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公开(公告)号：US11112506B2
公开(公告)日：2021-09-07
申请号：US16377872
申请日：2019-04-08
申请人： Beken Corporation
发明人： Yiming Huang , Weifeng Wang
摘要： An RF front-end circuit in a receiver, comprising a low noise amplifier (LNA) configured to receive an RF signal from an antenna; a frequency synthesizer and divider (FS_DIV), configured to generate a first local oscillation (LO) signal, a second LO signal, a third LO signal and a fourth LO signal; a first front-end circuit communicatively coupled to the LNA and the FS_DIV, and configured to output a first digital intermediate-frequency signal by processing the amplified RF signal and the first LO signal and a second digital intermediate-frequency signal by processing the amplified RF signal, the first and second LO signals; a second front-end circuit communicatively coupled to the LNA and the FS_DIV, and configured to output a third digital intermediate-frequency signal by processing the amplified RF signal and the third LO signal and a fourth digital intermediate-frequency signal by processing the amplified RF signal, the third and fourth LO signals.
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公开(公告)号：US10938359B1
公开(公告)日：2021-03-02
申请号：US16574633
申请日：2019-09-18
申请人： Beken Corporation
发明人： Jiazhou Liu , Donghui Gao
摘要： A power amplifier includes an operational amplifier, a ramp generator communicatively coupled to both a first comparator and a second comparator; the first comparator further communicatively coupled to a negative output port of the operational amplifier; the second comparator further communicatively coupled to a positive output port of the operational amplifier; a first inverter communicatively coupled to the first comparator; a second inverter communicatively coupled to the second comparator; wherein the first inverter is communicatively coupled to both a positive input port of the operational amplifier via a first resistor and coupled to a negative input port of the operational amplifier via a fourth resistor; and the second inverter is communicatively coupled to both the positive input port of the operational amplifier via a second resistor and connected to the negative input port of the operational amplifier via a third resistor.
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公开(公告)号：US10673664B1
公开(公告)日：2020-06-02
申请号：US16598824
申请日：2019-10-10
申请人： Beken Corporation
发明人： Caogang Yu , Weifeng Wang
IPC分类号： H04L27/227 , H04B1/10
摘要： A receiver comprises an I/Q demodulator generates an angular signal by demodulating an in-phase branch and a quadrature branch of a received signal; a filter communicatively coupled to the I/Q demodulator and configured to generate a filtered angular signal by filtering out a noise signal having a frequency higher than a predetermined frequency value from the angular signal; an angle subtractor communicatively coupled to the filter and configured to generate a phase signal based on the filtered angular signal; a phase calibrator communicatively coupled to the angle subtractor and configured to generate a calibrated phase signal based on at least one received preamble signal corresponding to the phase signal and a known value of the at least one received preamble signal corresponding to the phase signal; and a symbol decider communicatively coupled to the phase calibrator and configured to generate an output symbol based on the calibrated phase signal.
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54.发明申请公开(公告)号：US20190251046A1
公开(公告)日：2019-08-15
申请号：US15912508
申请日：2018-03-05
申请人： Beken Corporation
发明人： Yanfeng WANG , Jiazhou LIU
摘要： A method in an on-board unit comprising: receiving and decoding, with a transceiver, a broadcast packet (BCP) from a road side unit (RSU); processing BCP with a micro controller unit (MCU), wherein processing comprises determining whether there is a first interrupt from the transceiver, wherein the first interrupt is used to interrupt idle state of MCU; searching for low level state from a falling edge after the first interrupt; determining whether duration time of low level is within a time range; inputting one byte into the transceiver if duration time is within the range and clearing the first interrupt; determining whether there is a second interrupt from the transceiver, wherein the second interrupt is used to interrupt data reception; processing data in BCP if there is second interrupt; and converting, with the transceiver, processed data to a wireless signal and transmitting the signal to RSU.
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公开(公告)号：US10148236B1
公开(公告)日：2018-12-04
申请号：US15687539
申请日：2017-08-27
申请人： Beken Corporation
发明人： Jiazhou Liu , Dawei Guo
摘要： An embodiment discloses an operational amplifier comprising: an input stage; an output stage communicatively coupled to the input stage, wherein the output stage further comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a first current source, a fifth transistor, a sixth transistor and a second current source, wherein a second node of the first transistor is connected to the input stage (vin), a third node of the first transistor is connected to a third node of the fourth transistor, ground (gnd), a third node of the fifth transistor and a third node of the third transistor, a first node of the first transistor is connected to a first node of the first current source, a second node of the sixth transistor and a second node of the second transistor.
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公开(公告)号：US10133886B1
公开(公告)日：2018-11-20
申请号：US15912443
申请日：2018-03-05
申请人： Beken Corporation
发明人： Mingsheng Ao , Jiazhou Liu
摘要： A card detector configured to be communicatively coupled to a card reader comprises: a first comparator configured to output periodically a first comparison result by comparing a voltage for a device under test with a first reference; a second comparator outputs periodically a second comparison result by comparing a second reference voltage with the first reference voltage, wherein the second reference voltage is adjustable; a decision circuit communicatively coupled to both the first comparator and the second comparator, and decides whether a card is in proximity to the card detector by comparing the time delay relationship between the first comparison result and the second comparison result respectively at a first time point and a second time point different from the first time point, and further wakes up the card reader if the decision circuit decides that the card is in proximity to the card detector.
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公开(公告)号：US10057092B1
公开(公告)日：2018-08-21
申请号：US15808908
申请日：2017-11-10
申请人： Beken Corporation
发明人： Caogang Yu , Dawei Guo
CPC分类号： H04L27/0008 , H04B1/04 , H04B1/0475 , H04B2001/0408
摘要： A switching unit comprises a COordinate Rotation DIgital Computer (CORDIC) unit configured to estimate a maximum phase difference between a phase of the GFSK modulated signal to be switched and a phase of the QPSK modulated signal after switch; a timing unit communicatively coupled to the CORDIC unit and configured to generate adaptive steps according to a switch time and the estimated maximum phase difference, wherein the CORDIC is further configured to generated an adjusted GFSK modulated signal by adjusting a phase of the GFSK modulated signal to be switched according to the estimated maximum phase difference and the adaptive steps.
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公开(公告)号：US10032457B1
公开(公告)日：2018-07-24
申请号：US15616920
申请日：2017-06-08
申请人： Beken Corporation
发明人： Lianxue Liu , Weifeng Wang
IPC分类号： G10L19/005 , G10L25/06 , G06F11/14 , G10L19/16
摘要： A circuit to compensate for a lost audio frame, comprising: an identifier configured to identify a reference audio segment with a first length followed by the lost audio frame with a second length; a searcher coupled to the identifier and configured to search for a first audio segment similar to the reference audio segment in a cached audio segment followed by the reference audio segment by utilizing a cross-correlation search; the identifier further configured to identify a second audio segment subsequent to the first audio segment as a pre-compensated audio frame; an adjustor coupled to the identifier and configured to adjust an amplitude of the second audio segment based on a scale factor; and an output coupled to the adjustor to output the adjusted second audio segment as a compensated audio frame.
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公开(公告)号：US09954494B1
公开(公告)日：2018-04-24
申请号：US15347799
申请日：2016-11-10
申请人： Beken Corporation
发明人： Donghui Gao , Jiazhou Liu , Dawei Guo
CPC分类号： H03F1/26 , H03F1/0277 , H03F1/305 , H03F1/342 , H03F3/185 , H03F3/21 , H03F3/303 , H03F3/45179 , H03F3/45183 , H03F3/72 , H03F2200/03 , H03F2203/30078 , H03F2203/30111 , H03F2203/45151
摘要： A method for suppressing POP noise in an audio operation amplifier, comprising: connecting a first resistor and a second resistor in series at an output stage of the audio operation amplifier by turning on a first switch and a second switch; generating, with a ramp generator, a ramp voltage after an audio signal is input into the audio operation amplifier, wherein the ramp voltage varies from zero to a first value; generating, with an voltage generator, a second voltage, wherein a third switch is turned on and a fourth switch is turned off when the ramp voltage reaches the second value; short-circuiting the first and second resistors by turning off the first and second switches; and outputting, with the audio operation amplifier, an amplified audio signal.
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公开(公告)号：US09941889B1
公开(公告)日：2018-04-10
申请号：US15590730
申请日：2017-05-09
申请人： Beken Corporation
发明人： Dawei Guo , Caogang Yu
CPC分类号： H03L7/0805 , G06F7/49942 , H03C3/0933 , H03K5/133 , H03K21/00 , H03L7/18 , H03L7/197 , H03L7/1976
摘要： A circuit for compensating quantized noise in fractional-N frequency synthesizer, comprising a PLL circuit that locks a phase compensated signal to a phase of a reference phase, wherein the phase lock loop circuit comprises a frequency divider and a phase frequency detector; a sigma-delta modulation and phase difference calculator coupled to the frequency divider generating an accumulated phase error by accumulating all previous differences between an input of the frequency divider and an output of the frequency divider within a period; a digital controlled delay line coupled to both the frequency divider and the SDM and Phase Difference calculator and generates the phase compensated signal by multiplying the accumulated phase error with a delay control word; and the phase frequency detector further generates a phase error by comparing the phase compensated signal with the reference clock.
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