different amplifier class than the peaking amplifiers,a first output of the plurality of first outputs is distributed via a first transmission line amongst the a plurality of the peaking amplifiers,each amplifier of the N amplifiers produces a second output,the second outputs from the plurality of peaking amplifiers are combined via a second transmission line to produce a third output, andthe third output from the peaking amplifiers is combined with the second output the main amplifier; and
adaptive bias supply circuitry that adaptively adjusts a DC bias applied to at least one amplifier of the N amplifiers.
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Accused Products
Abstract
A power amplifier using N-way Doherty structure with adaptive bias supply power tracking for extending the efficiency region over the high peak-to-average power:ratio of the multiplexing modulated signals such as wideband code division multiple access and orthogonal frequency division multiplexing is disclosed. In an embodiment, present invention uses a dual-feed distributed structure to an N-way Doherty amplifier to improve the isolation between at least one main amplifier and at least one peaking amplifier and, and also to improve both gain and efficiency performance at high output back-off power. Hybrid couplers can be used at either or both of the input and output. In at least some implementations, circuit space is also conserved due to the integration of amplification, power splitting and combining.
116 Citations
21 Claims
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1. A power tracking system for power amplifiers comprising:
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an N-way Doherty distributed amplifier comprising a power splitter with a plurality of first outputs and N amplifiers, wherein; N is an integer of three or more, the N amplifiers includes a main amplifier and at least two peaking amplifiers, the main amplifier belonging to a different amplifier class than the peaking amplifiers, a first output of the plurality of first outputs is distributed via a first transmission line amongst the a plurality of the peaking amplifiers, each amplifier of the N amplifiers produces a second output, the second outputs from the plurality of peaking amplifiers are combined via a second transmission line to produce a third output, and the third output from the peaking amplifiers is combined with the second output the main amplifier; and adaptive bias supply circuitry that adaptively adjusts a DC bias applied to at least one amplifier of the N amplifiers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for processing an RF input, the method comprising:
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dividing the RF input into a plurality of resultant signals; routing at least one of the resultant signals to a main amplifier, the main amplifier producing a first output in response to the at least one of the resultant signals; routing another of the resultant signals via a first transmission line to a plurality of peaking amplifiers, each of the peaking amplifiers producing a second output in response to the another of the resultant signals; combining the second outputs via a second transmission line to produce a third output; combining the first output with the third output; and adaptively controlling one or more bias voltages of at least one of the amplifiers, wherein the main and peaking amplifiers are amplifiers in an N-way Doherty distributed amplifier. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification