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US 8,427,239 B2Granted
Apparatus and method for low noise amplification
AssigneeRenesas Mobile Corporation
InventorsJonne Juhani Riekki, Jari Johannes Heikkinen, Jouni Kristian Kaukovuori
Life of this patent
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Abstract
Embodiments provide an amplifier and a method for using and manufacturing said amplifier that incorporate an impedance matching stage, a feedback circuit, and a gain stage. The impedance matching stage is coupled to the feedback circuit wherein the feedback circuit provides a compensated operating voltage for the impedance matching stage. The output of the impedance matching stage is used to set an input bias voltage for both the impedance matching stage and the gain stage. The output of the impedance matching stage is also used, together with the output of the gain stage, to produce an output of the amplifier.
Claims22
An amplifier comprising:
- an impedance matching stage coupled to an input of the amplifier, an output of the impedance matching stage providing an input bias voltage for the impedance matching stage;
- a feedback circuit coupled to the output of the impedance matching stage and a first voltage source, the feedback circuit providing a compensated operating voltage for the impedance matching stage;
- and
- a gain stage coupled to the input of the amplifier, the output of the impedance matching stage providing an input bias voltage for the gain stage;
- wherein an output of the gain stage and the output of the impedance matching stage are used to produce an output of the amplifier, and
- wherein the feedback circuit comprises an amplifier circuit, the output of the impedance matching stage being coupled to an inverting input of the amplifier circuit, the first voltage source being coupled to a non-inverting input of the amplifier circuit and an operating bias voltage for the impedance matching stage being set based on the output of the amplifier circuit.
3 more elements
An amplifier comprising:
- an impedance matching stage coupled to an input of the amplifier, the output of the impedance matching stage providing an input bias voltage for the impedance matching stage;
- a feedback circuit coupled to the output of the impedance matching stage and a first voltage source, the feedback circuit providing a compensated operating voltage for the impedance matching stage;
- a gain stage coupled to the input of the amplifier, the output of the impedance matching stage providing an input bias voltage for the gain stage;
- and
- a signal coupling stage comprising a NMOS transistor having a source, a gate and a drain, the gate being coupled to the output of the impedance matching stage, the source being coupled to the output of the gain stage, the output of the signal coupling stage being used together with the output of the gain stage to produce an output of the amplifier, and
- wherein an output of the gain stage and the output of the impedance matching stage are used to produce an output of the amplifier.
3 more elements
A method of manufacturing an amplifier comprising:
- providing an impedance matching stage coupled to an input of the amplifier, including coupling an output of the impedance matching stage to provide an input bias voltage for the impedance matching stage;
- providing a feedback circuit coupled to the output of the impedance matching stage and a voltage including arranging the feedback circuit to provide a compensated operating voltage for the impedance matching stage;
- providing a first gain stage coupled to the input of the amplifier, including arranging the output of the impedance matching stage to provide an input bias voltage for the gain stage;
- and
- providing an output of the amplifier based on the output of the impedance matching stage and an output of the gain stage,
- wherein:
- providing the feedback circuit comprises providing an amplifier circuit to implement the feedback circuit, including coupling the output of the impedance matching stage to an inverting input of the amplifier circuit, coupling the voltage source to a non-inverting input of the amplifier circuit and setting an operating bias voltage for the impedance matching stage based on the output of the amplifier circuit;
- and
- providing an output of the amplifier comprises providing a second gain stage between the output of the impedance matching circuit and the output of the amplifier such that the output of the amplifier is based on the output of the first gain stage and the output of the second gain stage.
6 more elements
Dependencies are inferred from the claim text.