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公开(公告)号：US20090051441A1
公开(公告)日：2009-02-26
申请号：US11895427
申请日：2007-08-24
IPC分类号： H03F3/191
CPC分类号： H03F3/191 , H03F1/56 , H03F3/45192 , H03F2200/213 , H03F2200/294 , H03F2203/45386 , H03F2203/45544
摘要： Methods and corresponding systems in a low noise amplifier include selecting a selected sub-band for amplifying, wherein the selected sub-band is one of a plurality of sub-bands, wherein each sub-band is a portion of a frequency band, and wherein each sub-band has a corresponding sub-band center frequency. Next, a gate-source capacitor is adjusted so that a real part of an LNA input impedance corresponds to a real part of a source impedance at the selected sub-band center frequency. A match capacitor is also adjusted so that the LNA input impedance corresponds to the complex conjugate of the source impedance at the selected sub-band center frequency. The gate-source capacitor and the match capacitor can each be adjusted by recalling capacitor values from memory that correspond to the selected sub-band, and connecting selected capacitor components in response to the recalled capacitor values.
摘要翻译： 低噪声放大器中的方法和对应系统包括选择用于放大的所选择的子带，其中所选择的子带是多个子带中的一个，其中每个子带是频带的一部分，并且其中 每个子带具有相应的子带中心频率。 接下来，调整栅极 - 源极电容器，使得LNA输入阻抗的实部对应于所选择的子带中心频率处的源极阻抗的实部。 还调整匹配电容器，使得LNA输入阻抗对应于所选子带中心频率处的源阻抗的复共轭。 可以通过从对应于所选择的子带的存储器调用电容器值来调整栅极 - 源极电容器和匹配电容器，并且响应于调用的电容器值连接所选择的电容器部件。
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公开(公告)号：US07495515B1
公开(公告)日：2009-02-24
申请号：US11895427
申请日：2007-08-24
IPC分类号： H03F3/04
CPC分类号： H03F3/191 , H03F1/56 , H03F3/45192 , H03F2200/213 , H03F2200/294 , H03F2203/45386 , H03F2203/45544
摘要： Methods and corresponding systems in a low noise amplifier include selecting a selected sub-band for amplifying, wherein the selected sub-band is one of a plurality of sub-bands, wherein each sub-band is a portion of a frequency band, and wherein each sub-band has a corresponding sub-band center frequency. Next, a gate-source capacitor is adjusted so that a real part of an LNA input impedance corresponds to a real part of a source impedance at the selected sub-band center frequency. A match capacitor is also adjusted so that the LNA input impedance corresponds to the complex conjugate of the source impedance at the selected sub-band center frequency. The gate-source capacitor and the match capacitor can each be adjusted by recalling capacitor values from memory that correspond to the selected sub-band, and connecting selected capacitor components in response to the recalled capacitor values.
摘要翻译： 低噪声放大器中的方法和对应系统包括选择用于放大的所选择的子带，其中所选择的子带是多个子带中的一个，其中每个子带是频带的一部分，并且其中 每个子带具有相应的子带中心频率。 接下来，调整栅极 - 源极电容器，使得LNA输入阻抗的实部对应于所选择的子带中心频率处的源极阻抗的实部。 还调整匹配电容器，使得LNA输入阻抗对应于所选子带中心频率处的源阻抗的复共轭。 可以通过从对应于所选择的子带的存储器调用电容器值来调整栅极 - 源极电容器和匹配电容器，并且响应于调用的电容器值连接所选择的电容器部件。
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公开(公告)号：US07177616B2
公开(公告)日：2007-02-13
申请号：US10917891
申请日：2004-08-13
CPC分类号： H03D7/1441 , H03D7/1458 , H03D7/1466 , H03D2200/0025 , H03D2200/0088 , H04B1/30
摘要： Method and apparatus are provided for high linearity and low noise communication signal mixing. The apparatus includes a high linearity low noise mixer having an input stage coupled to a switch stage by a series-coupled blocking capacitance and input resistance. The input stage includes a buffer with negative feedback, and the switch stage includes a transistor based switch network connected to an amplifier that has feedback resistance and shunting capacitance. The method includes AC coupling an RF signal, increasing a gain of the RF signal, reducing third-order distortion by negatively feeding-back the RF signal, blocking IM2 generated from said gain increasing step, increasing a second-order input intercept point (IIP2) by attenuating the RF signal across a resistance, and applying a local oscillator input to the RF signal.
摘要翻译： 提供了高线性度和低噪声通信信号混合的方法和装置。 该装置包括具有通过串联耦合的阻塞电容和输入电阻耦合到开关级的输入级的高线性度低噪声混合器。 输入级包括具有负反馈的缓冲器，并且开关级包括连接到具有反馈电阻和分流电容的放大器的基于晶体管的开关网络。 该方法包括AC耦合RF信号，增加RF信号的增益，通过负反馈RF信号减少三阶失真，阻止从所述增益增加步骤产生的IM2，增加二阶输入截点（IIP2 ），通过跨越电阻衰减RF信号，以及将本地振荡器输入施加到RF信号。
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公开(公告)号：US07312654B2
公开(公告)日：2007-12-25
申请号：US11314203
申请日：2005-12-20
申请人： William J. Roeckner , Pallab Midya , Patrick L. Rakers , Lawrence E. Connell , Daniel A. Mavencamp , Bradley C. Stewart
发明人： William J. Roeckner , Pallab Midya , Patrick L. Rakers , Lawrence E. Connell , Daniel A. Mavencamp , Bradley C. Stewart
IPC分类号： H03F3/38
CPC分类号： H03F3/2173 , H03F1/305 , H03F3/2171 , H03F3/72 , H03F2200/03 , H03F2200/351 , H03K17/161
摘要： A closed loop audio amplifier system and method of powering up/down the system without producing audible artifacts are provided. During power up, a prebias voltage is provided to each output connected to a speaker to increase the voltage to a nominal output level. High impedance switches are then driven at a 50% duty cycle. Feedback from the output is supplied to a servo, which is enabled to fine tune the output voltage. Low impedance switches are then driven at a 50% duty cycle at a quarter cycle timing. The order of the feedback loop depends on which of the high or low impedance switches are driven. The prebias voltage is then removed before audio signals to be amplified are supplied to the system. Timing of driving of the switches is programmable. To power down, essentially the reverse sequence is provided.
摘要翻译： 提供一种闭环音频放大器系统以及在不产生可听见的伪影的情况下对系统加电/下电的方法。 在上电期间，向连接到扬声器的每个输出端提供预偏置电压以将电压增加到额定输出电平。 然后以50％占空比驱动高阻抗开关。 输出端的反馈信号被提供给一个伺服控制器，可以对输出电压进行微调。 然后，在四分之一周期的时间，以50％的占空比驱动低阻抗开关。 反馈环路的顺序取决于驱动高阻抗或低阻抗开关中的哪一个。 然后在将要放大的音频信号提供给系统之前，去除预偏置电压。 开关的驱动时序是可编程的。 为了断电，基本上提供了相反的顺序。
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公开(公告)号：US20120252396A1
公开(公告)日：2012-10-04
申请号：US13078502
申请日：2011-04-01
申请人： Haolu Xie , Manish N. Shah , Patrick L. Rakers
发明人： Haolu Xie , Manish N. Shah , Patrick L. Rakers
CPC分类号： H04B1/28 , H03D2200/0074 , H03D2200/0088 , H03K2217/0054
摘要： A technique for improving the linearity of a mixer is disclosed. A converter may include a mixer comprising a first metal-oxide semiconductor field-effect transistor (MOSFET) having a gate, a first conducting terminal coupled to an input of the converter, and a second conducting terminal coupled to an output of the converter, and a mixer driver having a first output coupled to the gate of the first MOSFET, the mixer driver configured to receive a local-oscillator signal having a first phase and a second phase, drive the first MOSFET off during the first phase of the local-oscillator signal, drive the first MOSFET on for a first period of time in response to a transition from the first phase of the local-oscillator signal to the second phase of the local-oscillator signal, and force the gate of the first MOSFET into a high impedance state for a second period of time during the second phase of the local-oscillator signal and after the expiration of the first period of time.
摘要翻译： 公开了一种改善混频器线性度的技术。 A转换器可以包括混合器，其包括具有栅极的第一金属氧化物半导体场效应晶体管（MOSFET），耦合到转换器的输入端的第一导电端子和耦合到转换器的输出端的第二导通端子，以及 混频器驱动器，其具有耦合到第一MOSFET的栅极的第一输出，混频器驱动器被配置为接收具有第一相位和第二相位的本地振荡器信号，在本机振荡器的第一阶段期间驱动第一MOSFET关断 信号，响应于从本地振荡器信号的第一相到本地振荡器信号的第二相的转变，驱动第一MOSFET导通第一时间段，并迫使第一MOSFET的栅极变为高电平 在本地振荡器信号的第二阶段期间和在第一时间段到期之后的第二时间段的阻抗状态。
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公开(公告)号：US07706765B2
公开(公告)日：2010-04-27
申请号：US09981476
申请日：2001-10-17
申请人： Timothy James Collins , Richard Stanley Rachwalski , Patrick L. Rakers , David P. Gurney , Stephen L. Kuffner
发明人： Timothy James Collins , Richard Stanley Rachwalski , Patrick L. Rakers , David P. Gurney , Stephen L. Kuffner
IPC分类号： H04L12/413 , H04L12/407
CPC分类号： H04L12/413
摘要： A source device (110) receives a carrier signal and continuously monitors the carrier signal for a first predetermined condition and a second predetermined condition. The source device (110) transmits data if the first predetermined condition is satisfied. The source device (110) ceases transmission of data if the first predetermined condition subsequently is not satisfied or if a second predetermined condition is satisfied.
摘要翻译： 源设备（110）接收载波信号并连续地监视载波信号的第一预定条件和第二预定条件。 如果满足第一预定条件，则源装置（110）发送数据。 如果第一预定条件不满足或满足第二预定条件，则源设备（110）停止数据传输。
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公开(公告)号：US07653678B2
公开(公告)日：2010-01-26
申请号：US11457380
申请日：2006-07-13
IPC分类号： G06G7/16
CPC分类号： G06G7/26
摘要： A direct digital synthesis circuit (108) includes a plurality of current sources (210, 211, 212), an output circuit (200), and a logical multiplier circuit (202). The output circuit (200) provides a synthesized waveform (164) output and includes a first (206) and second branch (208). The logical multiplier circuit (202) is operatively coupled to the plurality of current sources (210, 211, 212) and to the output circuit (200). The logical multiplier circuit (202) is operative to receive a plurality of signals. The logical multiplier circuit is also operative to selectively increase a first current flow through the first branch (206) by a determined magnitude and decrease a second current flow through the second branch (208) by the determined magnitude based on the plurality of signals. The synthesized waveform (164) is based on the first and second currents.
摘要翻译： 直接数字合成电路（108）包括多个电流源（210,211,212），输出电路（200）和逻辑乘法器电路（202）。 输出电路（200）提供输出的合成波形（164），并包括第一分支（206）和第二分支（208）。 逻辑乘法器电路（202）可操作地耦合到多个电流源（210,211,212）和输出电路（200）。 逻辑乘法器电路（202）可操作以接收多个信号。 逻辑乘法器电路还可操作以选择性地将通过第一分支（206）的第一电流流过确定的幅度，并且基于多个信号减少通过第二分支（208）的确定的幅度的第二电流。 合成波形（164）基于第一和第二电流。
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8.发明授权Method and apparatus for data backup and restoration in a portable data device 有权在便携式数据设备中进行数据备份和恢复的方法和装置公开(公告)号：US06317755B1
公开(公告)日：2001-11-13
申请号：US09360571
申请日：1999-07-26
IPC分类号： G06F1730
CPC分类号： G07F7/1008 , G06F11/1441 , G06Q20/341 , G06Q20/3576 , Y10S707/99955
摘要： A portable data device (300) having a memory (302) is provided. The memory (302) is segmented into a plurality of sectors (304-312). A backup memory buffer (312) and a plurality of applications (304-310) are programmed into the plurality of sectors, wherein the backup memory buffer (312) is jointly used by the plurality of applications (304-310). A valid state of data is stored in the backup memory buffer (312) prior to performing a transaction for a first application (304). The valid state of data is restored in the first application (304) upon power up of the portable data device (300) in an event the transaction is terminated prior to completion, wherein the step of restoring is independent of a next application in which a next transaction is performed.
摘要翻译： 提供具有存储器（302）的便携式数据设备（300）。 存储器（302）被分割成多个扇区（304-312）。 备份存储器缓冲器（312）和多个应用程序（304-310）被编程到多个扇区中，其中备用存储器缓冲器（312）由多个应用程序共同使用（304-310）。 在对第一应用执行交易之前，将有效的数据状态存储在备份存储器缓冲器（312）中（304）。 在事务在完成之前被终止的情况下，在便携式数据设备（300）上电时，在第一应用（304）中恢复数据的有效状态，其中恢复步骤独立于下一个应用 执行下一个事务。
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公开(公告)号：US08698664B2
公开(公告)日：2014-04-15
申请号：US13363884
申请日：2012-02-01
申请人： Omid Oliaei , Patrick L. Rakers
发明人： Omid Oliaei , Patrick L. Rakers
IPC分类号： H03M1/12
摘要： In accordance with embodiments of the present disclosure, a continuous-time incremental analog-to-digital converter (ADC) may include a plurality of resettable integrators and a feed-in gain element. Each integrator may be configured to convert a sum of signals received at its input to a signal indicative of an integral over time of the sum of signals. The plurality of integrators may include a first-stage integrator configured to receive at its input the baseband signal and a final-stage integrator configured to produce at its output a final-stage analog signal. The plurality of integrators may be arranged in a cascade configuration such that an output of each of the plurality of integrators other than the final-stage integrator is coupled to the input of a subsequent integrator. The feed-in gain element may be coupled between the input of the first-stage integrator and the input of another integrator of the plurality of integrators.
摘要翻译： 根据本公开的实施例，连续时间增量模数转换器（ADC）可以包括多个可复位积分器和馈入增益元件。 每个积分器可以被配置为将在其输入处接收的信号的和转换成指示信号总和的积分的信号。 多个积分器可以包括被配置为在其输入处接收基带信号的第一级积分器和被配置为在其输出端产生最终级模拟信号的最终级积分器。 多个积分器可以被布置成级联配置，使得除了最终级积分器之外的多个积分器中的每一个的输出耦合到后续积分器的输入。 馈入增益元件可以耦合在第一级积分器的输入端和多个积分器的另一个积分器的输入端之间。
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公开(公告)号：US08447246B2
公开(公告)日：2013-05-21
申请号：US13207786
申请日：2011-08-11
IPC分类号： H04B1/04
CPC分类号： H03D7/1441 , H03D7/1458 , H03D2200/0023 , H04B1/0057 , H04B1/0483
摘要： In accordance with some embodiments of the present disclosure, a multi-band transmitter comprises a plurality of band paths with each band path configured for a different frequency range. Each band path comprises a modulator configured to modulate a data signal onto a carrier signal associated with the frequency range of the band path to generate a radio frequency (RF) signal associated with the band path and frequency range of the band path. Each band path also comprises a step-down balun that includes an input coil configured to receive the RF signal from the modulator. Each band path further comprises a tuner configured to tune the input coil to the frequency range of the band path. The tuner is also configured to compensate for off-state conduction of switches of the tuner to reduce non-linear tuning effects of the balun associated with the off-state conduction.
摘要翻译： 根据本公开的一些实施例，多频带发射机包括多个频带路径，每个频带路径被配置用于不同的频率范围。 每个频带路径包括被配置为将数据信号调制到与频带路径的频率范围相关联的载波信号上以产生与频带路径的频带路径和频带范围相关联的射频（RF）信号的调制器。 每个频带路径还包括降压平衡 - 不平衡变压器，其包括被配置为从调制器接收RF信号的输入线圈。 每个频带路径还包括被配置为将输入线圈调谐到频带路径的频率范围的调谐器。 调谐器还被配置为补偿调谐器的开关的截止状态传导，以减少与断开状态传导相关联的平衡 - 不平衡变换器的非线性调谐效应。
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