公开(公告)号：US09859857B2

公开(公告)日：2018-01-02

申请号：US15488365

申请日：2017-04-14

Applicant: FCI Inc.

Inventor： SeongHun Jeong

IPC: H04B1/06 ,  H03F3/45 ,  H03G3/30 ,  H03F3/189

CPC classification number: H03G3/3052 ,  H03F3/19 ,  H03F3/45475 ,  H03F3/45973 ,  H03F2200/294 ,  H03F2203/45521 ,  H03G3/001 ,  H03G3/3068 ,  H03G2201/202 ,  H03G2201/40

Abstract: Disclosed herein is a DC offset cancellation circuit. The DC offset cancellation circuit includes a DC feedback unit configured to vary a DC feedback (DCFB) bandwidth to add at least one mid-bandwidth to the DCFB bandwidth and to provide a delay time in each case in order to reduce the DC droop error that occurs in switching from the high bandwidth (BW) to the mid-BW or from the mid-BW mode to the low BW mode, such that stable settling is ensured.

公开(公告)号：US20170310350A1

公开(公告)日：2017-10-26

申请号：US15644578

申请日：2017-07-07

Applicant: SOCIONEXT INC.

Inventor： Koichiro TANAKA ,  Takeaki WATANABE

IPC: H04B1/16 ,  H03F3/19 ,  H03G3/30

CPC classification number: H04B1/16 ,  H03F3/19 ,  H03F2200/294 ,  H03F2200/451 ,  H03G3/3036 ,  H03G3/3052 ,  H03G3/3078 ,  H03G2201/202 ,  H04B1/30

Abstract: An AGC circuit for a radio receiver includes a detector converting a high frequency signal into a baseband signal. To reduce generation of a DC offset, the AGC circuit includes: a variable gain amplifier having an amplifier circuit and a high-pass filter, the amplifier circuit amplifying the baseband signal with a variable gain and the high-pass filter coupled to the amplifier circuit and having a cut-off frequency which is variable; a controller supplying a gain control signal; and a blocker temporarily blocking the high frequency signal. Using the block control signal, the controller causes the blocker to start blocking the high frequency signal, before the cut-off frequency of the high-pass filter is switched from high to low.

公开(公告)号：US20140162581A1

公开(公告)日：2014-06-12

申请号：US13924760

申请日：2013-06-24

Applicant: Starkey Laboratories, Inc.

Inventor： Jeffrey Paul Solum

IPC: H04B1/10

CPC classification number: H04B1/1027 ,  H03G3/3052 ,  H03G2201/202 ,  H03G2201/206 ,  H04B1/109 ,  H04L27/3809

Abstract: One embodiment of the present subject matter includes a method of receiving an input signal. The method, in various embodiments, includes detecting a peak of the input signal and detecting an envelope of the input signal. In various embodiments, the peak and envelope are used to identify out-of-band blocking signals and to adjust gain control. The method also includes comparing the peak to a first threshold Tp and comparing the envelope to a second threshold Te. In the method, if the peak is above the first threshold and the envelope is below the second threshold, then ignoring the input signal. If the envelope is above the second threshold, the method includes applying automatic gain control to decode information encoded in the input signal.

Abstract translation: 本主题的一个实施例包括接收输入信号的方法。 在各种实施例中，该方法包括检测输入信号的峰值并检测输入信号的包络。 在各种实施例中，峰值和包络用于识别带外阻塞信号并调整增益控制。 该方法还包括将峰值与第一阈值Tp进行比较并将包络与第二阈值Te进行比较。 在该方法中，如果峰值高于第一阈值并且包络低于第二阈值，则忽略输入信号。 如果信封高于第二阈值，则该方法包括应用自动增益控制来对输入信号中编码的信息进行解码。

公开(公告)号：US20060274620A1

公开(公告)日：2006-12-07

申请号：US10908992

申请日：2005-06-03

Applicant: Bassel Haddad

Inventor： Bassel Haddad

IPC: G11B7/00

CPC classification number: H03G3/001 ,  H03G3/3052 ,  H03G2201/202

Abstract: An automatic gain control (AGC) controls the signal amplitude at the input to an analog to digital converter (ADC) input by applying a gain that produces a desired overall amplitude resolution of the patterns actually presented by the signal delivered by the ADC converter. Short RLL patterns will have sufficient resolution for reliable extraction as a result of having sufficient overall amplitude, which thereby strengthens the ability of the read channel to correctly extract data. Moreover, the system determines correct AGC settings responsive to measurements of user data parameters. The system also detects and corrects for DC offsets in the signal whose gain is controlled.

Abstract translation: 自动增益控制（AGC）通过施加增益来控制模数转换器（ADC）输入端的信号幅度，该增益产生由ADC转换器传送的信号实际呈现的模式的所需总体幅度分辨率。 由于具有足够的总体幅度，短的RLL图案将具有足够的分辨率以进行可靠的提取，从而增强读取通道正确提取数据的能力。 此外，系统根据用户数据参数的测量来确定正确的AGC设置。 该系统还检测和校正增益受控的信号中的直流偏移。

公开(公告)号：US06792282B1

公开(公告)日：2004-09-14

申请号：US09666698

申请日：2000-09-21

Applicant: William J. Domino ,  Dmitriy Rozenblit ,  Morten Damgaard ,  Nooshin D. Vakilian

Inventor： William J. Domino ,  Dmitriy Rozenblit ,  Morten Damgaard ,  Nooshin D. Vakilian

IPC: H04B102

CPC classification number: H03G3/3047 ,  H03G2201/103 ,  H03G2201/202 ,  H03G2201/206 ,  H03G2201/307

Abstract: A translation loop modulator and power amplifier in a phase and amplitude modulated transmission environment includes a translation loop having a phase locked loop and that is configured to receive a first modulated signal (PM) and that is also configured to provide a frequency specific modulated signal. The invention also includes a power amplifier configured to receive the frequency specific modulated signal, a variable gain element configured to provide a second modulated signal (AM) to the power amplifier and a switching element configured to receive a portion of an output of the translation loop and a portion of an output power of the power amplifier. The switching element is configured to apply the output portion of the translation loop to an input of the translation loop during a first time period and apply the detected output power portion of the power amplifier to the input of the translation loop during a second time period, thus allowing the phase locked loop in the translation loop to correct for any phase shift caused by the power amplifier.

Abstract translation: 在相位和幅度调制传输环境中的平移环路调制器和功率放大器包括具有锁相环的平移环路，并且被配置为接收第一调制信号（PM），并且还被配置为提供频率特定调制信号。 本发明还包括被配置为接收频率特定调制信号的功率放大器，被配置为向功率放大器提供第二调制信号（AM）的可变增益元件和被配置为接收转换回路的输出的一部分的开关元件 和功率放大器的输出功率的一部分。 开关元件被配置为在第一时间段期间将平移环路的输出部分施加到平移环路的输入端，并且在第二时间周期期间将功率放大器的检测输出功率部分施加到平移环路的输入端， 从而允许平移环路中的锁相环校正由功率放大器引起的任何相移。

公开(公告)号：US08472573B2

公开(公告)日：2013-06-25

申请号：US13193255

申请日：2011-07-28

Applicant: Jeffrey Paul Solum

Inventor： Jeffrey Paul Solum

IPC: H04L27/08

CPC classification number: H04B1/1027 ,  H03G3/3052 ,  H03G2201/202 ,  H03G2201/206 ,  H04B1/109 ,  H04L27/3809

Abstract: One embodiment of the present subject matter includes a method of receiving an input signal. The method, in various embodiments, includes detecting a peak of the input signal and detecting an envelope of the input signal. In various embodiments, the peak and envelope are used to identify out-of-band blocking signals and to adjust gain control. The method also includes comparing the peak to a first threshold Tp and comparing the envelope to a second threshold Te. In the method, if the peak is above the first threshold and the envelope is below the second threshold, then ignoring the input signal. If the envelope is above the second threshold, the method includes applying automatic gain control to decode information encoded in the input signal.

公开(公告)号：US08301097B2

公开(公告)日：2012-10-30

申请号：US12115263

申请日：2008-05-05

Applicant: Hooman Darabi ,  Henrik T. Jensen ,  Brima Ibrahim

Inventor： Hooman Darabi ,  Henrik T. Jensen ,  Brima Ibrahim

IPC: H04B1/06 ,  H04B7/00

CPC classification number: H03G1/007 ,  H03G3/3063 ,  H03G2201/103 ,  H03G2201/202 ,  H03G2201/307

Abstract: A method for processing a plurality of signals may include amplifying an input signal and generating a wideband signal from the amplified input signal. The method may further include bandpass filtering the generated wideband signal to generate a narrowband signal, and adjusting amplification of the input signal based on a narrowband received signal strength indication of the generated narrowband signal, and/or a wideband received signal strength indication of the generated wideband signal. The amplified input signal may be downconverted to generate the wideband signal. The amplified input signal may be downconverted to an intermediate frequency (IF) and/or to a baseband signal to generate the wideband signal. At least one blocker signal may be bandpass filtered from the amplified input signal.

Abstract translation: 用于处理多个信号的方法可以包括放大输入信号并从放大的输入信号产生宽带信号。 该方法还可以包括对生成的宽带信号进行带通滤波以产生窄带信号，以及基于所生成的窄带信号的窄带接收信号强度指示和/或所生成的宽带信号强度指示来调整输入信号的放大 宽带信号。 放大的输入信号可以被下变频以产生宽带信号。 放大的输入信号可以下变频到中频（IF）和/或基带信号以产生宽带信号。 至少一个阻塞信号可以从放大的输入信号进行带通滤波。

公开(公告)号：US07593705B2

公开(公告)日：2009-09-22

申请号：US11287787

申请日：2005-11-28

Applicant: Tadahiro Sato ,  Akifumi Adachi

Inventor： Tadahiro Sato ,  Akifumi Adachi

IPC: H04B1/06 ,  H04Q7/20

CPC classification number: H03G3/3052 ,  H03G3/005 ,  H03G3/3078 ,  H03G3/3089 ,  H03G2201/103 ,  H03G2201/202 ,  H03G2201/305 ,  H04B1/707 ,  H04B2201/70701 ,  H04B2201/70706

Abstract: A radio receiver includes a branching unit, a first gain-control system, a second-gain control system, and a signal processing unit. The branching unit branches a radio signal received by the radio receiver into two signals. The first-gain control system performs a gain control of a pilot signal in one of branched signals, and the second gain control system performs a gain control of a data signal in another of the branched signals. The signal processing unit synchronizes frames in the received radio signal. The signal processing unit outputs a gain signal to each of the first gain-control system and the second gain-control system. The first gain-control system and the second gain-control system perform the gain controls based on the gain signal.

Abstract translation: 无线电接收机包括分支单元，第一增益控制系统，第二增益控制系统和信号处理单元。 分支单元将由无线电接收机接收的无线电信号分成两个信号。 第一增益控制系统以分支信号之一对导频信号进行增益控制，第二增益控制系统对分支信号中的另一个进行数据信号的增益控制。 信号处理单元同步所接收的无线电信号中的帧。 信号处理单元向第一增益控制系统和第二增益控制系统中的每一个输出增益信号。 第一增益控制系统和第二增益控制系统基于增益信号执行增益控制。

公开(公告)号：US07460623B1

公开(公告)日：2008-12-02

申请号：US10360834

申请日：2003-02-06

Applicant: Vladimir Radionov ,  Ryan Yu

Inventor： Vladimir Radionov ,  Ryan Yu

IPC: H04L27/08

CPC classification number: H03G3/3089 ,  H03G2201/202 ,  H03G2201/302

Abstract: A digital automatic gain control circuit is disclosed. The circuit includes a selector, a scaler, a detector, a gain adjustor and a controller. In one exemplary aspect, the selector receives an input signal having two components, namely, the in-phase (I) and quadrature (Q) components, in digital form. The selector then selects a subset of bits from each component based on a control signal provided by the controller. The two subsets are then forwarded to the scaler. The scaler then multiplies the two subsets respectively against a gain value to generate two multiplication results. A portion of each multiplication result is then provided as output by the scaler. The gain value and the subset selection are periodically adjusted in response to the scaler output. The adjustments with respect to the gain value and the subset selection are effectuated collectively by the detector, the gain adjustor and the controller.

Abstract translation: 公开了一种数字自动增益控制电路。 该电路包括选择器，定标器，检测器，增益调节器和控制器。 在一个示例性方面，选择器以数字形式接收具有两个分量的输入信号，即同相（I）和正交（Q）分量。 然后，选择器基于由控制器提供的控制信号从每个分量中选择一个比特的子集。 然后将两个子集转发到缩放器。 缩放器然后将两个子集分别乘以增益值以生成两个相乘结果。 然后将每个乘法结果的一部分作为缩放器的输出提供。 响应于缩放器输出周期性地调整增益值和子集选择。 相对于增益值和子集选择的调整由检测器，增益调节器和控制器共同实现。

公开(公告)号：US20070230635A1

公开(公告)日：2007-10-04

申请号：US11278527

申请日：2006-04-03

Applicant: Leif Wilhelmsson ,  Jim Svensson ,  Lars Sundstrom

Inventor： Leif Wilhelmsson ,  Jim Svensson ,  Lars Sundstrom

IPC: H04L27/08 ,  H04K1/10

CPC classification number: H04L27/2647 ,  H03G3/3052 ,  H03G2201/103 ,  H03G2201/202 ,  H03G2201/302 ,  H04L25/0202 ,  H04L27/2607

Abstract: In communication systems where the channel is expected to vary during a communication burst, gain adjustments during the communication burst can be implemented by automatic gain control (AGC) in the receiver, with minimal performance degradation. These gain adjustments are successfully accommodated by virtue of suitable information-sharing between an AGC unit and a digital baseband part. The digital baseband part can direct the AGC unit appropriately to ensure that gain adjustments are implemented during time intervals that do not carry substantive communication information (e.g., guard intervals). In receivers that perform channel estimation in the digital baseband part, the AGC unit supports channel estimation by informing the digital baseband part about the timing of the gain adjustment. The AGC unit can also support channel estimation by informing the digital baseband part about the size of the gain adjustment.

Abstract translation: 在通信期望信道在通信突发期间变化的通信系统中，通信突发期间的增益调整可以通过接收机中的自动增益控制（AGC）来实现，性能下降最小。 通过AGC单元和数字基带部分之间的合适的信息共享，可以成功地适应这些增益调整。 数字基带部分可以适当地引导AGC单元，以确保在不携带实质性通信信息（例如，保护间隔）的时间间隔期间实现增益调整。 在数字基带部分进行信道估计的接收机中，AGC单元通过向数字基带部分通知增益调整的定时来支持信道估计。 AGC单元还可以通过向数字基带部分通知增益调整的大小来支持信道估计。