# US 2017/0288709 A1 · Amplification apparatus

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- Number: US 2017/0288709 A1
- Document ID: US20170288709A1
- Status: Published application
- Kind: A1
- Application number: 15/468,978
- Filed: 2017-03-24
- Published: 2017-10-05
- Earliest claimed: 2016-04-01
- Assignees: Fujitsu Limited
- Applicants: Fujitsu Limited
- Inventors: Yuichi Utsunomiya
- Web page: https://patentgrep.com/patent/US20170288709A1

## CPC

- H04B 1/0475: {with means for limiting noise, interference or distortion (H04B1/0483 takes precedence)}
- H03F 1/0288: {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}
- H03F 1/3247: {using feedback acting on predistortion circuits (H03F1/3264 takes precedence)}
- H04W 52/346: {distributing total power among users or channels}
- H04W 52/52: using AGC [Automatic Gain Control] circuits or amplifiers
- H03F 2201/3227: Adaptive predistortion based on amplitude, envelope or power level feedback from the output of the main amplifier
- H04B 2001/045: {with means for improving efficiency}
- H04B: TRANSMISSION
- H03F: AMPLIFIERS
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

An amplification apparatus includes a separator configured to separate an input signal into a first signal and a second signal, a first and second amplifiers amplify the first and second signal, a storage, and a processor coupled to the storage and configured to adjust a phase of the second signal on the basis of a first phase value corresponding to a power value of the input signal or a second phase value set within a period in which the first phase value is updated, calculate a power value of an output signal that is synthesis of an output of the first amplifier and an output of the second amplifier, and update the first phase value to the second phase value after the change of the power value of the calculated output signal when the first phase value is the power value of the input signal.

## Claims

### Claim 1

An amplification apparatus comprising:
a separator configured to separate an input signal into a first signal and a second signal;
a first amplifier configured to amplify the first signal;
a second amplifier configured to amplify the second signal;
a storage; and
a processor coupled to the storage and configured to:
adjust a phase of the second signal on the basis of a first phase value corresponding to a power value of the input signal or a second phase value set within a period in which the first phase value is updated;
calculate a power value of an output signal that is synthesis of an output of the first amplifier and an output of the second amplifier; and
update the first phase value to the second phase value after the change of the power value of the calculated output signal when the first phase value is the power value of the input signal.

### Claim 2 (depends on 1)

The amplification apparatus according to claim 1, the processor further configured to:
change the setting phase value in order to a plurality of change values existing within a given range and updates; and
change the specified phase value according to the power value of the input signal to the change value when the power value of the output signal calculated with regard to any of the change values is higher than the power value of the output signal calculated with regard to another change value.

### Claim 3 (depends on 2)

The amplification apparatus according to claim 2, the processor further configured to:
cancel updating the specified phase value;
reduce a change width for the setting phase value; and
reverse a changing direction of the setting phase value when the power value of the calculated output signal with regard to any of the change values is equal to or lower than the power value of the output signal calculated with regard to the other change value.

### Claim 4 (depends on 1)

The amplification apparatus according to claim 1, the processor further configured to:
average the power value of the calculated output signal; and
update the specified phase value according to the power value of the input signal to the setting phase value after the change using the power value of the calculated output signal with regard to the setting phase value after the change and averaged.

### Claim 5 (depends on 1)

The amplification apparatus according to claim 1, the processor further configured to:
update the specified phase value according to the power value of the input signal when the power value of the input signal is equal to or higher than a threshold value within the period; and
cancel updating the specified phase value according to the power value of the input signal when the power value of the input signal is lower than the threshold value.

### Claim 6 (depends on 1)

The amplification apparatus according to claim 1 the processor further configured to:
update the specified phase value according to the power value of the input signal when the power value of the input signal is equal to or higher than a threshold value within the period; and
replace the specified phase value according to the power value of the input signal to a phase value according to the threshold value when the power value of the input signal is lower than the threshold value.

### Claim 7 (depends on 1)

The amplification apparatus according to claim 1, the processor further configured to:
perform a distortion compensation process for the input signal using a distortion compensation coefficient;
update the distortion compensation coefficient based on an error between the input signal and the output signal; and
time-divisionally select calculating and distortion compensation coefficient updating as an output destination of the output signal.