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US 2015/0091650 A1Published application
Amplifier with Variable Feedback Impedance
AssigneePeregrine Semiconductor Corporation
InventorsDan William Nobbe, Jianhua Lu
Life of this patent
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Abstract
A variable feedback impedance is presented capable of providing high linearity (e.g. as represented by 1P2 and 1P3) and high linear range (e.g. as represented by P1dB) when used in a feedback path of an RF amplifier in the presence of high voltage amplitudes.
Claims22
A radio frequency (RF) amplifier arrangement comprising:
- an RF amplifier;
- one or more resistive and/or reactive components within a feedback path between an output terminal and an input terminal of the amplifier;
- and
- one or more stacked transistor switches within the feedback path configured to select an impedance value of the feedback path from a plurality of selectable impedance values.
1 more element
A method for reducing the effect of a variable impedance in a feedback path of a radio frequency (RF) amplifier, the method comprising:
- providing an RF amplifier with a characteristic output voltage range;
- providing one or more resistive and/or reactive components;
- providing one or more stacked transistor switches;
- operatively connecting the one or more components and the one or more stacked transistor switches;
- based on the connecting, obtaining a variable impedance with an impedance value of the variable impedance selectable via the one or more stacked transistor switches;
- operatively coupling the variable impedance between an output terminal of the RF amplifier and an input terminal of the RF amplifier;
- based on the coupling, creating a feedback path comprising the variable impedance around the RF amplifier;
- and
- based on the creating, maintaining the characteristic output voltage range of the RF amplifier.
6 more elements
Dependencies are inferred from the claim text.