Back to results
US 11,152,907 B2Granted
Optimized multi gain LNA enabling low current and high linearity including highly linear active bypass
AssigneepSemi Corporation
InventorsEmre Ayranci, Miles Sanner
Life of this patent
Estimating the term…
Abstract
An LNA having a plurality of paths, each of which can be controlled independently to achieve a gain mode. Each path includes at least an input FET and an output FET coupled in series. A gate of the output FET is controlled to set the gain of the LNA. Signals to be amplified are applied to the gate of the input FET. Additional stacked FETs are provided in series between the input FET and the output FET.
Claims25
A low noise amplifier (LNA) comprising:
- (a) a plurality of parallel-coupled cascode amplifiers, each having an input, an output, a bias port, and a source terminal and configured to receive an input signal on the input and generate an output signal having a selectable gain on the output;
- (b) a first inductance coupled to the output of each of the plurality of parallel-coupled cascode amplifiers and configured to be coupled to a power supply;
- (c) a second inductance coupled to the source terminal of each of the plurality of parallel-coupled cascode amplifiers and configured to be coupled to ground;
- and
- (d) for at least one of the plurality of parallel-coupled cascode amplifiers, a corresponding first switch coupled between a bias voltage source and the bias port, and a corresponding second switch coupled between ground and the bias port;
- wherein the bias port of at least one of the plurality of parallel-coupled cascode amplifiers is selectively couplable to one of a bias voltage source through the corresponding first switch or to ground through the corresponding second switch.
3 more elements
A low noise amplifier (LNA) comprising:
- (a) a plurality of parallel-coupled cascode amplifiers, each having an input, an output, a bias port, and a source terminal and configured to receive an input signal on the input and generate an output signal having a selectable gain on the output;
- (b) a plurality of degeneration inductances, each coupled to the source terminal of a corresponding one of the plurality of parallel-coupled cascode amplifiers and configured to be coupled to ground;
- and
- (c) one or more source switches each coupled between the source terminals of respective pairs of the plurality of parallel-coupled cascode amplifiers;
- wherein the bias port of at least one of the plurality of parallel-coupled cascode amplifiers is selectively couplable to one of a bias voltage source or to ground.
2 more elements
A low noise amplifier (LNA) comprising:
- (a) a plurality of parallel-coupled cascode amplifiers, each having an input, an output, a bias port, and a source terminal and configured to receive an input signal on the input and generate an output signal having a selectable gain on the output;
- (b) one or more source switches each coupled between the source terminals of respective pairs of the plurality of parallel-coupled cascode amplifiers;
- (c) a plurality of degeneration inductances, each coupled to the source terminal of a corresponding one of the plurality of parallel-coupled cascode amplifiers and configured to be coupled to ground;
- and
- (d) a load inductance coupled to the output of each of the plurality of parallel-coupled cascode amplifiers and configured to be coupled to a power supply;
- wherein the bias port of at least one of the plurality of parallel-coupled cascode amplifiers is selectively couplable to one of a bias voltage source or to ground;
- and
- wherein the selectable gain on the outputs of the plurality of parallel-coupled cascode amplifiers is set to a lower gain mode or to a higher gain mode as a function of the number of bias ports of the cascode amplifiers coupled to ground versus coupled to the power supply.
5 more elements
Dependencies are inferred from the claim text.