Impedance matching network with improved quality factor and method for matching an impedance

US9270248B2 · kind B2 · utility

Assignee

• Infineon Technologies AG · DE

Inventors

• Winfried Bakalski · Birkenfeld, DE
• Anthony Thomas · Munich, DE

Key dates

• Filing date: Oct 12, 2012
• Grant date: Feb 23, 2016
• Expiry date: Jan 29, 2034

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10D86/201
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

An impedance matching network comprises a first and a second signal terminal and a reference potential terminal. The network further comprises a first shunt branch between the first signal terminal and the reference potential terminal, the first shunt branch comprising a variable inductive element and a first capacitive element. The impedance matching network also comprises a second shunt branch between the second signal terminal and the reference potential terminal and comprising a second capacitive element. A series branch between the first signal terminal and the second signal terminal comprises a third capacitive element. Optionally, the first, second, and/or third capacitive element may be implemented as a variable capacitive element. The variable capacitive element comprises a plurality of transistors, wherein a combination of off-capacitances Coff of the transistors provide an overall capacitance of the variable capacitive element as a function of at least two independent transistor control signals.