公开(公告)号：US10009123B2

公开(公告)日：2018-06-26

申请号：US14941896

申请日：2015-11-16

Applicant: Texas Instruments Incorporated

Inventor： Fanlong Li ,  Hunsoo Choo ,  Kyung-wan Nam

IPC: H04K1/02 ,  H04L25/03 ,  H04L25/49 ,  H04B17/14 ,  H04B7/0413

CPC classification number: H04B17/14 ,  H04B7/0413

Abstract: Systems and methods for phase alignment among multiple transmitters are described. In some embodiments, a method may include creating a loop between an RF transmitter and an RF receiver; measuring a first DC signal on the I and Q paths of the RF receiver without inserting a DC signal in the I and Q paths of the RF transmitter; measuring a second DC signal on the I and Q paths of the RF receiver while inserting a non-zero DC signal in the I and Q paths of the RF transmitter; and calculating a relative phase difference between the RF transmitter and the RF receiver using the first and second DC signals.

公开(公告)号：US20160048470A1

公开(公告)日：2016-02-18

申请号：US14822175

申请日：2015-08-10

Applicant: Texas Instruments Incorporated

Inventor： Xiaoxi Zhang ,  Nikolaus Klemmer ,  Hunsoo Choo

IPC: G06F13/364 ,  G06F13/24 ,  G06F13/42

CPC classification number: G06F13/364 ,  G06F13/24 ,  G06F13/4282

Abstract: Triggered remote function calls can be used in master-slave systems to trigger slave-side software functions pre-loaded by a master into slave MCU memory, with associated parameters pre-loaded into a slave function interface memory. A master issues trigger-function signals (such as rising/falling edges or signal levels) over a trigger-function signal line. The slave includes a trigger conditioning block that in response issues a trigger-function request to the slave MCU, which calls/executes the associated software function, including accessing the associated trigger-function parameters from function interface memory. A slave can include a hardware function block with functionality configurable by a pre-loaded software configuration function (with associated parameters). A master can include a hardware function block configured to issue trigger-function signals. The slave (trigger conditioning block) can be configured to service trigger-function signals as an IRQ (interrupt request) to the MCU, which executes an ISR (interrupt service routine) as a triggered function call.

Abstract translation: 触发的远程功能调用可以在主从系统中使用，以将主机预加载的从机软件功能触发到从MCU存储器中，并将相关参数预加载到从功能接口存储器中。 主机通过触发功能信号线发出触发功能信号（如上升沿/下降沿或信号电平）。 从设备包括一个触发调节块，它响应发出一个触发功能请求给从MCU，从机MCU调用/执行相关的软件功能，包括从功能接口存储器访问相关的触发功能参数。 从机可以包括硬件功能块，其功能可通过预加载的软件配置功能（具有相关参数）配置。 主机可以包括配置为发出触发功能信号的硬件功能块。 从机（触发条件块）可以被配置为将触发功能信号作为IRQ（中断请求）提供给MCU，该MCU执行ISR（中断服务程序）作为触发的函数调用。

公开(公告)号：US09641317B2

公开(公告)日：2017-05-02

申请号：US14814197

申请日：2015-07-30

Applicant: Texas Instruments Incorporated

Inventor： Charles Kasimer Sestok, IV ,  Hunsoo Choo ,  Nikolaus Klemmer ,  Xiaoxi Zhang

IPC: H04B1/40 ,  H04L7/033 ,  H04B1/10 ,  H04B1/403

CPC classification number: H04B1/406 ,  H04B1/1027 ,  H04B1/403 ,  H04L7/0331

Abstract: A phase rotator corrects the IQ imbalance in a wireless transceiver. The phase rotator is a part of a compensation system that detects and separates reception impairment images from transmission impairment images. The disclosed phase rotator introduces a phase shift between the transmission channel and the reception channel without perturbing the phase mismatch and the gain mismatch in the reception path. The phase rotator includes a first local oscillation (LO) circuit that generates a first LO signal at a first carrier frequency and a second LO circuit that generates a second LO signal at a second carrier frequency that deviates from the first carrier frequency for a phase rotation period. The phase rotation period is sufficiently long such that the frequency deviation can introduce a prescribed phase shift between the first LO signal and the second LO signal.

公开(公告)号：US20160049984A1

公开(公告)日：2016-02-18

申请号：US14822867

申请日：2015-08-10

Applicant: Texas Instruments Incorporated

Inventor： Hunsoo Choo ,  Charles K. Sestok, IV

IPC: H04B1/403 ,  H04L27/36

CPC classification number: H04L27/364 ,  H04B1/30 ,  H04B17/14 ,  H04L7/0331 ,  H04L27/3863

Abstract: A direct conversion wireless transceiver is configured for TX/FBRX sequential QMC calibration (coefficient generation) using separate/shared PLLs. A TX path includes a TX LO driving upconversion, and an FBRX path includes an RX LO driving downconversion. TX/RX digital compensators include TX/RX QMC compensators that perform QMC compensation to compensate for IQ mismatch based on TX/RX QMC filter coefficients, and QMC calibration to calibrate the TX/RX QMC filter coefficients based on a QMC calibration procedure. The TX LO signal source is a TX PLL, and the RX LO signal source is selectively the TX PLL or a separate RX PLL. A QMC controller perform QMC calibration to generate calibrated TX/FBRX QMC filter coefficients, including: disconnecting the TX PLL from, and connecting the FBRX PLL to, the RX LO; generating calibrated TX QMC filter coefficients; generating calibrated FBRX QMC filter coefficients; disconnecting the FBRX PLL from, and connecting the TX PLL to, the RX LO; generating re-calibrated FBRX QMC filter coefficients. The TX digital compensator can be configured to perform DPD compensation (after QMC compensation).

Abstract translation: 直接转换无线收发器配置为使用单独/共享PLL的TX / FBRX顺序QMC校准（系数生成）。 TX路径包括TX LO驱动上变频，并且FBRX路径包括RX LO驱动下变频。 TX / RX数字补偿器包括基于TX / RX QMC滤波器系数执行QMC补偿以补偿IQ失配的TX / RX QMC补偿器，以及基于QMC校准过程校准TX / RX QMC滤波器系数的QMC校准。 TX LO信号源是TX PLL，RX LO信号源选择性地是TX PLL或单独的RX PLL。 QMC控制器执行QMC校准，以产生校准的TX / FBRX QMC滤波器系数，包括：断开TX PLL，并将FBRX PLL连接到RX LO; 生成校准的TX QMC滤波器系数; 产生校准的FBRX QMC滤波器系数; 断开FBRX PLL，并将TX PLL连接到RX LO; 产生重新校准的FBRX QMC滤波器系数。 TX数字补偿器可以配置为执行DPD补偿（QMC补偿后）。

公开(公告)号：US20160050035A1

公开(公告)日：2016-02-18

申请号：US14824062

申请日：2015-08-11

Applicant: Texas Instruments Incorporated

Inventor： Hunsoo Choo ,  Hamid Safiri ,  Nikolaus Klemmer

IPC: H04B17/21 ,  H04B17/318 ,  H04B17/23

CPC classification number: H04B17/21 ,  H04B17/23 ,  H04B17/318

Abstract: A signal profiler generates and monitors a signal profile corresponding to signal power (absolute or relative) per frequency band. The signal profiler includes a signal profile generator and a signal profile monitor. The signal profile generator processes a received signal in pre-defined frequency bands, and captures frequency-band signal power information into frequency bins, this frequency-binned signal power information constituting a signal profile. The signal profile monitor monitors the signal profile, including variations in the signal profile based on pre-defined criteria, and output corresponding profile-variation information (such as flags or interrupt requests). The signal profile generator is an FFT engine. The signal profile monitor is an FSM (finite state machine). An example application is use in a direct conversion wireless receiver to monitor relative image channel power as a signal profile variation that can be used to invoke QMC compensation/configuration.

Abstract translation: 信号剖析器产生并监视与每个频带的信号功率（绝对或相对）相对应的信号轮廓。 信号轮廓仪包括信号轮廓发生器和信号轮廓监视器。 信号分布发生器处理预定义频带中的接收信号，并将频带信号功率信息捕获到频率仓中，该频率合成信号功率信息构成信号分布。 信号配置文件监视器监视信号配置文件，包括基于预定义标准的信号配置文件的变化，并输出相应的配置文件变化信息（如标志或中断请求）。 信号分布生成器是FFT引擎。 信号轮廓监视器是FSM（有限状态机）。 示例应用在直接转换无线接收机中用于监视相对图像信道功率，作为可用于调用QMC补偿/配置的信号轮廓变化。

公开(公告)号：US20160036486A1

公开(公告)日：2016-02-04

申请号：US14814197

申请日：2015-07-30

Applicant: Texas Instruments Incorporated

Inventor： Charles Kasimer Sestok, IV ,  Hunsoo Choo ,  Nikolaus Klemmer ,  Xiaoxi Zhang

IPC: H04B1/403 ,  H04L7/033 ,  H04B1/10

CPC classification number: H04B1/406 ,  H04B1/1027 ,  H04B1/403 ,  H04L7/0331

Abstract: A phase rotator corrects the IQ imbalance in a wireless transceiver. The phase rotator is a part of a compensation system that detects and separates reception impairment images from transmission impairment images. The disclosed phase rotator introduces a phase shift between the transmission channel and the reception channel without perturbing the phase mismatch and the gain mismatch in the reception path. The phase rotator includes a first local oscillation (LO) circuit that generates a first LO signal at a first carrier frequency and a second LO circuit that generates a second LO signal at a second carrier frequency that deviates from the first carrier frequency for a phase rotation period. The phase rotation period is sufficiently long such that the frequency deviation can introduce a prescribed phase shift between the first LO signal and the second LO signal.

Abstract translation: 相位旋转器校正无线收发器中的IQ不平衡。 相位旋转器是检测和分离接收损伤图像与传输损伤图像的补偿系统的一部分。 所公开的相位旋转器在传输信道和接收信道之间引入相移，而不会扰乱接收路径中的相位失配和增益失配。 相位旋转器包括以第一载波频率产生第一LO信号的第一本地振荡（LO）电路和产生第二载波频率的第二LO信号，该第二LO信号偏离第一载波频率用于相位旋转 期。 相位旋转周期足够长，使得频率偏差可以在第一LO信号和第二LO信号之间引入规定的相移。

公开(公告)号：US20180269995A1

公开(公告)日：2018-09-20

申请号：US15987256

申请日：2018-05-23

Applicant: Texas Instruments Incorporated

Inventor： Fanlong Li ,  Hunsoo Choo ,  Kyung-wan Nam

IPC: H04B17/14 ,  H04B7/0413

CPC classification number: H04B17/14 ,  H04B7/0413

Abstract: Systems and methods for phase alignment among multiple transmitters are described. In some embodiments, a method may include creating a loop between an RF transmitter and an RF receiver; measuring a first DC signal on the I and Q paths of the RF receiver without inserting a DC signal in the I and Q paths of the RF transmitter; measuring a second DC signal on the I and Q paths of the RF receiver while inserting a non-zero DC signal in the I and Q paths of the RF transmitter; and calculating a relative phase difference between the RF transmitter and the RF receiver using the first and second DC signals.

公开(公告)号：US10033427B2

公开(公告)日：2018-07-24

申请号：US14737191

申请日：2015-06-11

Applicant: Texas Instruments Incorporated

Inventor： Hunsoo Choo ,  Nikolaus Klemmer ,  Jaiminkumar Mehta

IPC: H04B1/46 ,  H04B1/525 ,  H03D3/00 ,  H04B1/30

Abstract: A system for reducing a local oscillator leakage component. The system includes a transmitter channel to transmit data modulated using a transmitter local oscillator frequency. A transmitted signal includes a transmitter local oscillator leakage component. The system also includes a receiver channel to receive the transmitted signal using a receiver local oscillator signal having a frequency offset from the transmitter local oscillator frequency. The received signal includes the transmitter local oscillator leakage component isolated from one or more receiver impairments. The system further includes a feedback loop from the receiver channel to the transmitter channel to identify a power of the isolated transmitter local oscillator leakage component and to generate a local oscillator leakage cancellation signal based on the identified power.

公开(公告)号：US20170195002A1

公开(公告)日：2017-07-06

申请号：US15466418

申请日：2017-03-22

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Charles Kasimer Sestok, IV ,  Hunsoo Choo ,  Nikolaus Klemmer ,  Xiaoxi Zhang

IPC: H04B1/403 ,  H04L7/033

CPC classification number: H04B1/406 ,  H04B1/1027 ,  H04B1/403 ,  H04L7/0331

Abstract: A phase rotator corrects the IQ imbalance in a wireless transceiver. The phase rotator is a part of a compensation system that detects and separates reception impairment images from transmission impairment images. The disclosed phase rotator introduces a phase shift between the transmission channel and the reception channel without perturbing the phase mismatch and the gain mismatch in the reception path. The phase rotator includes a first local oscillation (LO) circuit that generates a first LO signal at a first carrier frequency and a second LO circuit that generates a second LO signal at a second carrier frequency that deviates from the first carrier frequency for a phase rotation period. The phase rotation period is sufficiently long such that the frequency deviation can introduce a prescribed phase shift between the first LO signal and the second LO signal.

公开(公告)号：US10536258B2

公开(公告)日：2020-01-14

申请号：US15996444

申请日：2018-06-02

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Hunsoo Choo ,  Hamid Safiri ,  Nikolaus Klemmer ,  Jaimin Mehta ,  Srinadh Madhavapeddi ,  Charles Kasimer Sestok ,  Vijayavardhan Baireddy

IPC: H04L7/00 ,  G06F1/10

Abstract: Multi-domain clock generation with skew compensation is based on free-running counters in each of the multiple clock domains. Multi-domain clock generation circuitry provides at least first and second domain clocks generated with randomization, each based on an input clock with an input clock frequency, the domain clocks having a relative clock skew that is varied over time in magnitude and direction. A first circuit in a first clock domain, configured for operation with the first domain clock, includes a first free-running counter with a pre-defined first selected roll-over count, to generate a first free-running count (N1(k)) based on the first domain clock. A second circuit in a second clock domain is configured for operation with the second domain clock, and includes a second free-running counter with a pre-defined second selected roll-over count, to generate a second free-running count (N2(k)) based on the second domain clock.