N-way doherty distributed power amplifier with power tracking
First Claim
1. A power tracking system for power amplifiers, the power tracking system comprising:
- an N-way Doherty distributed amplifier comprising a power splitter with a plurality of outputs and N amplifiers, wherein N is an integer of three or more and an output of the plurality of outputs is coupled to a plurality of the N amplifiers; and
an adaptive bias supply circuitry for adjusting DC bias applied to the N-way Doherty distributed amplifier based on a characteristic of an RF signal,wherein the adaptive bias supply circuit is configured to adjust gate biases of an amplifier and a shunt capacitor, the N-way Doherty distributed amplifier comprising the amplifier and shunt capacitor.
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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.
113 Citations
19 Claims
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1. A power tracking system for power amplifiers, the power tracking system comprising:
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an N-way Doherty distributed amplifier comprising a power splitter with a plurality of outputs and N amplifiers, wherein N is an integer of three or more and an output of the plurality of outputs is coupled to a plurality of the N amplifiers; and an adaptive bias supply circuitry for adjusting DC bias applied to the N-way Doherty distributed amplifier based on a characteristic of an RF signal, wherein the adaptive bias supply circuit is configured to adjust gate biases of an amplifier and a shunt capacitor, the N-way Doherty distributed amplifier comprising the amplifier and shunt capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. 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; routing another of the resultant signals to a plurality of peaking amplifiers; detecting a power variable of a signal representative of the RF input; and adaptively controlling one or more bias voltages of at least one of the amplifiers and a shunt capacitor based at least partly on one or more characteristics corresponding to the RF input, wherein an N-way Doherty distributed amplifier comprises the main and peaking amplifiers and the shunt capacitor. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification