公开(公告)号：US20070139103A1

公开(公告)日：2007-06-21

申请号：US11314203

申请日：2005-12-20

申请人： William Roeckner ,  Pallab Midya ,  Patrick Rakers ,  Lawrence Connell ,  Daniel Mavencamp ,  Bradley Stewart

发明人： William Roeckner ,  Pallab Midya ,  Patrick Rakers ,  Lawrence Connell ,  Daniel Mavencamp ,  Bradley 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。 断电 基本上提供了相反的顺序。

公开(公告)号：US20060035611A1

公开(公告)日：2006-02-16

申请号：US10917891

申请日：2004-08-13

申请人： Lawrence Connell ,  Yan Cui ,  Poojan Wagh ,  Patrick Rakers

发明人： Lawrence Connell ,  Yan Cui ,  Poojan Wagh ,  Patrick Rakers

IPC分类号： H04B7/00

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。

公开(公告)号：US20070161359A1

公开(公告)日：2007-07-12

申请号：US11329752

申请日：2006-01-10

申请人： Daniel McCarthy ,  Lawrence Connell

发明人： Daniel McCarthy ,  Lawrence Connell

IPC分类号： H04B1/06 ,  H04B7/00

CPC分类号： H03F1/26 ,  H03F3/345 ,  H03F3/45475 ,  H03F2200/211 ,  H03F2200/294 ,  H03F2200/372 ,  H03F2203/45512 ,  H03F2203/45551 ,  H03G3/3036 ,  H04W52/52

摘要： An amplifier and method of amplifying a signal is presented. The amplifier contains a fixed gain stage, a digitally controllable gain stage, and a continuously variable attenuator connected between the fixed and controllable gain stages. The attenuator and controllable gain stage are controllable such that the gain of the controllable gain stage is decreased when the attenuation of the attenuator reaches a predetermined maximum value and the attenuation of the attenuator is reduced thereafter. The output power level of the amplifier remains constant.

摘要翻译： 提出了放大器和放大信号的方法。 放大器包含固定增益级，数字可控增益级和连接在固定增益级与可控增益级之间的连续可变衰减器。 衰减器和可控增益级是可控的，使得当衰减器的衰减达到预定的最大值时，可控增益级的增益减小，此后衰减器的衰减减小。 放大器的输出功率电平保持不变。

公开(公告)号：US20070201581A1

公开(公告)日：2007-08-30

申请号：US11363463

申请日：2006-02-27

申请人： Poojan Wagh ,  Lawrence Connell ,  Matthew Miller

发明人： Poojan Wagh ,  Lawrence Connell ,  Matthew Miller

IPC分类号： H04L27/20

CPC分类号： H04L27/2071

摘要： An RF modulator supporting wide-band signals includes IQ modulation by interleaving the in-phase and quadrature signals. The modulator can be implemented using an integrated circuit having a baseband in-phase stage that receives an in-phase analog input signal, a baseband quadrature stage that receives a quadrature analog input signal, and a switching mixer having a plurality of switches. The switching mixer receives in-phase and quadrature signals from the baseband in-phase stage and the baseband quadrature stage. The switching mixer produces a differential signal combining the in-phase and quadrature signals by interleaving the signals over a plurality of phases of a carrier period.

摘要翻译： 支持宽带信号的RF调制器通过交织同相和正交信号来包括IQ调制。 可以使用具有接收同相模拟输入信号的基带同相级的集成电路，接收正交模拟输入信号的基带正交级和具有多个开关的开关混频器来实现调制器。 开关混频器从基带同相级和基带正交级接收同相和正交信号。 开关混频器通过在载波周期的多个相位上交织信号来产生组合同相和正交信号的差分信号。

公开(公告)号：US20070072569A1

公开(公告)日：2007-03-29

申请号：US11238657

申请日：2005-09-28

申请人： Daniel McCarthy ,  Lawrence Connell ,  Neal Hollenbeck

发明人： Daniel McCarthy ,  Lawrence Connell ,  Neal Hollenbeck

IPC分类号： H04B1/06 ,  H04B7/00

CPC分类号： H03G1/007 ,  H03G3/3063

摘要： A variable attenuator and method of attenuating a signal is presented. The variable attenuator contains an input that receives an input signal to be attenuated. A voltage divider between a resistor and parallel MOSFETs provides the attenuated input signal. The MOSFETs have different sizes and have gates that are connected to a control signal through different resistances such that the larger the MOSFET, the larger the resistance. The control signal is dependent on the output of the attenuator. The arrangement extends the linearity of the attenuation over a wide voltage range of the control signal and decreases the intermodulation distortion of the attenuator.

摘要翻译： 提出了一种衰减信号的可变衰减器和方法。 可变衰减器包含接收要衰减的输入信号的输入端。 电阻和并联MOSFET之间的分压器提供衰减的输入信号。 MOSFET具有不同的尺寸，并且具有通过不同电阻连接到控制信号的栅极，使得MOSFET越大，电阻越大。 控制信号取决于衰减器的输出。 该布置在控制信号的宽电压范围内延伸衰减的线性，并减小衰减器的互调失真。

公开(公告)号：US20060217101A1

公开(公告)日：2006-09-28

申请号：US11086045

申请日：2005-03-22

申请人： Lawrence Connell ,  David Kovac ,  Poojan Wagh ,  Vikram Karnani ,  William Waldie ,  Tao Wu

发明人： Lawrence Connell ,  David Kovac ,  Poojan Wagh ,  Vikram Karnani ,  William Waldie ,  Tao Wu

IPC分类号： H04B1/26

CPC分类号： H03D7/1441 ,  H03D7/1458 ,  H03D7/1466 ,  H03D7/165 ,  H03D2200/0084 ,  H03D2200/0088

摘要： Transmission of a high frequency signal is provided by a passive mixer. The passive mixer receives a low frequency signal as an input. The passive mixer includes a plurality of transistors each with a gate, a source, and a drain. The passive mixer also includes a local oscillator connected to the gates of the transistors. The gates of the transistors are also connected to a DC bias proportional to the threshold voltage of the transistors. In addition, an output of the passive mixer may be attenuated by a passive attenuator wherein both the passive attenuator and passive mixer are substantially free of quiescent current.

摘要翻译： 高频信号的传输由无源混频器提供。 无源混频器接收低频信号作为输入。 无源混频器包括多个晶体管，每个具有栅极，源极和漏极。 无源混频器还包括连接到晶体管的栅极的本地振荡器。 晶体管的栅极也连接到与晶体管的阈值电压成比例的DC偏置。 此外，无源混频器的输出可以被无源衰减器衰减，其中无源衰减器和无源混频器都基本上没有静态电流。

公开(公告)号：US20070216482A1

公开(公告)日：2007-09-20

申请号：US11374870

申请日：2006-03-14

申请人： Neal Hollenbeck ,  Lawrence Connell ,  Daniel McCarthy

发明人： Neal Hollenbeck ,  Lawrence Connell ,  Daniel McCarthy

IPC分类号： H03F3/45 ,  H03F3/191

CPC分类号： H03F1/26 ,  H03F1/32 ,  H03F3/191 ,  H03F3/45179 ,  H03F2200/211 ,  H03F2200/294 ,  H03F2200/372 ,  H03F2203/45306 ,  H03F2203/45616 ,  H03F2203/45726 ,  H03G1/0088 ,  H03G3/3052

摘要： An amplifier, tuner, and method of amplification are provided. The amplifier has a pair of transistors. Each transistor has a control terminal and an output terminal disposed between the transistor and a power supply input. A first network is connected between each power supply input and output terminal. The first network contains a first resistor and a first switch connected in parallel with the first resistor. A second network is connected between the transistors. The second network contains a first and second combination. Each of the first and second combinations contains a second resistor and a second switch connected in parallel with the second resistor. The first and second combinations are connected by a third switch.

摘要翻译： 提供放大器，调谐器和放大方法。 放大器有一对晶体管。 每个晶体管具有控制端子和设置在晶体管和电源输入端之间的输出端子。 第一个网络连接在每个电源输入和输出端子之间。 第一网络包含与第一电阻并联连接的第一电阻器和第一开关。 第二网络连接在晶体管之间。 第二网络包含第一和第二组合。 第一和第二组合中的每一个包括与第二电阻器并联连接的第二电阻器和第二开关。 第一和第二组合通过第三开关连接。

公开(公告)号：US20070096841A1

公开(公告)日：2007-05-03

申请号：US11261978

申请日：2005-10-28

申请人： Lawrence Connell ,  Daniel McCarthy ,  Michael Bushman

发明人： Lawrence Connell ,  Daniel McCarthy ,  Michael Bushman

IPC分类号： H03L5/00

CPC分类号： H03L3/00 ,  H03B5/06 ,  H03L5/00

摘要： A frequency source having a fast start-up time and low noise in steady state is presented. The frequency source includes an oscillator and a hybrid automatic gain control (AGC) loop that switches between an analog AGC loop at oscillator start up and a digital AGC loop at steady state operation. The analog AGC loop includes a peak detector connected to the oscillator and an error integrator integrating the difference between the peak detector output and a reference voltage. The digital AGC loop includes a comparator comparing the peak detector output and high/low reference voltages, an oscillator counter providing a timer signal, a digital-to-analog converter (DAC) supplied with a digital word, and a low pass filter between the DAC and the oscillator. The timer signal causes a multiplexer to select either the analog AGC loop or the digital AGC loop.

摘要翻译： 提出了一种在稳态下具有快速起动时间和低噪声的频率源。 频率源包括振荡器和混合自动增益控制（AGC）环路，其在振荡器启动时在模拟AGC环路和稳态操作之间的数字AGC环路之间切换。 模拟AGC环路包括连接到振荡器的峰值检测器和积分峰值检测器输出和参考电压之间的差的误差积分器。 数字AGC环路包括比较峰值检测器输出和高/低参考电压的比较器，提供定时器信号的振荡器计数器，提供有数字字的数模转换器（DAC）和在数字字之间的低通滤波器 DAC和振荡器。 定时器信号使多路复用器选择模拟AGC环路或数字AGC环路。