# US 10,873,298 B2 · Power amplification apparatus and television signal transmission system

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- Number: US 10,873,298 B2
- Document ID: US10873298B2
- Status: Granted
- Kind: B2
- Application number: 16/595,033
- Filed: 2019-10-07
- Published: 2020-01-30
- Granted: 2020-12-22
- Earliest claimed: 2018-12-31
- Assignees: NEC Corporation
- Applicants: NEC Corporation
- Inventors: Takuya Tanimoto
- Web page: https://patentgrep.com/patent/US10873298B2

## CPC

- 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 1/07: Doherty-type amplifiers
- H03F 3/193: with field-effect devices (H03F3/195 takes precedence)
- H03F 3/211: {using a combination of several amplifiers (H03F3/60 takes precedence)}
- H04B 1/03: Constructional details, e.g. casings, housings
- H04N 5/38: Transmitter circuitry {for the transmission of television signals according to analogue transmission standards} (H04N5/14 takes precedence)
- H03F 2200/405: the output amplifying stage of an amplifier comprising more than three power stages
- H03F 2203/21142: Output signals of a plurality of power amplifiers are parallel combined to a common output
- H03F: AMPLIFIERS
- H04B: TRANSMISSION
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An amplification unit contains two or more sets containing a plurality of amplification circuits, and amplifies power of an RF (Radio Frequency) signal. A combining unit contains two or more combiners corresponding to the two or more sets, combines RF signals output by the amplification circuits, and outputs a resultant RF signal. The amplification unit and the combining unit have two or more connectors which are arranged transversely. The amplification unit and the combining unit are attachable/detachable.

## Claims

### Claim 1

A power amplification apparatus provided in a television signal transmission system,
the power amplification apparatus is accommodated in a rack, and
the power amplification apparatus comprises:
an amplification unit, containing two or more sets containing a plurality of amplification circuits, that amplifies power of a radio frequency (RF) signal; and
a combining unit, containing two or more combiners corresponding to the two or more sets, that combines RF signals output by the amplification circuits, and outputs a resultant RF signal,
wherein;
the amplification unit and the combining unit have two or more connectors which are arranged transversely when the power amplification apparatus is accommodated in the rack,
the amplification unit and the combining unit are attachable/detachable,
a chassis of the amplifying unit and a chassis of the combining unit are separate chassis, and
the chassis of the amplifying unit and the chassis of the combining unit have one-to-one correspondence when the amplifying unit is attached to the combining unit.

### Claim 2 (depends on 1)

The power amplification apparatus according to claim 1, wherein
the combining unit, containing a second combiner, combines RF signals output by the two or more combiners, and then outputs the resultant RF signal.

### Claim 3 (depends on 1)

The power amplification apparatus according to claim 1, wherein
each amplification circuit is a field effect transistor (FET).

### Claim 4 (depends on 1)

The power amplification apparatus according to claim 1, wherein
the two or more combiners in the combining unit are Doherty combiners.

### Claim 5 (depends on 1)

The power amplification apparatus according to claim 1, wherein
each set of the amplification circuits contains three amplification circuits, wherein one amplification circuit of the three amplification circuits is an amplification circuit which is set so as to operate in Class AB or Class B, and two amplification circuits are amplification circuits which are set so as to operate in Class C, and
the two or more combiners in the combining unit are Doherty combiners.

### Claim 6 (depends on 1)

The power amplification apparatus according to claim 1, wherein
each set of the amplification circuits contains two amplification circuits, wherein one amplification circuit of the two amplification circuits is an amplification circuit which is set so as to operate in Class AB or Class B, and the other is an amplification circuit which is set so as to operate in Class C, and
the two or more combiners in the combining unit are Doherty combiners.