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公开(公告)号：US20250151110A1
公开(公告)日：2025-05-08
申请号：US19016567
申请日：2025-01-10
Applicant: Silicon Laboratories Inc.
Inventor： Terry L. Dickey , Yan Zhou , Wentao Li , Rangakrishnan Srinivasan
IPC: H04W74/0808 , H04L5/00 , H04W4/23 , H04W4/80 , H04W74/04
Abstract: A wireless communication device has a receiver to listen to a sequence of channels. A controller responds to a preamble being detected on a first channel while the receiver is tuned to the first channel by causing the receiver to stay on the first channel and decode packet(s) associated with the preamble. The controller responds to detection of a first symbol of a first transmission protocol and the preamble not being detected to cause the receiver to stay on the first channel for a predetermined time waiting for a retry. The controller responds to detection of a second symbol of a second transmission protocol and the preamble not being detected to cause the receiver to switch to an advertising channel of the second transmission protocol. If no preambles, noise, or symbols are detected, the receiver switches to listening to a next channel in the sequence after a fixed time.
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公开(公告)号：US20210175855A1
公开(公告)日：2021-06-10
申请号：US16705868
申请日：2019-12-06
Applicant: Silicon Laboratories Inc.
Inventor： Rangakrishnan Srinivasan , Mustafa H. Koroglu , Zhongda Wang , Francesco Barale , Abdulkerim L. Coban , John M. Khoury , Sriharsha Vasadi , Michael S. Johnson , Vitor Pereira
Abstract: A transmitter including a frequency synthesizer with a voltage-controlled oscillator that provides an oscillating signal, a programmable delay circuit that delays the oscillating signal to provide a delayed oscillating signal, a power amplifier that is configured to use the delayed oscillating signal for transmitting a signal, and a delay controller that programs the delay circuit with a delay time that reduces interference caused by coupling from the power amplifier to the voltage-controlled oscillator. The delay circuit may be programmed to reduce control voltage change of the voltage-controlled oscillator as a function of delay change, and/or to reduce phase noise degradation at an output of the transmitter as a function of delay change. The delay may be adjusted based on detected operating temperature. A calibration value may be determined at a calibration frequency, in which a frequency offset may be determined based on a selected channel frequency.
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3.发明公开公开(公告)号：US20230189197A1
公开(公告)日：2023-06-15
申请号：US17550417
申请日：2021-12-14
Applicant: Silicon Laboratories Inc.
Inventor： Rangakrishnan Srinivasan , John Khoury
Abstract: A system and method for accurately determining a distance between two network devices using a Channel Sounding application is disclosed. The network devices each guarantee a fixed phase relationship between the transmit circuit and the receive circuit. In one embodiment, this is achieved by disposing the divider outside the phase locked loop and using the output of the divider to create the clocks for both the transmit circuit and receive circuit. In another embodiment, one or more dividers are disposed outside the phase locked loop, each having a reset, such that they can be initialized to a predetermined state. Further, by utilizing a divider with a reset, the quadrature signal generator is guaranteed to output clocks for the transmit circuit and the receive circuit that have a constant phase relationship.
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公开(公告)号：US10256854B1
公开(公告)日：2019-04-09
申请号：US15875278
申请日：2018-01-19
Applicant: Silicon Laboratories Inc.
Inventor： Rangakrishnan Srinivasan , Sriharsha Vasadi , Zhongda Wang , Mustafa H. Koroglu , John M. Khoury , Aslamali A. Rafi , Michael S. Johnson , Francesco Barale , Sherry Xiaohong Wu
Abstract: In an embodiment, an apparatus includes: a transmit circuit to upconvert a baseband signal to a first differential radio frequency (RF) signal, the transmit circuit to convert the first differential RF signal to a first single-ended RF signal; a duty cycle correction circuit coupled to the transmit circuit to receive the first single-ended RF signal and compensate for a duty cycle variation in the first single-ended RF signal to output a duty cycle-corrected RF signal; a conversion circuit to convert the duty cycle-corrected RF signal to a second differential RF signal; and an interface circuit to transfer the second differential RF signal from a first ground domain to a second ground domain.
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公开(公告)号：US09966965B2
公开(公告)日：2018-05-08
申请号：US15370742
申请日：2016-12-06
Applicant: Silicon Laboratories Inc.
Inventor： Aslamali A. Rafi , Rangakrishnan Srinivasan , Francesco Barale
CPC classification number: H03L7/183 , H03L7/0891 , H03L7/099 , H03L7/0995 , H03L7/18 , H03L2207/06
Abstract: An apparatus includes a signal generator. The signal generator includes a voltage controlled oscillator (VCO) coupled to provide an output signal having a frequency. The signal generator further includes an asymmetric divider coupled to receive the output signal of the VCO and to provide an output signal. The output signal of the asymmetric divider has a frequency that is half the frequency of the output signal of the VCO. The asymmetric divider presents a balanced load to the VCO.
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Patent Agency Ranking
公开(公告)号：US12219599B2
公开(公告)日：2025-02-04
申请号：US17743042
申请日：2022-05-12
Applicant: Silicon Laboratories Inc.
Inventor： Terry L. Dickey , Yan Zhou , Wentao Li , Rangakrishnan Srinivasan
Abstract: A wireless communication device has a receiver to listen to a sequence of channels. A controller responds to a preamble being detected on a first channel while the receiver is tuned to the first channel by causing the receiver to stay on the first channel and decode packet(s) associated with the preamble. The controller responds to detection of a first symbol of a first transmission protocol and the preamble not being detected to cause the receiver to stay on the first channel for a predetermined time waiting for a retry. The controller responds to detection of a second symbol of a second transmission protocol and the preamble not being detected to cause the receiver to switch to an advertising channel of the second transmission protocol. If no preambles, noise, or symbols are detected, the receiver switches to listening to a next channel in the sequence after a fixed time.
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公开(公告)号：US12192951B2
公开(公告)日：2025-01-07
申请号：US18618458
申请日：2024-03-27
Applicant: Silicon Laboratories Inc.
Inventor： Rangakrishnan Srinivasan , John Khoury
Abstract: A system and method for accurately determining a distance between two network devices using a Channel Sounding application is disclosed. The network devices each guarantee a fixed phase relationship between the transmit circuit and the receive circuit. In one embodiment, this is achieved by disposing the divider outside the phase locked loop and using the output of the divider to create the clocks for both the transmit circuit and receive circuit. In another embodiment, one or more dividers are disposed outside the phase locked loop, each having a reset, such that they can be initialized to a predetermined state. Further, by utilizing a divider with a reset, the quadrature signal generator is guaranteed to output clocks for the transmit circuit and the receive circuit that have a constant phase relationship.
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公开(公告)号：US11979846B2
公开(公告)日：2024-05-07
申请号：US17550417
申请日：2021-12-14
Applicant: Silicon Laboratories Inc.
Inventor： Rangakrishnan Srinivasan , John Khoury
Abstract: A system and method for accurately determining a distance between two network devices using a Channel Sounding application is disclosed. The network devices each guarantee a fixed phase relationship between the transmit circuit and the receive circuit. In one embodiment, this is achieved by disposing the divider outside the phase locked loop and using the output of the divider to create the clocks for both the transmit circuit and receive circuit. In another embodiment, one or more dividers are disposed outside the phase locked loop, each having a reset, such that they can be initialized to a predetermined state. Further, by utilizing a divider with a reset, the quadrature signal generator is guaranteed to output clocks for the transmit circuit and the receive circuit that have a constant phase relationship.
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公开(公告)号：US11973509B2
公开(公告)日：2024-04-30
申请号：US17709642
申请日：2022-03-31
Applicant: Silicon Laboratories Inc.
Inventor： Rangakrishnan Srinivasan , Zhongda Wang , Francesco Barale , Wenhuan Yu , Mustafa H. Koroglu , Yan Zhou , Terry L. Dickey
CPC classification number: H03L7/1075 , H03L7/099 , H04B1/40
Abstract: A phase-locked loop (PLL) that provides a local oscillator signal for a radio. An oscillator of the PLL supplies an oscillator output signal. Control logic receives a request to change the oscillator output signal to a new frequency and responds to the request by setting a first capacitor circuit of the oscillator to a first capacitance that corresponds to a predetermined frequency of the oscillator output signal. The control logic also responds to the request by setting one or more other capacitor circuits of the oscillator according to temperature and according to a frequency difference between the predetermined frequency and the new frequency. After responding to the request by setting the first capacitor circuit and the one or more other capacitor circuits, the PLL locks to the new frequency using a signal from the PLL loop filter to adjust another capacitor circuit in the oscillator.
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公开(公告)号：US20240022268A1
公开(公告)日：2024-01-18
申请号：US18474395
申请日：2023-09-26
Applicant: Silicon Laboratories Inc.
Inventor： Euisoo Yoo , Arup Mukherji , Rangakrishnan Srinivasan , Vitor Pereira , Zhongda Wang , Sriharsha Vasadi
CPC classification number: H04B1/0064 , H03F3/195 , H03H7/38 , H03F2200/451 , H03F2200/294
Abstract: In one embodiment, an integrated circuit includes: a first radio frequency (RF) circuit configured to receive and process a first RF signal having a sub-gigahertz (GHz) frequency to output a first lower frequency signal and to transmit RF signals having the sub-GHz frequency; a second RF circuit configured to receive and process a second RF signal having a frequency of at least substantially 2.4 GHz to output a second lower frequency signal and to transmit RF signals at the at least substantially 2.4 GHz; shared analog circuitry coupled to the first RF circuit and the second RF circuit, the shared analog circuitry to receive at least one of the first RF signal or the second RF signal and output a digital output signal; and a digital circuit coupled to the shared analog circuit, the digital circuit to recover message information from the digital output signal.
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