Power Amplification System Using Doherty Amplifier with Linearization Circuit and Related Techniques
First Claim
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1. A power amplification system comprising:
- a Doherty power amplifier having an input port and an output port, the Doherty power amplifier to amplify an input signal received at the input port to generate an amplified signal at the output port, the Doherty power amplifier including a carrier amplifier and a peaking amplifier coupled in a parallel arrangement, wherein both the carrier amplifier and the peaking amplifier contribute to RF signal amplification during peak portions of the input signal and only the carrier amplifier contributes to RF signal amplification during non-peak portions of the input signal; and
a linearizer circuit coupled to the input port of the Doherty power amplifier to shape the input signal before it reaches the Doherty power amplifier, the linearizer circuit to increase the relative magnitude of higher power portions of the input signal and to decrease the relative magnitude of lower power portions of the input signal so that the power amplification system operates in a more linear manner than the Doherty power amplifier alone.
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Abstract
A power amplification system includes a linearizer circuit feeding a power amplifier to linearize the operation of the power amplifier. The linearizer circuit may shape the input signal of the power amplifier in a manner that complements the output power versus input power characteristic of the power amplifier. In some embodiments, the linearizer may increase the relative magnitude of higher power portions of the input signal while decreasing the relative magnitude of lower power portions of the input signal to provide an overall increase in the linearity of the power amplification system. The power amplifier may include a Doherty amplifier in some implementations.
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Citations
19 Claims
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1. A power amplification system comprising:
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a Doherty power amplifier having an input port and an output port, the Doherty power amplifier to amplify an input signal received at the input port to generate an amplified signal at the output port, the Doherty power amplifier including a carrier amplifier and a peaking amplifier coupled in a parallel arrangement, wherein both the carrier amplifier and the peaking amplifier contribute to RF signal amplification during peak portions of the input signal and only the carrier amplifier contributes to RF signal amplification during non-peak portions of the input signal; and a linearizer circuit coupled to the input port of the Doherty power amplifier to shape the input signal before it reaches the Doherty power amplifier, the linearizer circuit to increase the relative magnitude of higher power portions of the input signal and to decrease the relative magnitude of lower power portions of the input signal so that the power amplification system operates in a more linear manner than the Doherty power amplifier alone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power amplification system comprising:
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a Doherty power amplifier having an input port and an output port, the Doherty power amplifier to amplify an input signal received at the input port to generate an amplified signal at the output port, the Doherty power amplifier including a carrier amplifier and a peaking amplifier coupled in a parallel arrangement, wherein both the carrier amplifier and the peaking amplifier contribute to RF signal amplification during peak portions of the input signal and only the carrier amplifier contributes to RF signal amplification during non-peak portions of the input signal; and a linearizer circuit to shape the input signal before it reaches the Doherty power amplifier, the linearizer circuit comprising; a linearizer input port to receive an unshaped input signal; a linearizer output port to output a shaped input signal for delivery to the input port of the Doherty amplifier; a divider circuit coupled to the linearizer input port to divide the unshaped input signal into a first signal component and a second signal component; a first radio frequency (RF) signal path to process the first signal component, the first RF signal path comprising a passive delay line having a predetermined length; a second RF signal path to process the second signal component, the second RF signal path comprising an odd number of transistor amplifier stages; and a combiner circuit to combine output signals of the first and second RF signal paths to generate a combined signal at an output port of the combiner circuit, wherein the output port of the combiner circuit is coupled to the linearizer output port. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification