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1. 发明授权

US09698799B2 Phase locked loop frequency calibration circuit and method 有权
公开(公告)号：US09698799B2
公开(公告)日：2017-07-04
申请号：US15191457
申请日：2016-06-23
申请人： SHANGHAI EASTSOFT MICROELECTRONICS CO., LTD.
发明人： Ruijin Liu , Xu Zhang , Jingjing Tao , Jiejie Lv
IPC分类号： H03L7/06 , H03L7/10 , H03L7/099 , H03L7/089 , H03L7/093 , H03L7/181 , H03L7/08
CPC分类号： H03L7/102 , H03L7/08 , H03L7/0891 , H03L7/093 , H03L7/099 , H03L7/181 , H03L2207/06
摘要： A phase locked loop frequency calibration circuit and a method are provided. The circuit includes a timer, a counter, a control module, a frequency divider and a voltage controlled oscillator; output of voltage controlled oscillator is connected with first input of frequency divider, output of frequency divider is connected with first input of counter, second input of frequency divider, first input of timer and second input of counter are respectively connected with first output of control module, third input of counter is connected with output of timer, output of counter is connected with first input of control module, a reference clock signal is respectively sent to second input of timer and second input of control module, the number of clocks used by frequency divider to perform frequency division on output clock signal of voltage controlled oscillator is sent to third input of control module.

2. 发明授权

US11012266B2 Sub-carrier estimation method and apparatus in multi-carrier communication system 有权
公开(公告)号：US11012266B2
公开(公告)日：2021-05-18
申请号：US16221389
申请日：2018-12-14
申请人： SHANGHAI EASTSOFT MICROELECTRONICS CO., LTD.
发明人： Song Pan , Liwei Shen , Guangsheng Chen
IPC分类号： H04L12/26 , H04L25/03 , H04L27/26
摘要： Provided are a sub-carrier estimation method in a multi-carrier communication system and an apparatus. The method includes: receiving a data frame transmitted by a transmitting end, and extracting a training sequence from the data frame; performing fast Fourier transform operation on the training sequence and a preset reference sequence, respectively, to obtain frequency domain data of the training sequence and frequency domain data of the reference sequence, and conjugately multiplying the two kinds of frequency domain data; extracting real part of conjugate multiplication result; averaging values in each column of an M×N array, respectively, to obtain an output array of 1 row and N columns; and estimating, according to the value in each column of the output array of 1 row and N columns, whether valid data is transmitted over N sub-carriers corresponding to the output array of 1 row and N columns.

3. 发明授权

US09722831B2 Carrier frequency offset processing method and apparatus and receiver 有权
公开(公告)号：US09722831B2
公开(公告)日：2017-08-01
申请号：US15164741
申请日：2016-05-25
申请人： SHANGHAI EASTSOFT MICROELECTRONICS CO., LTD.
发明人： Liwei Shen , Ruijin Liu , Song Pan
IPC分类号： H04L27/14 , H04L27/152 , H04B1/10 , H03J1/00 , H04L27/148
CPC分类号： H04L27/152 , H03J1/0008 , H04B1/1027 , H04L27/148
摘要： The invention provides a carrier frequency offset processing method, an apparatus and a receiver. The method comprises: receiving, through a software and hardware interface, an estimated value of frequency offset of a data packet transmitted by an automatic frequency offset control module; collecting the received estimated value of frequency offset of the data packet and performing statistical analysis to obtain a statistical value of carrier frequency offset between a receiving module and a transmitting module; and dynamically adjusting, according to the statistical value of carrier frequency offset, a bandwidth of a low-pass filter through the software and hardware interface. The invention realizes dynamic adjustment of the bandwidth of the low-pass filter in the process of a receiver receiving signals, solving the problem of the impact on processing performance brought by the fixed bandwidth of a low-pass filter in the prior art.

4. 发明授权

US09564857B2 Low noise amplifier and chip 有权
标题翻译：低噪声放大器和芯片
公开(公告)号：US09564857B2
公开(公告)日：2017-02-07
申请号：US14981820
申请日：2015-12-28
申请人： SHANGHAI EASTSOFT MICROELECTRONICS CO., LTD.
发明人： Jingjing Tao , Xu Zhang , Ruijin Liu
IPC分类号： H03F3/04 , H03F1/02 , H03F3/30 , H03F3/45 , H03F3/16 , H03F1/26
CPC分类号： H03F1/0205 , H03F1/0266 , H03F1/26 , H03F3/16 , H03F3/3001 , H03F3/45179 , H03F2200/294 , H03F2200/555 , H03F2203/30015
摘要： A low noise amplifier and a chip. The amplifier includes a biasing circuit unit, a first amplifying circuit unit, a first adjusting unit, a first signal input, a second signal input and a first signal output; the biasing circuit unit includes a first voltage output and a second voltage output; the first amplifying circuit unit includes a first N-type transistor, a first P-type transistor, a first output capacitor, a second output capacitor, a first impedance and a second impedance; gates of first N-type and P-type transistors are connected to first voltage output and first signal input, and second voltage output and first signal input, respectively, via adjusting unit; source of first N-type transistor is connected to source of first P-type transistor and second signal input; drains of first N-type and P-type transistors are connected respectively to impedance, and to first signal output and second signal output via output capacitor.
摘要翻译：低噪声放大器和芯片。放大器包括偏置电路单元，第一放大电路单元，第一调整单元，第一信号输入端，第二信号输入端和第一信号输出端; 偏置电路单元包括第一电压输出和第二电压输出; 第一放大电路单元包括第一N型晶体管，第一P型晶体管，第一输出电容器，第二输出电容器，第一阻抗和第二阻抗; 第一N型和P型晶体管的栅极分别经由调节单元连接到第一电压输出和第一信号输入，第二电压输出和第一信号输入; 第一N型晶体管的源极连接到第一P型晶体管的源极和第二信号输入端; 第一N型和P型晶体管的漏极分别连接到阻抗，并且通过输出电容器首先将信号输出和第二信号输出。

5. 发明授权

US11641295B1 Method and device for estimating carrier frequency offset, and computer readable storage medium 有权
公开(公告)号：US11641295B1
公开(公告)日：2023-05-02
申请号：US17543906
申请日：2021-12-07
申请人： SHANGHAI EASTSOFT MICROELECTRONICS CO., LTD.
发明人： Liwei Shen , Guangsheng Chen , Song Pan
IPC分类号： H04L27/00 , H04L27/14
摘要： A method and device for estimating a carrier frequency offset, and a computer-readable storage medium are provided. The method includes: determining a target area where a phase discrimination signal is located, wherein the target area is one of N numbers of candidate areas, the N numbers of candidate areas correspond to different value ranges, an union range of the N numbers of candidate areas is [π, −π], and N≥2; determining a first estimation value of a direct current component corresponding to the phase discrimination signal based on the target area; and performing a carrier frequency offset compensation on the phase discrimination signal based on the first estimation value of the direct current component.

6. 发明申请

US20230111713A1 Method and Device for Estimating Carrier Frequency Offset, and Computer Readable Storage Medium 有权
公开(公告)号：US20230111713A1
公开(公告)日：2023-04-13
申请号：US17543906
申请日：2021-12-07
申请人： SHANGHAI EASTSOFT MICROELECTRONICS CO., LTD.
发明人： Liwei SHEN , Guangsheng CHEN , Song PAN
IPC分类号： H04L27/00 , H04L27/14
摘要： A method and device for estimating a carrier frequency offset, and a computer-readable storage medium are provided. The method includes: determining a target area where a phase discrimination signal is located, wherein the target area is one of N numbers of candidate areas, the N numbers of candidate areas correspond to different value ranges, an union range of the N numbers of candidate areas is [π, −π], and N≥2; determining a first estimation value of a direct current component corresponding to the phase discrimination signal based on the target area; and performing a carrier frequency offset compensation on the phase discrimination signal based on the first estimation value of the direct current component.

7. 发明授权

US09431959B2 Crystal oscillator 有权
标题翻译：水晶振荡器
公开(公告)号：US09431959B2
公开(公告)日：2016-08-30
申请号：US14965849
申请日：2015-12-10
申请人： SHANGHAI EASTSOFT MICROELECTRONICS CO., LTD.
发明人： Ruijin Liu , Xu Zhang , Jingjing Tao
IPC分类号： H03B5/36 , H03B5/04
CPC分类号： H03B5/364 , H03B5/04
摘要： A crystal oscillator, including: a voltage stabilizing unit, a transconductance unit, a feedback resistor, a crystal resonator and at least two ground capacitors. The voltage stabilizing unit includes a current source and a first branch circuit including PMOS and NMOS connected in series, PMOS has its source connected to output of the current source, PMOS and NMOS have their gates connected to drains thereof, and NMOS has its source connected to ground. The transconductance unit includes a second branch circuit including PMOS and NMOS connected in series, PMOS has its source connected to output of the voltage stabilizing unit, PMOS and NMOS have their gates connected to input of the crystal resonator and one end of the resistor, and have their drains connected to output of the crystal resonator and another end of the resistor. The capacitors are connected to two ends of the crystal resonator respectively and ground.
摘要翻译：一种晶体振荡器，包括：稳压单元，跨导单元，反馈电阻器，晶体谐振器和至少两个接地电容器。电压稳定单元包括电流源和包括串联连接的PMOS和NMOS的第一分支电路，PMOS的源极连接到电流源的输出端，PMOS和NMOS的栅极连接到其漏极，NMOS的源极连接到地面跨导单元包括串联连接的PMOS和NMOS的第二分支电路，PMOS的源极连接到稳压单元的输出端，PMOS和NMOS的栅极连接到晶体谐振器的输入端和电阻的一端，以及将其漏极连接到晶体谐振器的输出端和电阻器的另一端。电容器分别连接到晶体谐振器的两端并接地。

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