AMPLIFICATION APPARATUS

• US 20130229227A1
• Filed: 01/24/2013
• Published: 09/05/2013
• Est. Priority Date: 03/05/2012
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: MANIWA, Toru
• Granted Patent: US 8,896,372 B2
• Time in Patent Office: Days
• US Class Current: 330/124.R
• CPC Class Codes: H03F 1/0294 using vector summing of two or more constant amplitude phase-modulated signals
• CPC Class Codes: H03F 1/56 Modifications of input or output impedances, not otherwise provided for
• CPC Class Codes: H03F 2200/423 Amplifier output adaptation especially for transmission line coupling purposes, e.g. impedance adaptation
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H03F 3/602 Combinations of several amplifiers
• CPC Class Codes: H03F 3/68 Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics power amplifiers using a combination of several semiconductor amplifiers H03F3/211; combinations of amplifiers using coupling networks with distributed constants H03F3/602

Abstract

A first amplification section and a second amplification section included in an amplification apparatus amplify two constant amplitude signals generated by vector decomposition. An impedance inverting circuit inverts the impedance of the signal amplified by the second amplification section. A combining circuit corrects the phases of the signal amplified by the first amplification section and the signal whose impedance is inverted by the impedance inverting circuit, and combines and outputs these signals. The combining circuit includes a line which is (λ/4)+γ in length and which is an asymmetrical circuit element and a line which is (λ/4)−δ in length and which is an asymmetrical circuit element.

Claims

1. An amplification apparatus for generating two constant amplitude signals from an input signal by vector decomposition and amplifying the two constant amplitude signals, the apparatus comprising:

a first amplification section which amplifies a first signal obtained by the vector decomposition;

a second amplification section which amplifies a second signal obtained by the vector decomposition;

an impedance inverting circuit which inverts impedance of the second signal amplified by the second amplification section; and

a combining circuit which corrects a phase of the first signal amplified by the first amplification section and a phase of the second signal whose impedance is inverted by the impedance inverting circuit and which combines and outputs the first signal and the second signal,

the combining circuit including asymmetrical circuit elements or the asymmetrical circuit elements being inserted between the first amplification section or the second amplification section and the combining circuit.

2. The amplification apparatus according to claim 1, wherein:

the combining circuit includes;

a first line and a second line coupled in parallel to output sides of the first amplification section and the second amplification section; and

a third line and a fourth line coupled in series between the first line and the second line, and

the second line and the third line are the asymmetrical circuit elements.

3. The amplification apparatus according to claim 1 further comprising:

a first open stub coupled to an output side of the first amplification section; and

a second open stub coupled to an output side of the second amplification section,

wherein the first open stub and the second open stub are the asymmetrical circuit elements.

4. The amplification apparatus according to claim 1 further comprising an open stub coupled to an output side of the first amplification section, wherein the open stub and the impedance inverting circuit are the asymmetrical circuit elements.

5. The amplification apparatus according to claim 1, wherein:

the combining circuit includes;

a first line and a second line coupled in parallel to output sides of the first amplification section and the second amplification section; and

a third line and a fourth line coupled in series between the first line and the second line, and

the third line and the impedance inverting circuit are the asymmetrical circuit elements.

6. The amplification apparatus according to claim 1, wherein:

the combining circuit includes;

a first line and a second line coupled in parallel to output sides of the first amplification section and the second amplification section;

a third line and a fourth line coupled in series between the first line and the second line; and

an open stub coupled at a point at which the second line and the fourth line are coupled, and

the third line and the open stub are the asymmetrical circuit elements.

7. The amplification apparatus according to claim 1 further comprising a first open stub coupled to an output side of the first amplification section,

wherein:

the combining circuit includes;

a first line and a second line coupled in parallel to output sides of the first amplification section and the second amplification section;

a third line and a fourth line coupled in series between the first line and the second line; and

a second open stub coupled at a point at which the second line and the fourth line are coupled, and

the first open stub and the second open stub are the asymmetrical circuit elements.

8. The amplification apparatus according to claim 1, wherein:

the combining circuit includes;

a first line and a second line coupled in parallel to output sides of the first amplification section and the second amplification section;

a third line and a fourth line coupled in series between the first line and the second line; and

an open stub coupled at a point at which the second line and the fourth line are coupled, and

the impedance inverting circuit and the open stub are the asymmetrical circuit elements.