US 2018/0145648 A1 · APPARATUS AND METHODS FOR LOW NOISE AMPLIFIERS

Abstract

Apparatus and methods for low noise amplifiers (LNAs) are provided herein. In certain configurations, an LNA includes a gain stage and a bypass stage electrically connected in parallel with one another between an input and an output. The bypass stage and the gain stage are selectively activated based on a mode of the LNA. For example, the gain stage provides inverting amplification to an input signal received at the input in a gain mode. Additionally, the bypass stage provides a low gain path from the input to the output in a bypass mode. Additionally, the bypass stage includes a balun that provides inversion to the bypass stage such that a phase delay through the bypass stage is similar to a phase delay of the gain stage.

Claims20

Dependent claims

A wireless communication device comprising:

a low noise amplifier including a mode control circuit configured to operate the low noise amplifier in a selected mode chosen from a plurality of modes including a first gain mode and a bypass mode, a first gain circuit electrically connected between an input and an output and operable to provide inverting amplification to a radio frequency input signal received at the input in the first gain mode, and a bypass circuit electrically connected in parallel with the first gain circuit between the input and the output, the bypass circuit including a balun operable to provide inversion to the radio frequency input signal in the bypass mode so as to compensate for a difference in phase delay between the bypass circuit and the first gain circuit;
and
an antenna configured to provide the radio frequency input signal to the low noise amplifier.

Dependencies are inferred from the claim text.

Apparatus and methods for low noise amplifiers

Life of this patent

Apparatus and methods for low noise amplifiers

Life of this patent

Abstract

Claims20