Multi-band low noise amplifier system
AssigneeTexas Instruments Incorporated
InventorsChih-Ming Hung, Dirk Leipold, Yo-Chuol Ho
Life of this patent
Estimating the term…
Abstract
A low noise amplifier (LNA) operates over multiple frequency bands while occupying less silicon area than known LNA implementations. The LNA includes output matching that can be tuned by an adjustable inductor together with a tunable capacitor bank.
Claims21
A low noise amplifier (LNA) comprising:
- a plurality of DC biasing circuits, each DC biasing circuit operational to provide a DC bias source for a single RF input stage and to increase isolation from other input stages;
- a cascade of radio frequency (RF) input stages, wherein each RF input stage includes a passively tuned RF input circuit biased via a single DC biasing circuit selected from within the plurality of DC biasing circuits;
- and
- a sole RF output node associated with the cascade of RF input stages and the plurality of DC biasing circuits, wherein the LNA operates over multiple frequency bands without use of external switches.
A low noise amplifier (LNA) comprising:
- means for filtering a plurality of radio frequency (RF) input signals;
- and
- means for tuning the plurality of filtered RF input signals at a sole common RF output node such that the LNA operates over multiple frequency bands without use of external input switches and further without use of external output switches.
A low noise amplifier (LNA) comprising a sole tunable RF output stage including at least one adjustable inductor, wherein the sole tunable RF output stage operates via the at least one adjustable inductor to tune filtered RF input signals such that the LNA operates over multiple frequency bands without use of external input switches and further without use of external output switches.
A low noise amplifier (LNA) comprising:
- a plurality of DC biasing circuits, each DC biasing circuit operational to provide a DC bias source for a single RF input stage and to increase isolation from other input stages;
- a cascade of radio frequency (RF) input stages, wherein each RF input stage includes a passively tuned RF input circuit biased via a single DC biasing circuit selected from within the plurality of DC biasing circuits;
- and
- a sole tunable RF output stage including at least one adjustable inductor, wherein the sole tunable RF output stage operates via the at least one adjustable inductor to tune filtered RF input signals generated via the cascade of RF input stages such that the LNA operates over multiple frequency bands without use of external input switches and further without use of external output switches.
A method of operating a low noise amplifier (LNA), the method comprising the steps of:
- providing an LNA having a means for passively filtering a plurality of radio frequency (RF) input signals;
- and
- operating the LNA over multiple frequency bands without use of external switches.
A low noise amplifier (LNA) comprising:
- at least one radio frequency (RF) input stage;
- and
- a sole tunable RF output stage comprising:
- at least one adjustable inductor;
- and
- an adjustable capacitor bank, wherein the at least one adjustable inductor and the adjustable capacitor bank together operate to tune signals passing through the at least one RF input stage to a single RF output node such that the LNA operates over multiple frequency bands without use of RF output stage switches.
Dependencies are inferred from the claim text.