公开(公告)号：US20190372747A1

公开(公告)日：2019-12-05

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.

公开(公告)号：US10140229B2

公开(公告)日：2018-11-27

申请号：US14822175

申请日：2015-08-10

Applicant: Texas Instruments Incorporated

Inventor： Xiaoxi Zhang ,  Nikolaus Klemmer ,  Hunsoo Choo

IPC: G06F13/10 ,  G06F9/445 ,  G06F13/364 ,  G06F13/42 ,  G06F13/24

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.

公开(公告)号：US09998169B2

公开(公告)日：2018-06-12

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: H04B1/38 ,  H04B1/403 ,  H04L7/033 ,  H04B1/40

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：US09654326B2

公开(公告)日：2017-05-16

申请号：US15093724

申请日：2016-04-07

Applicant: Texas Instruments Incorporated

Inventor： Hunsoo Choo ,  Charles K. Sestok, IV

IPC: H04B1/38 ,  H04L25/49 ,  H04L27/36 ,  H04B1/30 ,  H04L27/38 ,  H04B17/14 ,  H04L7/033

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 LO drives upconversion, and an RX LO drives downconversion. TX/RX digital QMC compensators compensate for IQ mismatch (with optional DPD compensation), and QMC calibration is used 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 FBRX PLL. A QMC controller performs 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.

公开(公告)号：US20160308598A1

公开(公告)日：2016-10-20

申请号：US14941896

申请日：2015-11-16

Applicant: Texas Instruments Incorporated

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

IPC: H04B7/06

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.

Abstract translation: 描述了用于多个发射机之间的相位对准的系统和方法。 在一些实施例中，一种方法可以包括在RF发射机和RF接收机之间建立环路; 测量RF接收机的I和Q路径上的第一DC信号，而不在RF发射机的I和Q路径中插入DC信号; 在RF发射机的I和Q路径中插入非零DC信号，测量RF接收机的I和Q路径上的第二DC信号; 以及使用所述第一和第二DC信号来计算所述RF发射机和所述RF接收机之间的相对相位差。

公开(公告)号：US20160234055A1

公开(公告)日：2016-08-11

申请号：US15093724

申请日：2016-04-07

Applicant: Texas Instruments Incorporated

Inventor： Hunsoo Choo ,  Charles K. Sestok, IV

IPC: H04L27/36 ,  H04L7/033

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 LO drives upconversion, and an RX LO drives downconversion. TX/RX digital QMC compensators compensate for IQ mismatch (with optional DPD compensation), and QMC calibration is used 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 FBRX PLL. A QMC controller performs 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.

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 LO驱动上变频，RX LO驱动下变频。 TX / RX数字QMC补偿器补偿IQ失配（可选DPD补偿），QMC校准用于校准基于QMC校准程序的TX / RX QMC滤波器系数。 TX LO信号源是TX PLL，RX LO信号源选择性地是TX PLL或单独的FBRX PLL。 QMC控制器执行QMC校准，以生成校准的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。