Doherty amplifier incorporating output matching network with integrated passive devices
US-2021376798-A1 · Dec 2, 2021 · US
Doherty amplifier
US2023029039A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2023029039-A1 |
| Application number | US-202217960938-A |
| Country | US |
| Kind code | A1 |
| Filing date | Oct 6, 2022 |
| Priority date | Jun 4, 2020 |
| Publication date | Jan 26, 2023 |
| Grant date | — |
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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
Opening claim text (preview).
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. 2 . The Doherty amplifier according to claim 1 , wherein 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 an auxiliary amplifier, and a reduction amount of the output reflection coefficient 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. 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, and an increased amount of the output reflection coefficient 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, and an increased amount of the output reflection coefficient is larger than a reduction 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. 8 . The Doherty amplifier according to claim 6 , 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, 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 has an electrical length greater than or equal to 90 degrees in a case where the frequency of each of the first signal and the second signal is the third 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, 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, and has an electrical length shorter than 270 degrees in a case where the frequency of each of the first signal and the second signal is the third frequency. 9 . The Doherty amplifier according to claim 1 , wherein the first amplifier amplifies the first signal as an auxiliary amplifier when a bias voltage lower than a threshold voltage is applied in a case where the frequency of each of the first signal and the second signal is the first frequency and amplifies the first signal as a main amplifier when a bias voltage greater than or equal to the threshold voltage is applied in a case where the frequency of each of the first signal and the second signal is the second frequency; and the second amplifier amplifies the second signal as a main amplifier when a bias voltage greater than or equal to a threshold voltage is applied in a case where the frequency of each of the first signal and the second signal is the first frequency and amplifies the second signal as an auxiliary amplifier when a bias voltage lower than the threshold voltage is applied in a case where the frequency of each of the first signal and the secon
Assignees
Inventors
Classifications
with semiconductor devices only · CPC title
- H03F1/0288Primary
using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers · CPC title
A circuit being added at the input of an amplifier to adapt the input impedance of the amplifier · CPC title
Modifications of input or output impedances, not otherwise provided for · CPC title
A circuit being added at the output of an amplifier to adapt the output impedance of the amplifier · CPC title
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US2023029039A1 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 Thu Jan 26 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).