Ultra low noise high linearity LNA for multi-mode transceiver
AssigneeQUALCOMM Incorporated
InventorsZixiang Yang, Chiewcharn Narathong, Bo Sun
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Abstract
An amplifier for operating at low, middle or high linearity modes, the amplifier comprising a first low noise amplifier (LNA) coupled to a second low noise amplifier for providing amplification; a first degeneration inductor coupled to the first LNA for providing impedance matching; a −g3 generation block coupled to an output of the second LNA for canceling third-order transconductance distortion; and a first enabling/disabling component coupled to the output of the second LNA and aligned in parallel with the −g3 generation block for operating at least one of the first and second LNAs at one of the low, middle or high linearity modes.
Claims18
An amplifier for operating at low, middle or high linearity modes, the amplifier comprising:
- a first low noise amplifier (LNA) coupled to a second low noise amplifier for providing amplification;
- a first degeneration inductor coupled to the first LNA for providing impedance matching;
- a −g3 generation block coupled to an output of the second LNA for canceling third-order transconductance distortion;
- a first enabling/disabling component coupled to the output of the second LNA and aligned in parallel with the −g3 generation block for operating at least one of the first and second LNAs at one of the low, middle or high linearity modes;
- and
- a second enabling/disabling component aligned in parallel to the first enabling/disabling component while coupled to the second LNA at a first end and to a ground at a second end.
An amplifier for operating at low linearity, middle linearity or high linearity modes, the amplifier comprising:
- an RF input port;
- a first low noise amplifier (LNA) and a second LNA both coupled to the RF input port for providing amplification;
- a first degeneration inductor coupled to the first LNA and the second LNA for providing impedance matching;
- a −g3 generation block coupled to an output of the second LNA for canceling third-order transconductance distortion;
- a first switch coupled to the output of the second LNA and aligned in parallel with the −g3 generation block;
- and
- a second switch aligned in parallel with the −g3 generation block while coupled to the second LNA at a first end and to a ground at a second end and wherein either a) the first switch is closed to operate the first and second LNAs in the low linearity mode or b) the first switch is open and the second switch is closed to operate the first and second LNAs in the high linearity mode.
An apparatus for operating at low linearity, middle linearity or high linearity modes, the apparatus comprising:
- an RF input means;
- a first amplifying means and a second amplifying means both coupled to the RF input means for providing amplification;
- a first degeneration means coupled to the first amplifying means and the second amplifying means for providing impedance matching;
- a −g3 generation means coupled to an output of the second amplifying means for canceling third-order transconductance distortion;
- a first switching means coupled to the output of the second amplifying means and aligned in parallel with the −g3 generation means;
- and
- a second switching means aligned in parallel with the −g3 generation means while coupled to the second amplifying means at a first end and to a ground at a second end and wherein either a) the first switching means is closed to operate the first and second amplifying means in the low linearity mode or b) the first switching means is open and the second switching means is closed to operate the first and second amplifying means in the high linearity mode.
Dependencies are inferred from the claim text.