Matching network for load line change
AssigneeMediatek Inc.
InventorsKeng Leong Fong, Wei-Kai Hong, Ming Chung Liu
Life of this patent
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Abstract
An amplifier circuit that includes a first power amplifier configured to drive a load and a second power amplifier configured to drive the load through an impedance step-up network. The impedance step-up network is connected to an output of the second power amplifier. The impedance step-up network is configured to switch into a first mode to present an increased impedance to the first power amplifier, and switch into a second mode in which the impedance step-up network steps-up an impedance seen by the second power amplifier looking into the impedance step-up network.
Claims27
An amplifier circuit, comprising:
- a first power amplifier configured to drive a load;
- a second power amplifier configured to drive the load through a first impedance step-up network;
- the first impedance step-up network, wherein the first impedance step-up network is connected to an output of the second power amplifier, the first impedance step-up network being configured to:
- i) switch into a first mode to present an increased impedance to the first power amplifier;
- and
- ii) switch into a second mode in which the first impedance step-up network steps up an impedance seen by the second power amplifier looking into the first impedance step-up network;
- a third power amplifier configured to drive the load;
- and
- a second impedance step-up network connected to an output of the third power amplifier.
A method of operating an amplifier circuit that includes a first power amplifier configured to drive a load, a second power amplifier configured to drive the load through a first impedance step-up network connected to an output of the second power amplifier, and a third power amplifier configured to drive the load through a second impedance step-up network connected to an output of the third power amplifier, the method comprising:
- switching the first impedance step-up network into a first mode to present an increased impedance to the first power amplifier;
- and
- switching the first impedance step-up network into a second mode in which the first impedance step-up network steps up an impedance seen by the second power amplifier looking into the first impedance step-up network.
An amplifier circuit, comprising:
- a first power amplifier configured to drive a load;
- a second power amplifier configured to drive the load through an impedance step-up network;
- the impedance step-up network, wherein the impedance step-up network is connected to an output of the second power amplifier, the impedance step-up network being configured to:
- i) switch into a first mode to present an increased impedance to the first power amplifier;
- and
- ii) switch into a second mode in which the impedance step-up network steps up an impedance seen by the second power amplifier looking into the impedance step-up network;
- and
- a transformer network comprising at least one of a balun and an LC transformer network.
Dependencies are inferred from the claim text.