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1.发明申请SYSTEM AND METHOD FOR TUNING A SEMI-DIGITAL FINITE IMPULSE RESPONSE (sFIR) FILTER 审中-公开用于调整半数字有限冲突响应（sFIR）滤波器的系统和方法公开(公告)号：US20130033335A1
公开(公告)日：2013-02-07
申请号：US13195486
申请日：2011-08-01
CPC分类号： H03H17/0294 , H03H17/0283 , H03H17/06 , H03H2017/0295
摘要： In accordance with some embodiments of the present disclosure, a method for tuning a semi-digital finite impulse response (sFIR) filter comprises coupling a switch between an output of a shift register element associated with an input of the sFIR filter and a resistor coupled to an output of the sFIR filter. The shift register element and the resistor are associated with a tap of the sFIR filter. The method further comprising at least one of closing the switch according to a control signal to couple the resistor with the output of the shift register element such that a tap is added to the sFIR filter and opening the switch according to the control signal to decouple the resistor from the output of the shift register element such that a tap is subtracted from the sFIR filter to tune the corner frequency of the sFIR filter.
摘要翻译： 根据本公开的一些实施例，用于调整半数字有限脉冲响应（sFIR）滤波器的方法包括将与sFIR滤波器的输入相关联的移位寄存器元件的输出与耦合到 sFIR滤波器的输出。 移位寄存器元件和电阻与sFIR滤波器的抽头相关联。 该方法还包括根据控制信号关闭开关的至少一个，以将电阻器与移位寄存器元件的输出耦合，使得抽头被添加到sFIR滤波器并且根据控制信号打开开关以去耦 电阻器，从移位寄存器元件的输出，使得从sFIR滤波器中减去抽头以调整sFIR滤波器的转角频率。
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公开(公告)号：US20100022215A1
公开(公告)日：2010-01-28
申请号：US12180936
申请日：2008-07-28
IPC分类号： H04B1/16
CPC分类号： H03H11/126 , H04B1/0475
摘要： An embodiment of a baseband filter in a transmitter subsystem of a wireless device comprises an operational amplifier (op-amp), a pole circuit, a feedback capacitor, and an active device. The op-amp is adapted to produce an amplified signal that includes noise gain produced by the op-amp. The pole circuit is electrically coupled with an output terminal of the op-amp, and is adapted to receive the amplified signal and to attenuate the noise gain to produce a filtered, amplified signal. The feedback capacitor is electrically coupled between the first pole circuit and an input terminal of the op-amp, and is adapted to compensate for a phase shift produced by the pole circuit. The active device is electrically coupled with the pole circuit, and is adapted to amplify the filtered, amplified signal and to produce a baseband filtered output signal.
摘要翻译： 无线设备的发射机子系统中的基带滤波器的实施例包括运算放大器（op-amp），极点电路，反馈电容器和有源器件。 该运算放大器适于产生包括由运算放大器产生的噪声增益的放大信号。 极电路与运算放大器的输出端子电耦合，并且适于接收放大的信号并衰减噪声增益以产生经滤波的放大信号。 反馈电容器电耦合在第一极电路和运算放大器的输入端之间，并且适于补偿由极电路产生的相移。 有源器件与极电路电耦合，并且适于放大经滤波的放大信号并产生基带滤波的输出信号。
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3.发明申请公开(公告)号：US20130040695A1
公开(公告)日：2013-02-14
申请号：US13207672
申请日：2011-08-11
申请人： Chuanzhao Yu , Omid Oliaei , David Newman , Michael L. Gomez
发明人： Chuanzhao Yu , Omid Oliaei , David Newman , Michael L. Gomez
IPC分类号： H04W88/02
CPC分类号： H03F3/193
摘要： In accordance with some embodiments of the present disclosure, a circuit comprises an input node configured to receive a current-mode input signal and an input stage that includes an input device communicatively coupled to the input node. The input device is configured to receive the input signal at the input node. The circuit additionally comprises bias circuitry communicatively coupled to the input stage and configured to provide a bias current for the input device. The bias circuitry is also configured to remove at least a portion of the bias current from the input signal through a feedback loop associated with the input node such that the input signal is received by the input device with at least a portion of the bias current removed. The circuit further comprises an output stage communicatively coupled to the input stage and configured to output a current-mode output signal based on the input signal.
摘要翻译： 根据本公开的一些实施例，电路包括被配置为接收电流模式输入信号的输入节点和包括通信地耦合到输入节点的输入设备的输入级。 输入设备被配置为在输入节点处接收输入信号。 电路还包括通信地耦合到输入级并被配置为为输入设备提供偏置电流的偏置电路。 偏置电路还被配置为通过与输入节点相关联的反馈回路从输入信号中去除偏置电流的至少一部分，使得输入信号由输入装置接收，其中偏置电流的至少一部分被去除 。 电路还包括通信地耦合到输入级并被配置为基于输入信号输出电流模式输出信号的输出级。
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公开(公告)号：US20080165040A1
公开(公告)日：2008-07-10
申请号：US11651858
申请日：2007-01-10
申请人： Christian J. Rotchford , Brandt Braswell , Jiangbo Gan , Michael L. Gomez , Gerald P. Miaille , Boris V. Razmyslovitch
发明人： Christian J. Rotchford , Brandt Braswell , Jiangbo Gan , Michael L. Gomez , Gerald P. Miaille , Boris V. Razmyslovitch
IPC分类号： H03M1/10
CPC分类号： H03M1/1047 , H03M1/66
摘要： Methods and corresponding systems for calibrating a digital-to-analog converter include selecting first and second code regions in the digital-to-analog converter, wherein the first and second code regions are separated by a boundary. Thereafter a waveform sequence is input into the digital-to-analog converter, wherein the waveform sequence has a zero offset at the boundary. Then a relative compensation value between the first and second code regions is adjusted to reduce a distortion in an output of the digital-to-analog converter. A magnitude of a third harmonic distortion of the waveform sequence can be used to measure distortion in the output. Adjusting the relative compensation can include converting the output of the digital-to-analog converter to a digital sequence, filtering the digital sequence, and measuring a harmonic distortion in the digital sequence.
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公开(公告)号：US5649008A
公开(公告)日：1997-07-15
申请号：US284950
申请日：1994-08-02
摘要： A cordless telephone has receive (12) and transmit (14) signal paths for passing voice signals. Sidetones normally appear in the receive signal path from the near party's voice. A signal strength comparator (34) monitors the transmit signal path and the receive signal path and asserts a gain control signal when the transmit path signal strength exceeds a threshold set to a predetermined value below the receive path signal strength. The gain control signal decreases the gain (42) in the receive signal path to reduce undesirably loud sidetones in the speaker earpiece. When the transmit path signal strength is less than the predetermined threshold, the gain control signal is not asserted allowing maximum amplification in the receive signal path as the sidetone is sufficiently small as to not interfere with the main received voice signal, or otherwise become noticeably loud in the speaker earpiece.
摘要翻译： 无绳电话具有用于通过语音信号的接收（12）和发送（14）信号路径。 Sidetones通常出现在接近信号路径中，从近方的声音。 信号强度比较器（34）监测发射信号路径和接收信号路径，并且当发射路径信号强度超过设定在低于接收路径信号强度的预定值的阈值时，发出增益控制信号。 增益控制信号减小接收信号路径中的增益（42），以减少扬声器耳机中不希望有的大的侧音。 当发送路径信号强度小于预定阈值时，增益控制信号不被断言，允许接收信号路径中的最大放大，因为侧音足够小，以致不干扰主接收到的语音信号，或以其他方式变得显着地响亮 在扬声器耳机。
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公开(公告)号：US07957716B2
公开(公告)日：2011-06-07
申请号：US12180936
申请日：2008-07-28
CPC分类号： H03H11/126 , H04B1/0475
摘要： An embodiment of a baseband filter in a transmitter subsystem of a wireless device comprises an operational amplifier (op-amp), a pole circuit, a feedback capacitor, and an active device. The op-amp is adapted to produce an amplified signal that includes noise gain produced by the op-amp. The pole circuit is electrically coupled with an output terminal of the op-amp, and is adapted to receive the amplified signal and to attenuate the noise gain to produce a filtered, amplified signal. The feedback capacitor is electrically coupled between the first pole circuit and an input terminal of the op-amp, and is adapted to compensate for a phase shift produced by the pole circuit. The active device is electrically coupled with the pole circuit, and is adapted to amplify the filtered, amplified signal and to produce a baseband filtered output signal.
摘要翻译： 无线设备的发射机子系统中的基带滤波器的实施例包括运算放大器（op-amp），极点电路，反馈电容器和有源器件。 该运算放大器适于产生包括由运算放大器产生的噪声增益的放大信号。 极电路与运算放大器的输出端子电耦合，并且适于接收放大的信号并衰减噪声增益以产生经滤波的放大信号。 反馈电容器电耦合在第一极电路和运算放大器的输入端之间，并且适于补偿由极电路产生的相移。 有源器件与极电路电耦合，并且适于放大经滤波的放大信号并产生基带滤波的输出信号。
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公开(公告)号：US5424682A
公开(公告)日：1995-06-13
申请号：US283417
申请日：1994-08-01
IPC分类号： H03G3/30
CPC分类号： H03G3/3005
摘要： A variable gain control circuit (10) provides an output signal having a gain dependent on first (34) and second (52) reference current sources. An amplifier circuit (14, 20) generates first and second dynamic control voltages that control current flow through an input stage (30) referenced to the first reference current source. The dynamic control voltages produce similar currents in an output stage (32) referenced to the second reference current source. The dynamic control voltages to the input and output stage allow the variable gain amplifier circuit to operate with low power supply potentials which is especially useful in battery applications.
摘要翻译： 可变增益控制电路（10）提供具有取决于第一（34）和第二（52）参考电流源的增益的输出信号。 放大器电路（14,20）产生控制电流通过参考第一参考电流源的输入级（30）的第一和第二动态控制电压。 动态控制电压在参考第二参考电流源的输出级（32）中产生相似的电流。 到输入和输出级的动态控制电压允许可变增益放大器电路以低电源电位工作，这在电池应用中特别有用。
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8.发明授权公开(公告)号：US08463206B2
公开(公告)日：2013-06-11
申请号：US13207672
申请日：2011-08-11
申请人： Chuanzhao Yu , Omid Oliaei , David Newman , Michael L. Gomez
发明人： Chuanzhao Yu , Omid Oliaei , David Newman , Michael L. Gomez
IPC分类号： H04B1/04
CPC分类号： H03F3/193
摘要： In accordance with some embodiments of the present disclosure, a circuit comprises an input node configured to receive a current-mode input signal and an input stage that includes an input device communicatively coupled to the input node. The input device is configured to receive the input signal at the input node. The circuit additionally comprises bias circuitry communicatively coupled to the input stage and configured to provide a bias current for the input device. The bias circuitry is also configured to remove at least a portion of the bias current from the input signal through a feedback loop associated with the input node such that the input signal is received by the input device with at least a portion of the bias current removed. The circuit further comprises an output stage communicatively coupled to the input stage and configured to output a current-mode output signal based on the input signal.
摘要翻译： 根据本公开的一些实施例，电路包括被配置为接收电流模式输入信号的输入节点和包括通信地耦合到输入节点的输入设备的输入级。 输入设备被配置为在输入节点处接收输入信号。 电路还包括通信地耦合到输入级并被配置为为输入设备提供偏置电流的偏置电路。 偏置电路还被配置为通过与输入节点相关联的反馈回路从输入信号中去除偏置电流的至少一部分，使得输入信号由输入装置接收，其中偏置电流的至少一部分被去除 。 电路还包括通信地耦合到输入级并被配置为基于输入信号输出电流模式输出信号的输出级。
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公开(公告)号：US07443323B2
公开(公告)日：2008-10-28
申请号：US11651858
申请日：2007-01-10
申请人： Christian J. Rotchford , Brandt Braswell , Jiangbo Gan , Michael L. Gomez , Gerald P. Miaille , Boris V. Razmyslovitch
发明人： Christian J. Rotchford , Brandt Braswell , Jiangbo Gan , Michael L. Gomez , Gerald P. Miaille , Boris V. Razmyslovitch
IPC分类号： H03M1/10
CPC分类号： H03M1/1047 , H03M1/66
摘要： Methods and corresponding systems for calibrating a digital-to-analog converter include selecting first and second code regions in the digital-to-analog converter, wherein the first and second code regions are separated by a boundary. Thereafter a waveform sequence is input into the digital-to-analog converter, wherein the waveform sequence has a zero offset at the boundary. Then a relative compensation value between the first and second code regions is adjusted to reduce a distortion in an output of the digital-to-analog converter. A magnitude of a third harmonic distortion of the waveform sequence can be used to measure distortion in the output. Adjusting the relative compensation can include converting the output of the digital-to-analog converter to a digital sequence, filtering the digital sequence, and measuring a harmonic distortion in the digital sequence.
摘要翻译： 用于校准数模转换器的方法和相应的系统包括选择数模转换器中的第一和第二代码区，其中第一和第二代码区被边界分隔开。 此后，将波形序列输入到数模转换器，其中波形序列在边界处具有零偏移。 然后调整第一和第二代码区之间的相对补偿值以减小数模转换器的输出中的失真。 可以使用波形序列的三次谐波失真的大小来测量输出中的失真。 调整相对补偿可以包括将数模转换器的输出转换为数字序列，对数字序列进行滤波，并测量数字序列中的谐波失真。
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