Source switched split LNA
AssigneepSemi Corporation
InventorsEmre Ayranci, Miles Sanner
Life of this patent
Estimating the term…
Abstract
A receiver front end amplifier capable of receiving and processing intraband non-contiguous carrier aggregate (CA) signals using multiple low noise amplifiers (LNAs) is disclosed herein. A cascode having a “common source” configured input FET and a “common gate” configured output FET can be turned on or off using the gate of the output FET. A first switch is provided that allows a connection to be either established or broken between the source terminal of the input FET of each LNA. Further switches used for switching degeneration inductors, gate capacitors, and gate to ground capacitors for each leg can be used to further improve the matching performance of the invention.
Claims20
An amplifier including:
- (a) a plurality of independently-controlled low noise amplifiers (LNAs), each including at least an input transistor having a source terminal;
- and
- (b) a source switch coupled between the source terminal of the input transistor of a first of the independently-controlled LNAs and the source terminal of the input transistor of a second of the independently-controlled LNAs, the source switch configured to connect the source terminals while only one of the first and second independently-controlled LNAs is enabled, and disconnect the source terminals while both of the first and second independently-controlled LNAs are enabled.
An amplifier including:
- (a) a plurality of independently-controlled low noise amplifiers (LNAs), each including at least an input transistor having a source terminal;
- (b) a source switch coupled between the source terminal of the input transistor of a first of the independently-controlled LNAs and the source terminal of the input transistor of a second of the independently-controlled LNAs, the source switch configured to connect the source terminals while only one of the first and second independently-controlled LNAs is enabled, and disconnect the source terminals while both of the first and second independently-controlled LNAs are enabled;
- (c) at least one gate capacitance module, each having a first terminal coupled to a gate of an associated input transistor of one of the independently-controlled LNAs, and a second terminal coupled to the source terminal of the associated input transistor;
- and
- (d) at least one degeneration switch, each coupled to the source terminal of an associated input transistor of one of the independently-controlled LNAs and configured to be coupled to a degeneration component.
Dependencies are inferred from the claim text.