Doherty amplifier incorporating output matching network with integrated passive devices
US-2021376798-A1 · Dec 2, 2021 · US
Doherty amplifier
US12451844B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12451844-B2 |
| Application number | US-202217960938-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 6, 2022 |
| Priority date | Jun 4, 2020 |
| Publication date | Oct 21, 2025 |
| Grant date | Oct 21, 2025 |
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Abstract
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A Doherty amplifier includes: a first amplifier to amplify a first signal as an auxiliary amplifier in a case where a frequency of each of the first signal and a second signal is a first frequency, and amplify the first signal as a main amplifier in a case where the frequency of each of the first signal and the second signal is a second frequency; a second amplifier to amplify the second signal as a main amplifier in a case where the frequency of each of the first signal and the second signal is the first frequency, and amplify the second signal as an auxiliary amplifier in a case where the frequency of each of the first signal and the second signal is the second frequency; and a combiner to synthesize the first signal amplified by the first amplifier and the second signal amplified by the second amplifier.
First claim
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What is claimed is: 1. A Doherty amplifier comprising: a first amplifier to amplify a first signal as an auxiliary amplifier in a case where a frequency of each of the first signal and a second signal is a first frequency, and amplify the first signal as a main amplifier in a case where the frequency of each of the first signal and the second signal is a second frequency; a second amplifier to amplify the second signal as a main amplifier in a case where the frequency of each of the first signal and the second signal is the first frequency, and amplify the second signal as an auxiliary amplifier in a case where the frequency of each of the first signal and the second signal is the second frequency; and a combiner to synthesize the first signal amplified by the first amplifier and the second signal amplified by the second amplifier, wherein the second amplifier has a saturated output power which is larger than a saturated output power of the first amplifier, and in a case where the first amplifier amplifies the first signal as the main amplifier and the second amplifier amplifies the second signal as the auxiliary amplifier, the combiner transforms output impedance of the first amplifier so that an imaginary component in the output impedance of the first amplifier is reduced, the combiner reduces an output reflection coefficient of the first amplifier by transforming the output impedance of the first amplifier in a case where the first amplifier amplifies the first signal as the main amplifier and the second amplifier amplifies the second signal as the auxiliary amplifier, as compared with an output reflection coefficient of the first amplifier in a case where the first amplifier amplifies the first signal as the auxiliary amplifier and the second amplifier amplifies the second signal as the main amplifier, and a reduction amount of the output reflection coefficient based on a difference between the output reflection coefficient of the first amplifier in a case where the first amplifier amplifies the first signal as the main amplifier and the second amplifier amplifies the second signal as the auxiliary amplifier and the output reflection coefficient of the first amplifier in a case where the first amplifier amplifies the first signal as the auxiliary amplifier and the second amplifier amplifies the second signal as the main amplifier, is smaller than an increased amount of the output reflection coefficient of the first amplifier due to a difference between the saturated output power of the first amplifier and the saturated output power of the second amplifier. 2. The Doherty amplifier according to claim 1 , further comprising a transmission line connected between an output side of the first amplifier and the combiner or between an output side of the second amplifier and the combiner, the transmission line having an electrical length of an integral multiple of 180 degrees at the frequency of each of the first signal and the second signal. 3. The Doherty amplifier according to claim 1 , wherein the combiner transforms output impedance of the second amplifier so that an imaginary component in the output impedance of the second amplifier is reduced in a case where the first amplifier amplifies the first signal as an auxiliary amplifier and the second amplifier amplifies the second signal as a main amplifier. 4. The Doherty amplifier according to claim 3 , wherein the combiner increases an output reflection coefficient of the second amplifier by transforming the output impedance of the second amplifier in a case where the first amplifier amplifies the first signal as an auxiliary amplifier and the second amplifier amplifies the second signal as a main amplifier, as compared with an output reflection coefficient of the first amplifier in a case where the first amplifier amplifies the first signal as the main amplifier and the second amplifier amplifies the second signal as the auxiliary amplifier, and an increased amount of the output reflection coefficient based on a difference between the output reflection coefficient of the first amplifier in a case where the first amplifier amplifies the first signal as the main amplifier and the second amplifier amplifies the second signal as the auxiliary amplifier and the output reflection coefficient of the first amplifier in a case where the first amplifier amplifies the first signal as the auxiliary amplifier and the second amplifier amplifies the second signal as the main amplifier is larger than a reduction amount of the output reflection coefficient of the second amplifier due to a difference between the saturated output power of the first amplifier and the saturated output power of the second amplifier. 5. The Doherty amplifier according to claim 3 , wherein the combiner comprises: a first output circuit having a first end connected with an output side of the first amplifier; and a second output circuit having a first end connected with an output side of the second amplifier and a second end connected with a second end of the first output circuit, the first output circuit has an electrical length shorter than 90 degrees in a case where the frequency of each of the first signal and the second signal is the first frequency and has an electrical length of 90 degrees in a case where the frequency of each of the first signal and the second signal is the second frequency, and the second output circuit has an electrical length longer than 90 degrees in a case where the frequency of each of the first signal and the second signal is the first frequency and has an electrical length of 180 degrees in a case where the frequency of each of the first signal and the second signal is the second frequency. 6. The Doherty amplifier according to claim 3 , wherein the first amplifier amplifies the first signal as an auxiliary amplifier and the second amplifier amplifies the second signal as a main amplifier in a case where the frequency of each of the first signal and the second signal is a third frequency, and the combiner transforms the output impedance of the second amplifier so that the imaginary component in the output impedance of the second amplifier is reduced in a case where the frequency of each of the first signal and the second signal is the third frequency, the first amplifier amplifies the first signal as an auxiliary amplifier, and the second amplifier amplifies the second signal as a main amplifier. 7. The Doherty amplifier according to claim 6 , wherein the combiner increases the output reflection coefficient of the second amplifier by transforming the output impedance of the second amplifier in a case where the frequency of each of the first signal and the second signal is the third frequency, the first amplifier amplifies the first signal as an auxiliary amplifier and the second amplifier amplifies the second signal as a main amplifier, as compared with an output reflection coefficient of the first amplifier in a case where the first amplifier amplifies the first signal as the main amplifier and the second amplifier amplifies the second signal as the auxiliary amplifier, and an increased amount of the output reflection coefficient based on a difference between the output reflection coefficient of the first amplifier in a case where the first amplifier amplifies the first signal as the main amplifier and the second amplifier amplifies the second signal as the auxiliary amplifier and the output reflection coefficient of the first amplifier in a case where the first amplifier amplifies the first signal as the auxiliary amplifier and the second amplifier amplifies the second signal as the main amplifier, is larger than a reduction amount of the output reflection coefficient of the first amplifier due to a difference between the satur
Assignees
Inventors
Classifications
A circuit being added at the output of an amplifier to adapt the output impedance of the amplifier · CPC title
A circuit being added at the input of an amplifier to adapt the input impedance of the amplifier · CPC title
with semiconductor devices only · CPC title
Modifications of input or output impedances, not otherwise provided for · CPC title
the amplifier being a radio frequency amplifier · CPC title
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US12451844B2 cover?
- A Doherty amplifier includes: a first amplifier to amplify a first signal as an auxiliary amplifier in a case where a frequency of each of the first signal and a second signal is a first frequency, and amplify the first signal as a main amplifier in a case where the frequency of each of the first signal and the second signal is a second frequency; a second amplifier to amplify the second signal…
- Who is the assignee on this patent?
- Mitsubishi Electric Corp
- What technology area does this patent fall under?
- Primary CPC classification H03F1/0288. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Oct 21 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).