公开(公告)号：US11811446B2

公开(公告)日：2023-11-07

申请号：US17241202

申请日：2021-04-27

Applicant: Silicon Laboratories, Inc.

Inventor： Luigi Panseri ,  Yu Su ,  Mustafa H. Koroglu

IPC: H04B1/40 ,  H03F3/19

CPC classification number: H04B1/40 ,  H03F3/19 ,  H03F2200/294 ,  H03F2200/451

Abstract: A bias circuit for a low noise amplifier of a front end interface of a radio frequency communication device including a bias generator providing a bias voltage on a bias node for the low noise amplifier, a first resistive device coupled between the bias node and an input of the low noise amplifier, a first switch coupled in parallel with the first resistive device, and mode control circuitry receiving a mode signal indicative of a mode change, in which the mode control circuitry, in response to a mode change, momentarily activates the first switch to bypass the first resistive device and momentarily increases current capacity of the bias generator. The mode control circuitry may also momentarily activate a second switch to bypass a second resistive device of the bias circuit. The mode control circuitry may increase a sink current of the bias generator in response to the mode change.

公开(公告)号：US20220345098A1

公开(公告)日：2022-10-27

申请号：US17241220

申请日：2021-04-27

Applicant: Silicon Laboratories Inc.

Inventor： Luigi Panseri

IPC: H03F3/45 ,  H04B1/40

Abstract: A power limiting system and method for a low noise amplifier of a front end interface of a radio frequency communication device. A voltage regulator provides a source voltage to the low noise amplifier having a nominal voltage level that optimizes linearity of the low noise amplifier while a power level of a radio frequency input signal provided to an input of the low noise amplifier does not exceed a predetermined power level threshold. Detection circuitry detects when the power level of a radio frequency input signal exceeds the predetermined power level threshold and provides an adjust signal indicative thereof to the voltage regulator to reduce the source voltage below the nominal voltage level.

公开(公告)号：US20220209718A1

公开(公告)日：2022-06-30

申请号：US17587678

申请日：2022-01-28

Applicant: Silicon Laboratories Inc.

Inventor： Luigi Panseri ,  Mustafa H. Koroglu ,  Praveen Vangala ,  John M. Khoury

IPC: H03F1/02 ,  H03F3/24 ,  H04B1/40 ,  H03F1/32

Abstract: An apparatus includes a radio-frequency (RF) circuit, which includes a power amplifier coupled to receive an RF input signal and to provide an RF output signal in response to a modified bias signal. The RF circuit further includes a bias path circuit coupled to modify a bias signal as a function of a characteristic of an input signal to generate the modified bias signal. The bias path circuit provides the modified bias signal to the power amplifier.

公开(公告)号：US20210126587A1

公开(公告)日：2021-04-29

申请号：US16661174

申请日：2019-10-23

Applicant: Silicon Laboratories Inc.

Inventor： Luigi Panseri ,  Mustafa H. Koroglu ,  Praveen Vangala ,  John M. Khoury

IPC: H03F1/02 ,  H03F3/24 ,  H03F1/32 ,  H04B1/40

Abstract: An apparatus includes a radio-frequency (RF) circuit, which includes a power amplifier coupled to receive an RF input signal and to provide an RF output signal in response to a modified bias signal. The RF circuit further includes a bias path circuit coupled to modify a bias signal as a function of a characteristic of an input signal to generate the modified bias signal. The bias path circuit provides the modified bias signal to the power amplifier.