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US 11,133,781 B2Granted
Doherty amplifier and Doherty amplifier circuit
AssigneeMitsubishi Electric Corporation
InventorsKeigo Nakatani, Yuji Komatsuzaki, Shuichi Sakata, Shintaro Shinjo, Koji Yamanaka
Life of this patent
Estimating the term…
Abstract
Included is a compensation circuit having one end connected to another end of a first output circuit and another end of a second output circuit and another end grounded, the compensation circuit having an electrical length of 90 degrees at a first operation frequency and an electrical length of 45 degrees at a second operation frequency which is half of the first operation frequency.
Claims5
A Doherty amplifier comprising:
- a first input circuit having an electrical length of 180×n (n is an integer greater than or equal to 1) degrees at a first operation frequency of first and second signals that are signals to be amplified;
- a second input circuit having an electrical length of 90 degrees at the first operation frequency;
- a first amplification element to amplify the first signal that has passed through the first input circuit;
- a second amplification element to amplify the second signal that has passed through the second input circuit;
- a first output circuit having one end connected to an output terminal of the first amplification element, the first output circuit having an electrical length of 90 degrees at the first operation frequency;
- a second output circuit having one end connected to an output terminal of the second amplification element and another end connected to another end of the first output circuit, the second output circuit having an electrical length of 180×n degrees at the first operation frequency;
- a compensation circuit having one end connected to the other ends of the first and second output circuits and another end grounded, the compensation circuit having an electrical length of 90 degrees at the first operation frequency and an electrical length of 45 degrees at a second operation frequency which is half of the first operation frequency;
- and
- a controller to switch between operating classes of the first and second amplification elements when operation frequencies of the first and second amplification elements are the first operation frequency and operating classes of the first and second amplification elements when the operation frequencies of the first and second amplification elements are the second operation frequency.
6 more elements
A Doherty amplifier circuit comprising:
- multiple Doherty amplifiers connected in parallel, the Doherty amplifiers each including:
- a first input circuit having an electrical length of 180×n (n is an integer greater than or equal to 1) degrees at a first operation frequency of first and second signals that are signals to be amplified;
- a second input circuit having an electrical length of 90 degrees at the first operation frequency;
- a first amplification element to amplify the first signal that has passed through the first input circuit;
- a second amplification element to amplify the second signal that has passed through the second input circuit;
- a first output circuit having one end connected to an output terminal of the first amplification element, the first output circuit having an electrical length of 90 degrees at the first operation frequency;
- a second output circuit having one end connected to an output terminal of the second amplification element and another end connected to another end of the first output circuit, the second output circuit having an electrical length of 180×n degrees at the first operation frequency;
- a compensation circuit having one end connected to the other ends of the first and second output circuits and another end grounded, the compensation circuit having an electrical length of 90 degrees at the first operation frequency and an electrical length of 45 degrees at a second operation frequency which is half of the first operation frequency;
- and
- a controller to switch between operating classes of the first and second amplification elements when operation frequencies of the first and second amplification elements are the first operation frequency and operating classes of the first and second amplification elements when the operation frequencies of the first and second amplification elements are the second operation frequency;
- a distribution circuit to divide an input signal to multiple signals and outputting each of distributed signals, which are the divided input signals, as signals to be amplified to one of the multiple Doherty amplifiers;
- and
- a combining circuit to combine signals output from the multiple Doherty amplifiers.
10 more elements
Dependencies are inferred from the claim text.