Radio-frequency power amplification circuit having stabilization circuit

• US 6,982,603 B2
• Filed: 01/09/2003
• Issued: 01/03/2006
• Est. Priority Date: 08/08/2002
• Status: Active Grant

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Renesas Technology Corporation (Renesas Electronics Corporation)
• Inventors: Chaki, Shin
• Primary Examiner(s): Nguyen, Patricia
• Application Number:
  US10/338,676
• Publication Number:
  US 20040029535A1
• Time in Patent Office: 1,090 Days
• Field of Search: 330/302, 330/306, 330/286, 330/53
• US Class Current: 330/302
• CPC Class Codes: H03F 1/086 with FET's

Abstract

A radio-frequency power amplification circuit includes a transistor and a stablization circuit that is provided upstream of the transistor. The stabilization circuit includes a series resistor, a first end of which is connected to the transistor and a second end of which is connected to an input terminal, a resistance element, a first end of which is connected to the second end of the series resistor, and a short stub, a first end of which is connected to the second end of the resistance element and the second end of which is grounded via a capacitance element.

Claims

1. A radio-frequency power amplification circuit comprising:

an active element; and

a stabilization circuit provided upstream of said active element, wherein said stabilization circuit includes;

a first resistance element, a first end of which is connected to said active element and a second end of which is connected to an input terminal;

a second resistance element, a first end of which is connected to the second end of said first resistance element; and

a short stub, a first end of which is connected to the second end of said second resistance element and a second end of which is grounded.

2. The radio-frequency power amplification circuit according to claim 1, wherein said active element is a transistor having a gate terminal connected to the first end of said first resistance element and a source terminal that is grounded, and the source terminal and said short stub are connected to a common ground.

3. The radio-frequency power amplification circuit according to claim 1, including a capacitance element wherein said short stub is grounded via said capacitance element.