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1. 发明授权

US07312654B2 Quiet power up and power down of a digital audio amplifier 有权
标题翻译：数字音频放大器的安静上电和掉电
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。

2. 发明申请

US20110051833A1 TRANSMITTER SIGNAL INJECTION COMPENSATION 有权
标题翻译：发射机信号注入补偿
公开(公告)号：US20110051833A1
公开(公告)日：2011-03-03
申请号：US12551495
申请日：2009-08-31
申请人： Pallab Midya , Patrick L. Rakers , William J. Roeckner
发明人： Pallab Midya , Patrick L. Rakers , William J. Roeckner
IPC分类号： H04L1/02 , H04L5/16 , H04B1/10
CPC分类号： H04B1/525
摘要： A transceiver mitigates signal leakage into a receive path from a transmit path. A subtraction circuit determines a difference between a receive signal and a compensation signal to produce a compensated receive signal prior to demodulation by a demodulator. An equalizer both amplitude adjusts and phase adjusts orthogonal baseband transmit signals based on the difference from the subtraction circuit to produce the compensation signal. A digital tuning circuit determines at least one amplitude adjust coefficient to be used by the equalizer. The equalizer can have a polarity switch or a variable attenuator or a variable delay.
摘要翻译：收发信机从发送路径减轻信号泄漏到接收路径。减法电路确定接收信号和补偿信号之间的差异，以在由解调器解调之前产生经补偿的接收信号。均衡器两者都基于与减法电路的差异来调整和相位调整正交基带发射信号，产生补偿信号。数字调谐电路确定要由均衡器使用的至少一个幅度调整系数。均衡器可以具有极性开关或可变衰减器或可变延迟。

3. 发明授权

US06665338B1 Circuitry for converting a sampled digital signal to a naturally sampled digital signal and method therefor 有权
标题翻译：用于将采样的数字信号转换为自然采样的数字信号的电路及其方法
公开(公告)号：US06665338B1
公开(公告)日：2003-12-16
申请号：US09478024
申请日：2000-01-05
申请人： Pallab Midya , Patrick L. Rakers , William J. Roeckner
发明人： Pallab Midya , Patrick L. Rakers , William J. Roeckner
IPC分类号： H03K908
CPC分类号： H03F3/217 , H03K7/08 , H03M5/08
摘要： Embodiments of the present invention deal generally with circuitry and methods for converting a sampled digital signal (32) to a naturally sampled digital signal (34). One embodiment relating to a method includes receiving the sampled digital signal, calculating a duty ratio estimate (33) using feedback (52), and using interpolation (62) to determine the naturally sampled digital signal. Circuitry for converting a sampled digital signal (32) to a naturally sampled digital signal (34) includes a natural sampler, where the natural sampler includes an input to receive the sampled digital signal (32) and an input to receive a feedback signal (52). The natural sampler has an output to provide the naturally sampled digital signal (34). In one embodiment, the natural sampler calculates a duty ratio (33) using the feedback signal (52) and uses interpolation to determine the naturally sampled digital signal (34).
摘要翻译：本发明的实施例总体上涉及将采样数字信号（32）转换为自然采样的数字信号（34）的电路和方法。与方法相关的一个实施例包括接收采样的数字信号，使用反馈（52）计算占空比估计（33），并使用内插（62）来确定自然采样的数字信号。用于将采样数字信号（32）转换为自然采样数字信号（34）的电路包括自然采样器，其中自然采样器包括用于接收采样数字信号（32）的输入端和接收反馈信号（52 ）。自然采样器具有输出以提供自然采样的数字信号（34）。在一个实施例中，自然采样器使用反馈信号（52）计算占空比（33），并使用内插来确定自然采样的数字信号（34）。

4. 发明授权

US06965339B2 Method and system for analog to digital conversion using digital pulse width modulation (PWM) 有权
标题翻译：使用数字脉宽调制（PWM）模数转换的方法和系统
公开(公告)号：US06965339B2
公开(公告)日：2005-11-15
申请号：US10819644
申请日：2004-04-07
申请人： Pallab Midya , Matthew R. Miller , Patrick L. Rakers
发明人： Pallab Midya , Matthew R. Miller , Patrick L. Rakers
IPC分类号： H03M1/12 , H03M1/34 , H03M3/02
CPC分类号： H03M3/00
摘要： A system and method for analog-to-digital conversion using digital pulse width modulation (PWM) is disclosed. The method and system according to the disclosed invention converts an analog input signal to a digital signal in pulse code modulated (PCM) form. The disclosed invention uses a feedback circuit to perform PWM of the analog input signal. The PWM signal is then decimated to obtain the digital signal in PCM form. The system according to the disclosed invention requires lower operating frequency and dissipates lesser power than prior art systems providing the same sampling frequency and resolution. The operation at a lower frequency is achieved by obtaining two samples from every pulse of the PWM signal; the first sample being obtained from the right duty ratio, and the second sample being obtained form the left duty ratio. Further, the disclosed invention has lesser implementation complexity and higher signal-to-noise ratio than prior art.
摘要翻译：公开了一种使用数字脉宽调制（PWM）进行模数转换的系统和方法。根据所公开的发明的方法和系统将模拟输入信号转换成脉冲编码调制（PCM）形式的数字信号。所公开的发明使用反馈电路来执行模拟输入信号的PWM。然后抽取PWM信号以获得PCM形式的数字信号。根据所公开的发明的系统需要更低的工作频率并且消耗比提供相同采样频率和分辨率的现有技术系统更小的功率。通过从PWM信号的每个脉冲获得两个采样来实现较低频率的操作; 从正确的占空比获得第一个样品，并且从左占空比获得第二个样品。此外，所公开的发明比现有技术具有较小的实现复杂度和更高的信噪比。

5. 发明申请

US20090051441A1 LOW-NOISE AMPLIFIER 有权
标题翻译：低噪声放大器
公开(公告)号：US20090051441A1
公开(公告)日：2009-02-26
申请号：US11895427
申请日：2007-08-24
申请人： Jason H. Branch , Lawrence E. Connell , Patrick L. Rakers , Poojan A Wagh
发明人： Jason H. Branch , Lawrence E. Connell , Patrick L. Rakers , Poojan A Wagh
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。

6. 发明授权

US07177616B2 High linearity and low noise CMOS mixer and signal mixing method 有权
标题翻译：高线性度和低噪声CMOS混频器和信号混合方法
公开(公告)号：US07177616B2
公开(公告)日：2007-02-13
申请号：US10917891
申请日：2004-08-13
申请人： Lawrence E. Connell , Yan Cui , Poojan A. Wagh , Patrick L. Rakers
发明人： Lawrence E. Connell , Yan Cui , Poojan A. Wagh , Patrick L. Rakers
IPC分类号： G06F3/033 , H04B1/18
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。

7. 发明授权

US07495515B1 Low-noise amplifier 有权
标题翻译：低噪声放大器
公开(公告)号：US07495515B1
公开(公告)日：2009-02-24
申请号：US11895427
申请日：2007-08-24
申请人： Jason H. Branch , Lawrence E. Connell , Patrick L. Rakers , Poojan A. Wagh
发明人： Jason H. Branch , Lawrence E. Connell , Patrick L. Rakers , Poojan A. Wagh
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。

8. 发明申请

US20120252396A1 Linearization Technique for Mixer 有权
标题翻译：搅拌机线性化技术
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
IPC分类号： H04B1/16 , H03K17/16
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。

9. 发明授权

US07706765B2 Method and device for enabling and disabling group transmissions 有权
标题翻译：启用和禁用组传输的方法和设备
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。

10. 发明授权

US07653678B2 Direct digital synthesis circuit 有权
标题翻译：直接数字合成电路
公开(公告)号：US07653678B2
公开(公告)日：2010-01-26
申请号：US11457380
申请日：2006-07-13
申请人： Michael L. Bushman , Neal W. Hollenbeck , Patrick L. Rakers
发明人： Michael L. Bushman , Neal W. Hollenbeck , Patrick L. Rakers
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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