公开(公告)号：US20150295749A1

公开(公告)日：2015-10-15

申请号：US14693416

申请日：2015-04-22

Applicant: Texas Instruments Incorporated

Inventor： Raghu Ganesan ,  Bijoy Bhukania ,  Jaiganesh Balakrishnan

IPC: H04L27/38 ,  H04B1/00

CPC classification number: H04L27/3863 ,  H04B1/0039

Abstract: Apparatus and methods disclosed herein perform gain, clipping, and phase compensation in the presence of I/Q mismatch in quadrature RF receivers. Gain and phase mismatch are exacerbated by differences in clipping between I & Q signals in low resolution ADCs. Signals in the stronger channel arm are clipped differentially more than weaker signals in the other channel arm. Embodiments herein perform clipping operations during iterations of gain mismatch calculations in order to balance clipping between the I and Q channel arms. Gain compensation coefficients are iteratively converged, clipping levels are established, and data flowing through the network is gain and clipping compensated. A compensation phase angle and phase compensation coefficients are then determined from gain and clipping compensated sample data. The resulting phase compensation coefficients are applied to the gain and clipping corrected receiver data to yield a gain, clipping, and phase compensated data stream.

Abstract translation: 在正交RF接收机中存在I / Q失配的情况下，本文公开的装置和方法执行增益，限幅和相位补偿。 由于低分辨率ADC中I＆Q信号之间的限幅差异，增益和相位失配加剧。 更强的信道臂中的信号比另一个信道臂中的较弱的信号差分地被削波。 本文实施例在增益失配计算的迭代期间执行削波操作，以平衡I和Q通道臂之间的限幅。 增益补偿系数迭代收敛，建立限幅电平，流经网络的数据得到增益和限幅补偿。 然后从增益和削波补偿采样数据确定补偿相位角和相位补偿系数。 所得到的相位补偿系数被应用于增益和限幅校正的接收机数据，以产生增益，限幅和相位补偿的数据流。

公开(公告)号：US20130229306A1

公开(公告)日：2013-09-05

申请号：US13850802

申请日：2013-03-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Saravana Kumar Ganeshan ,  Bijoy Bhukania ,  Anand Kannan

IPC: G01S19/33

CPC classification number: G01S19/33 ,  G01S19/37 ,  H04B1/0085

Abstract: A wireless receiver for multiple frequency bands reception includes a single receive radio frequency (RF) circuit (160, 170) having an RF bandpass substantially confined to encompass at least two non-overlapped such frequency bands at RF, a single in-phase and quadrature (approximately I, Q) pair of intermediate frequency (IF) sections (120I, 120Q) having an IF passband, and a mixer circuit (110) including an in-phase and quadrature (I,Q) pair of mixers (110I, 110Q) fed by said RF circuit (160, 170) and having a local oscillator (100) with in-phase and quadrature outputs coupled to said mixers (110I, 110Q) respectively, said mixer circuit (110) operable to inject and substantially overlap the at least two non-overlapped frequency bands with each other into the IQ IF sections (120I, 120Q) in the IF passband, the IF passband substantially confined to a bandwidth encompassing the thereby-overlapped frequency bands.

Abstract translation: 用于多个频带接收的无线接收器包括具有RF带通的单个接收射频（RF）电路（160,170），其基本上限制为在RF处包含至少两个非重叠的这样的频带，单个同相和正交 具有IF通带的中频（IFI）部分（IFI）部分（120I，120Q）以及包括同相和正交（I，Q）对混频器（110I，110Q）的混频器电路 ），并且具有分别耦合到所述混频器（110I，110Q）的同相和正交输出的本地振荡器（100），所述混频器电路（110）可操作地注入并基本上重叠 至少两个非重叠频带彼此分配到IF通带中的IQ IF部分（120I，120Q）中，IF通带基本上限于包含由此重叠的频带的带宽。

公开(公告)号：US20140301508A1

公开(公告)日：2014-10-09

申请号：US14309303

申请日：2014-06-19

Applicant: Texas Instruments Incorporated

Inventor： Bijoy Bhukania ,  Jawaharlal Tangudu ,  Karthik Ramasubramanian

IPC: H03G3/30

CPC classification number: H03G3/3036 ,  H03M1/185 ,  H04B1/1036 ,  H04B17/309 ,  H04B17/345 ,  H04L27/08

Abstract: Automatic gain control in a receiver. A method for controlling operating range of an analog-to-digital converter (ADC) by an automatic gain control circuit includes estimating a peak-to-average ratio corresponding to an analog signal from digital samples of the analog signal. The method includes determining a peak value corresponding to the analog signal based on the peak-to-average ratio. Further, the method includes maintaining magnitude of the analog signal at an input of the ADC and gain of the receiver based on the peak value.

公开(公告)号：US08604974B2

公开(公告)日：2013-12-10

申请号：US13850802

申请日：2013-03-26

Applicant: Texas Instruments Incorporated

Inventor： Saravana Kumar Ganeshan ,  Bijoy Bhukania ,  Anand Kannan

IPC: G01S19/33

CPC classification number: G01S19/33 ,  G01S19/37 ,  H04B1/0085

Abstract: An electronic circuit separates frequency-overlapped GLONASS and GPS overlapped in an approximately 4 MHz passband. The circuit uses a multiple-path analog-to-digital converter circuit (ADC). A sampling rate circuit is coupled to concurrently operate the analog-to-digital converter circuit at a sampling rate between about 60 Msps and about 80 Msps. A digital processing circuit includes storage defining complex de-rotation and low pass filtering. The digital processing circuit is fed by the analog-to-digital converter circuit and is operable A) to establish an access rate and respective distinct phase increments for the complex de-rotation, B) to execute the complex de-rotation by combinations of trigonometric multiplications using the distinct phase increments approximately concurrently and C) to execute the low pass filtering on the complex de-rotation resulting at the access rate and respective distinct phase increments, thus delivering GPS and Glonass signals separated from each other.

Abstract translation: 电子电路将频率重叠的GLONASS和GPS重叠在大约4MHz的通带中。 该电路使用多通道模数转换器电路（ADC）。 耦合采样率电路以以约60 Msps至约80 Msps的采样率并行操作模数转换器电路。 数字处理电路包括定义复数去旋转和低通滤波的存储器。 数字处理电路由模拟 - 数字转换器电路馈送并且可操作地A）建立访问速率和用于复位去旋转的相应的不同相位增量，B）通过三角形的组合来执行复数去旋转 使用不同相位增量大致并行地进行乘法，并且C）对复数去旋转执行低通滤波，导致访问速率和相应的不同相位增量，从而传送彼此分离的GPS和Glonass信号。

公开(公告)号：US09900205B2

公开(公告)日：2018-02-20

申请号：US14693416

申请日：2015-04-22

Applicant: Texas Instruments Incorporated

Inventor： Raghu Ganesan ,  Bijoy Bhukania ,  Jaiganesh Balakrishnan

IPC: H03D3/00 ,  H04L27/38 ,  H04B1/00

CPC classification number: H04L27/3863 ,  H04B1/0039

Abstract: Apparatus and methods disclosed herein perform gain, clipping, and phase compensation in the presence of I/Q mismatch in quadrature RF receivers. Gain and phase mismatch are exacerbated by differences in clipping between I & Q signals in low resolution ADCs. Signals in the stronger channel arm are clipped differentially more than weaker signals in the other channel arm. Embodiments herein perform clipping operations during iterations of gain mismatch calculations in order to balance clipping between the I and Q channel arms. Gain compensation coefficients are iteratively converged, clipping levels are established, and data flowing through the network is gain and clipping compensated. A compensation phase angle and phase compensation coefficients are then determined from gain and clipping compensated sample data. The resulting phase compensation coefficients are applied to the gain and clipping corrected receiver data to yield a gain, clipping, and phase compensated data stream.

公开(公告)号：US08787435B2

公开(公告)日：2014-07-22

申请号：US14047204

申请日：2013-10-07

Applicant: Texas Instruments Incorporated

Inventor： Bijoy Bhukania ,  Jawaharlal Tangudu ,  Karthik Ramasubramanian

IPC: H04B3/46 ,  H04B17/00 ,  H04Q1/20

CPC classification number: H03G3/3036 ,  H03M1/185 ,  H04B1/1036 ,  H04B17/309 ,  H04B17/345 ,  H04L27/08

Abstract: Automatic gain control in a receiver. A method for controlling operating range of an analog-to-digital converter (ADC) by an automatic gain control circuit includes estimating a peak-to-average ratio corresponding to an analog signal from digital samples of the analog signal. The method includes determining a peak value corresponding to the analog signal based on the peak-to-average ratio. Further, the method includes maintaining magnitude of the analog signal at an input of the ADC and gain of the receiver based on the peak value.

Abstract translation: 接收机自动增益控制。 用于通过自动增益控制电路控制模数转换器（ADC）的操作范围的方法包括从模拟信号的数字样本估计对应于模拟信号的峰均比。 该方法包括基于峰均比来确定与模拟信号相对应的峰值。 此外，该方法包括基于峰值来维持ADC的输入处的模拟信号的幅度和接收机的增益。

公开(公告)号：US08897401B2

公开(公告)日：2014-11-25

申请号：US14309303

申请日：2014-06-19

Applicant: Texas Instruments Incorporated

Inventor： Bijoy Bhukania ,  Jawaharlal Tangudu ,  Karthik Ramasubramanian

IPC: H04L27/06 ,  H03G3/30 ,  H04B1/10

CPC classification number: H03G3/3036 ,  H03M1/185 ,  H04B1/1036 ,  H04B17/309 ,  H04B17/345 ,  H04L27/08

Abstract: Automatic gain control in a receiver. A method for controlling operating range of an analog-to-digital converter (ADC) by an automatic gain control circuit includes estimating a peak-to-average ratio corresponding to an analog signal from digital samples of the analog signal. The method includes determining a peak value corresponding to the analog signal based on the peak-to-average ratio. Further, the method includes maintaining magnitude of the analog signal at an input of the ADC and gain of the receiver based on the peak value.

Abstract translation: 接收机自动增益控制。 用于通过自动增益控制电路控制模数转换器（ADC）的操作范围的方法包括从模拟信号的数字样本估计对应于模拟信号的峰均比。 该方法包括基于峰均比来确定与模拟信号相对应的峰值。 此外，该方法包括基于峰值来维持ADC的输入处的模拟信号的幅度和接收机的增益。

公开(公告)号：US20140036978A1

公开(公告)日：2014-02-06

申请号：US14047204

申请日：2013-10-07

Applicant: Texas Instruments Incorporated

Inventor： Bijoy Bhukania ,  Jawaharlal Tangudu ,  Karthik Ramasubramanian

IPC: H04B17/00

CPC classification number: H03G3/3036 ,  H03M1/185 ,  H04B1/1036 ,  H04B17/309 ,  H04B17/345 ,  H04L27/08

Abstract: Automatic gain control in a receiver. A method for controlling operating range of an analog-to-digital converter (ADC) by an automatic gain control circuit includes estimating a peak-to-average ratio corresponding to an analog signal from digital samples of the analog signal. The method includes determining a peak value corresponding to the analog signal based on the peak-to-average ratio. Further, the method includes maintaining magnitude of the analog signal at an input of the ADC and gain of the receiver based on the peak value.

Abstract translation: 接收机自动增益控制。 用于通过自动增益控制电路控制模数转换器（ADC）的操作范围的方法包括从模拟信号的数字样本估计对应于模拟信号的峰均比。 该方法包括基于峰均比来确定与模拟信号相对应的峰值。 此外，该方法包括基于峰值来维持ADC的输入处的模拟信号的幅度和接收机的增益。