公开(公告)号：US20170093032A1

公开(公告)日：2017-03-30

申请号：US14869916

申请日：2015-09-29

Applicant: Silicon Laboratories Inc.

Inventor： John M. Khoury ,  Mustafa Koroglu ,  Abdulkerim Coban ,  Ramin Khoini-Poorfard

IPC: H01Q1/50 ,  H04B7/02

CPC classification number: H01Q1/50 ,  H04B1/18 ,  H04B7/02 ,  H04B7/0805

Abstract: An apparatus includes an integrated circuit (IC), which includes a radio-frequency (RF) circuit to process RF signals, and a balun that has first and second ports. First and second switches are coupled to the second port of the balun. The first port of the balun is coupled to the RF circuit.

公开(公告)号：US12192903B2

公开(公告)日：2025-01-07

申请号：US17329496

申请日：2021-05-25

Applicant: Silicon Laboratories Inc.

Inventor： Pio Balmelli ,  Praveen Vangala ,  John M. Khoury

IPC: H04W52/02

Abstract: A low power wake on radio circuit detects if an RF signal is present on an input to the wake on radio circuit. An RF sense circuit supplies an RF sense signal indicating whether the RF signal is present on the input. The RF sense signal is used to incrementally turn on digital decode logic to determine if a radio transmission that is unique to the wake on radio circuit has been received. If the unique radio transmission have been received, the wake on radio circuit supplies a wakeup signal to the rest of the system.

公开(公告)号：US11894864B2

公开(公告)日：2024-02-06

申请号：US17701742

申请日：2022-03-23

Applicant: Silicon Laboratories Inc.

Inventor： John M. Khoury

IPC: H03M3/00 ,  H04R3/00 ,  H04R3/04 ,  H04R3/02 ,  H03F3/183

CPC classification number: H03M3/422 ,  H03F3/183 ,  H03M3/356 ,  H03M3/458 ,  H04R3/02 ,  H04R3/04 ,  H03F2200/03

Abstract: In one embodiment, an analog-to-digital converter includes: a sum circuit to receive an analog input signal and a feedback reference signal and generate a sum signal; a feedback circuit coupled to the sum circuit to provide the feedback reference signal to the sum circuit; a filter coupled to the sum circuit to receive the sum signal and generate a filtered signal; and a punctured quantizer coupled to the filter to receive the filtered signal and quantize the filtered signal to a digital output and to output the digital output and to provide the digital output to the feedback circuit.

公开(公告)号：US11743852B2

公开(公告)日：2023-08-29

申请号：US17107281

申请日：2020-11-30

Applicant: Silicon Laboratories Inc.

Inventor： John M. Khoury ,  Yan Zhou ,  Michael A. Wu

IPC: H04W56/00 ,  H04W4/02

CPC classification number: H04W56/0035 ,  H04W56/005 ,  H04W4/023

Abstract: In at least one embodiment, a method for measuring a distance between a first communications device including a first local oscillator and a second communications device including a second local oscillator includes unwrapping N phase values to generate N unwrapped phase values. N is an integer greater than one. Each of the N phase values indicate an instantaneous phase of a received signal. The method includes averaging the N unwrapped phase values to generate an average phase value. The method includes wrapping the average phase value to generate a final phase measurement of the first local oscillator with respect to the second local oscillator.

公开(公告)号：US11683012B2

公开(公告)日：2023-06-20

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

CPC classification number: H03F1/0216 ,  H03F1/3205 ,  H03F3/245 ,  H04B1/40 ,  H03F2200/451 ,  H03F2201/3215

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：US20220174633A1

公开(公告)日：2022-06-02

申请号：US17107316

申请日：2020-11-30

Applicant: Silicon Laboratories Inc.

Inventor： Michael A. Wu ,  Wentao Li ,  John M. Khoury ,  Yan Zhou

IPC: H04W56/00

Abstract: A method for communicating between a first radio frequency communications device including a first local oscillator and a second radio frequency communications device including a second local oscillator includes generating phase values based on samples of a received signal. Each of the phase values indicates an instantaneous phase of the received signal. The method includes unwrapping the phase values to generate unwrapped phase values. The method includes generating frequency offset estimates based on the unwrapped phase values. The method includes generating an average frequency offset estimate based on the unwrapped phase values. The method includes wrapping the average frequency offset estimate to generate a residual frequency offset estimate. The method includes adjusting the first local oscillator based on the residual frequency offset estimate, thereby reducing a frequency offset between the first local oscillator and the second local oscillator.

公开(公告)号：US20220173756A1

公开(公告)日：2022-06-02

申请号：US17107327

申请日：2020-11-30

Applicant: Silicon Laboratories Inc.

Inventor： Michael A. Wu ,  Wentao Li ,  Mitchell Reid ,  John M. Khoury ,  Yan Zhou

IPC: H04B1/04 ,  H04L25/06 ,  H03D3/00 ,  H04B1/00 ,  H04B1/30

Abstract: A method for operating a radio frequency communications system includes, while operating a first radio frequency communications device in a calibration mode, for each setting of a plurality of settings of a programmable gain amplifier in a receiver of the first radio frequency communications device configured in a zero-intermediate frequency mode of operation, generating an estimate of a DC offset in each of a plurality of digital samples received from an analog circuit path including the programmable gain amplifier, and storing in a corresponding storage element, a compensation value based on the estimate.

公开(公告)号：US11057834B2

公开(公告)日：2021-07-06

申请号：US16226423

申请日：2018-12-19

Applicant: Silicon Laboratories Inc.

Inventor： Pio Balmelli ,  Praveen Vangala ,  John M. Khoury

IPC: H04W52/02

Abstract: A low power wake on radio circuit detects if an RF signal is present on an input to the wake on radio circuit. An RF sense circuit supplies an RF sense signal indicating whether the RF signal is present on the input. The RF sense signal is used to incrementally turn on digital decode logic to determine if a radio transmission that is unique to the wake on radio circuit has been received. If the unique radio transmission have been received, the wake on radio circuit supplies a wakeup signal to the rest of the system.

公开(公告)号：US10763869B2

公开(公告)日：2020-09-01

申请号：US16221426

申请日：2018-12-14

Applicant: Silicon Laboratories Inc.

Inventor： John M. Khoury

IPC: H03L7/16 ,  G04F10/00 ,  G06F1/03

Abstract: An apparatus includes a digital frequency synthesizer (DFS). The DFS includes a time-to-digital converter (TDC) to provide an output signal that represents a phase difference between a reference signal and a feedback signal. The DFS further includes a scaling circuit, which has an adaptively changed gain, to provide a scaled residue signal used to cancel an effect of the residue signal in the DFS.

公开(公告)号：US20190089306A1

公开(公告)日：2019-03-21

申请号：US15705961

申请日：2017-09-15

Applicant: Silicon Laboratories Inc.

Inventor： John M. Khoury

IPC: H03D3/00 ,  G01F1/66

CPC classification number: H03D3/009 ,  G01F1/66 ,  G01F1/667 ,  H03D3/007 ,  H03D2200/0082

Abstract: A transmitter generates programmable upstream and downstream signal pulses for transmission through a fluid whose flow rate is being measured. A receiver receives the upstream and downstream signal pulses and stores digital representations of the pulses. A multiple pass algorithm such as a time domain windowing function and/or an algorithm that equalizes amplitude operates on the stored digital representations prior to demodulation. A quadrature demodulator generates in-phase and quadrature components of the digital representations and an arctangent function using the in-phase and quadrature components determines angles associated with the upstream and downstream signal pulses. The difference between the upstream and downstream angles, from which a difference in time of flight between the upstream and downstream signal pulses can be derived, is used to determine flow rate.