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US 9,178,473 B2Granted
Distortion cancellation for low noise amplifier (LNA) non-linear second order products
AssigneeQUALCOMM Incorporated
InventorJanakiram Ganesh Sankaranarayanan
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Abstract
A device includes a main low noise amplifier (LNA) stage configured to amplify a single-ended communication signal, an auxiliary LNA stage coupled to the main LNA stage, the auxiliary LNA stage configured to cancel non-linear second order products generated by the main LNA stage, and a load circuit configured to receive an output of the main LNA stage and an output of the auxiliary LNA stage, the load circuit configured to convert the single-ended communication signal to a differential signal.
Claims18
A device, comprising:
- a main low noise amplifier (LNA) stage configured to amplify a single-ended communication signal;
- an auxiliary LNA stage coupled to the main LNA stage, the auxiliary LNA stage configured to cancel non-linear second order products generated by the main LNA stage;
- and
- a load circuit configured to receive an output of the main LNA stage and an output of the auxiliary LNA stage, the load circuit configured to convert the single-ended communication signal to a differential signal.
1 more element
A method, comprising:
- amplifying a single-ended communication signal in a low noise amplifier (LNA) having a main LNA stage coupled to an auxiliary LNA stage;
- generating non-linear second order products in the auxiliary LNA stage;
- cancelling non-linear second order products generated by the main LNA stage using the non-linear second order products generated by the auxiliary LNA stage;
- and
- converting the single-ended communication signal to a differential signal using a load circuit configured to receive an output of the main LNA stage and an output of the auxiliary LNA stage.
2 more elements
A device, comprising:
- means for amplifying a single-ended communication signal;
- means for cancelling non-linear second order products generated by first amplifier means using non-linear second order products generated by second amplifier means;
- and
- means for converting the single-ended communication signal to a differential signal.
1 more element
Dependencies are inferred from the claim text.