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US 2022/0278656 A1Published application
Wideband auxiliary input for low noise amplifiers
AssigneepSemi Corporation
InventorsRong JIANG, Khushali SHAH
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Abstract
Methods and devices to implement efficiently an AUX terminal in RF front end receivers using LNAs are described. The described methods implement a smaller number of switches resulting in an overall performance improvement by reducing the noise figure at the input of the LNA. The presented devices can be used in low/high gain and bypass modes and can accommodate an arbitrary number of bands over a wide frequency range.
Claims29
A multiband radio frequency (RF) receiver front end comprising:
- a plurality of amplifying transistors;
- a switching block comprising a plurality of switching arrangements, each switching arrangement being in correspondence with a selectable frequency band of a plurality of selectable frequency bands and with an amplifying transistor of the plurality of amplifying transistors;
- one or more impedance matching inductors, each impedance matching inductor coupling a respective switching arrangement to a respective amplifying transistor, each being matched to a respective selectable RF band, and
- an auxiliary (AUX) terminal configured to receive a wideband input signal, the AUX terminal being connected to the plurality of amplifying transistors via the switching block.
1 more element
A multiband radio frequency (RF) receiver front end comprising:
- a low noise amplifier (LNA) having with an LNA input and an LNA output;
- an RF receiver output terminal;
- a plurality of main input terminals in correspondence with a plurality of selectable frequency bands;
- each main input terminal configured to receive a corresponding main input signal of a plurality of main input signals;
- an auxiliary (AUX) terminal being configured to receive a wideband input signal;
- a first switching arrangement coupled between the LNA input and the plurality of main input terminals;
- a second switching arrangement coupled between the AUX terminal and the first switching arrangement;
- a third switching arrangement coupled to the first switching arrangement, and
- an attenuator coupling the AUX terminal and the second switching arrangement to the third switching arrangement;
- wherein, in a first state:
- the first switching arrangement is configured to decouple the plurality of main input terminals from the LNA input;
- the second switching arrangement is configured to decouple the plurality of main input terminals from the AUX terminal;
- based on a selected band of the plurality of selectable frequency band, a combination of the first switching arrangement and the third switching arrangement is configured to convey the wideband signal from the AUX terminal, through the attenuator, to the LNA input.
10 more elements
-31. (canceled)
Dependencies are inferred from the claim text.