# US 10,122,390 B2 · Modulated signal generating device and wireless device

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- Number: US 10,122,390 B2
- Document ID: US10122390B2
- Status: Granted
- Kind: B2
- Application number: 15/391,324
- Filed: 2016-12-27
- Published: 2017-08-17
- Granted: 2018-11-06
- Earliest claimed: 2016-02-17
- Assignees: Kabushiki Kaisha Toshiba
- Applicants: Kabushiki Kaisha Toshiba
- Inventors: Yoshimasa Egashira; Keiichi Yamaguchi
- Web page: https://patentgrep.com/patent/US10122390B2

## CPC

- H04B 1/04: Circuits
- H03F 1/32: Modifications of amplifiers to reduce non-linear distortion (by negative feedback H03F1/34)
- H03F 3/19: with semiconductor devices only
- H03F 3/211: {using a combination of several amplifiers (H03F3/60 takes precedence)}
- H03F 3/2175: {using analogue-digital or digital-analogue conversion (H03F3/2173 takes precedence)}
- H03F 3/24: of transmitter output stages
- H03F 3/245: {with semiconductor devices only}
- H03F 3/72: Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
- H04B 1/0475: {with means for limiting noise, interference or distortion (H04B1/0483 takes precedence)}
- H03F 2200/111: the amplifier being a dual or triple band amplifier, e.g. 900 and 1800 MHz, e.g. switched or not switched, simultaneously or not
- H03F 2200/171: A filter circuit coupled to the output of an amplifier
- H03F 2200/451: the amplifier being a radio frequency amplifier
- H03F 2203/21106: An input signal being distributed in parallel over the inputs of a plurality of power amplifiers
- H03F 2203/21142: Output signals of a plurality of power amplifiers are parallel combined to a common output
- H03F 2203/7209: the gated amplifier being switched from a first band to a second band
- H03M 1/12: Analogue/digital converters ({H03M1/001 – } H03M1/10 take precedence)
- H04B 2001/0408: {with power amplifiers}
- H04B 2001/0491: {with frequency synthesizers, frequency converters or modulators}
- H04B: TRANSMISSION
- H03F: AMPLIFIERS
- H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)

## Abstract

A modulated signal generating device that modulates an input signal and generates a modulated signal. The modulated signal generating device includes a first to p-th amplifier, where p=3 to N, and N represents an integer equal to or greater than three, a first to p-th control unit, a first to p−1-th filter, and a combiner. The first amplifier generates a first amplified signal based on a first control signal. The first control unit generates the first control signal based on a first component signal included in the input signal. The first filter eliminates harmonic component included in a first difference signal representing difference between the input signal and the first component signal, and generates a first filtered signal. The combiner combines the first to a p-th amplified signal to generate the modulated signal.

## Claims

### Claim 1

A modulated signal generating device that modulates an input signal and generates a modulated signal, the modulated signal generating device comprising:
a first amplifier that generates a first amplified signal based on a first control signal;
a second amplifier that has a smaller amplification factor as compared to the first amplifier and that generates a second amplified signal based on a second control signal;
a first control unit that generates the first control signal based on a first component signal included in the input signal;
a first filter that eliminates harmonic component included in a first difference signal, which represents difference between the input signal and the first component signal, and generates a first filtered signal;
a second control unit that generates the second control signal based on a second component signal included in the first filtered signal;
a p-th amplifier (wherein p=3 to N, and N represents an integer equal to or greater than three) that has a smaller amplification factor than a p−1-th amplifier and that generates a p-th amplified signal based on a p-th control signal
a p−1-th filter that eliminates harmonic component included in a p−1 th difference signal, which represents difference between a p−2-th component signal and a p−1-th component signal, and generates a p-th component signal;
a p-th control unit that generates the p-th control signal based on the p-th component signal; and
a combiner that combines the first amplified signal, the second amplified signal, and the p-th amplified signal to generate the modulated signal;
wherein the p-th amplifier is plural in number, a plurality of the p-th amplifier is connected to each other in parallel, and each generates the p-th amplified signal, and the p-th control unit includes a p-th control signal generating unit that decides the p-th amplifier to be actuated from among a plurality of the p-th amplifier based on order of priority different for each predetermined interval and generates the p-th control signal for actuating the decided p-th amplifier.

### Claim 2 (depends on 1)

The device according to claim 1, wherein
the first control unit generates the first control signal based on the first component signal in a first frequency range, and
the first filter limits the first difference signal in a second frequency range narrower than the first frequency range and generates the first filtered signal.

### Claim 3 (depends on 2)

The device according to claim 2, wherein the first frequency range as well as the second frequency range is a range including a transmission carrier frequency for transmitting the input signal.

### Claim 4 (depends on 1)

The device according to claim 1, wherein
the first amplifier is plural in number,
a plurality of the first amplifier is connected to each other in parallel, and each generates the first amplified signal, and
the first control unit includes a first control signal generating unit that decides the first amplifier to be actuated from among a plurality of the first amplifier based on order of priority different for each predetermined interval and generates the first control signal for actuating the decided first amplifier.

### Claim 5 (depends on 1)

The device according to claim 1, wherein
the second amplifier is plural in number,
a plurality of the second amplifier is connected to each other in parallel, and each generates the second amplified signal, and
the second control unit includes a second control signal generating unit that decides the second amplifier to be actuated from among a plurality of the second amplifier based on order of priority different for each predetermined interval and generates the second control signal for actuating the decided second amplifier.

### Claim 6 (depends on 1)

The device according to claim 1, wherein the p−1-th filter has a higher cutoff frequency than cutoff frequency of a p−2-th filter.

### Claim 7 (depends on 1)

The device according to claim 1, wherein
the first control unit generates the first control signal based on the first component signal in a first frequency range, and
the p−1-th filter limits the first difference signal in a second frequency range narrower than the first frequency range and generates the first filtered signal.

### Claim 8

A wireless device comprising:
a signal generating unit that generates a transmission signal from transmission data;
a modulating unit that modulates the transmission signal and generates a first modulated signal;
a modulated signal generating device that modulates the first modulated signal and generates a second modulated signal; and
an antenna unit that transmits the second modulated signal, wherein
the modulated signal generating device includes:
a first control unit that generates a first control signal based on a first component signal included in the first modulated signal;
a first filter that eliminates harmonic component included in a first difference signal, which represents difference between the first modulated signal and the first component signal, and generates a first filtered signal;
a second control unit that generates a second control signal based on a second component signal included in the first modulated signal;
a first amplifier that generates a first amplified signal based on the first control signal;
a second amplifier that has a smaller amplification factor as compared to the first amplifier and that generates a second amplified signal based on the second control signal;
a p-th amplifier (wherein p=3 to N, and N represents an integer equal to or greater than three) that has a smaller amplification factor than a p−1-th amplifier and that generates a p-th amplified signal based on a p-th control signal;
a p−1-th filter that eliminates harmonic component included in a p−1-th difference signal, which represents difference between a p−2-th component signal and a p−1-th component signal, and generates a p-th component signal;
a p-th control unit that generates the p-th control signal based on the p-th component signal; and
a combiner that combines the first amplified signal, the second amplified signal, and the p-th amplified signal to generate the second modulated signal;
wherein the p-th amplifier is plural in number, a plurality of the p-th amplifier is connected to each other in parallel, and each generates the p-th amplified signal, and the p-th control unit includes a p-th control signal generating unit that decides the p-th amplifier to be actuated from among a plurality of the p-th amplifier based on order of priority different for each predetermined interval and generates the p-th control signal for actuating the decided p-th amplifier.