Radio frequency amplifying device and magnetic resonance imaging apparatus

Patent metadata

Field	Value
Publication number	US-11378633-B2
Application number	US-201916568710-A
Country	US
Kind code	B2
Filing date	Sep 12, 2019
Priority date	Sep 14, 2018
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

A radio frequency amplifying device according to an embodiment includes amplifying circuitry, obtaining circuitry, and correcting circuitry. The amplifying circuitry is configured to output an amplified signal obtained by amplifying a signal input thereto. The obtaining circuitry is configured to obtain an envelope indicating a waveform of a radio frequency signal as digital data. The correcting circuitry is configured to correct the obtained envelope on the basis of a rising characteristic of the amplifying circuitry and to input the signal generated on the basis of the envelope resulting from the correction to the amplifying circuitry.

First claim

What is claimed is:

1. An amplifier comprising:
amplifying circuitry configured to output an amplified signal obtained by amplifying a signal input thereto;
obtaining circuitry configured to obtain an envelope indicating a waveform of an output signal as digital data; and
correcting circuitry configured to correct the obtained envelope on a basis of a rising characteristic of the amplifying circuitry and to input the signal generated on a basis of the envelope resulting from the correction to the amplifying circuitry.

2. A radio frequency amplifying device comprising:
amplifying circuitry configured to output an amplified signal obtained by amplifying a signal input thereto;
obtaining circuitry configured to obtain an envelope indicating a waveform of a radio frequency signal as digital data; and
correcting circuitry configured to correct the obtained envelope on a basis of a rising characteristic of the amplifying circuitry and to input the signal generated on a basis of the envelope resulting from the correction to the amplifying circuitry.

3. The radio frequency amplifying device according to claim 2 , wherein
the obtaining circuitry further obtains time information indicating timing to start outputting the amplified signal, as digital data, and
according to the timing indicated by the time information, the correcting circuitry generates the signal on the basis of the envelope resulting from the correction and inputs the generated signal to the amplifying circuitry.

4. The radio frequency amplifying device according to claim 2 , wherein the correcting circuitry increases amplitude of the obtained envelope only for a time period corresponding to the rising characteristic of the amplifying circuitry since a start of the input of the signal.

5. The radio frequency amplifying device according to claim 3 , further comprising: clocking circuitry configured to notify the correcting circuitry of timing to start inputting the signal to the amplifying circuitry, on a basis of the time information, wherein
according to the timing of which the correcting circuitry is notified by the clocking circuitry, the correcting circuitry generates the signal on the basis of the envelope resulting from the correction and inputs the generated signal to the amplifying circuitry.

6. The radio frequency amplifying device according to claim 2 , further comprising:
controlling circuitry configured to control an operation of the amplifying circuitry; and
a directional coupler configured to transmit the amplified signal output from the amplifying circuitry, to a transmission coil configured to generate a radio frequency magnetic field based on the amplified signal and to the controlling circuitry, wherein
the controlling circuitry changes an output level of the amplifying circuitry on a basis of the amplified signal being input thereto.

7. A magnetic resonance imaging apparatus comprising the radio frequency amplifying device according to claim 2 , further comprising:
sequence controlling circuitry configured to output, to the obtaining circuitry, the envelope before being corrected and time information indicating timing to start outputting the amplified signal, as digital data.

Assignees

• Canon Medical Systems Corp

Inventors

• Murakoshi Hiroaki
• Kawaguchi Susumu
• Tanji Masaki
• Yamaki Hirofumi
• Tanaka Hajime

Classifications

• H03F2200/451

  the amplifier being a radio frequency amplifier · CPC title

• H03F3/189 Primary

  High-frequency amplifiers, e.g. radio frequency amplifiers · CPC title

• H03F2200/102

  A non-specified detector of a signal envelope being used in an amplifying circuit · CPC title

• G01R33/3614 Primary

  RF power amplifiers · CPC title