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1. 发明授权

US07295068B2 Increasing the linearity of a transconductance cell 有权
标题翻译：增加跨导电池的线性度
公开(公告)号：US07295068B2
公开(公告)日：2007-11-13
申请号：US11134684
申请日：2005-05-19
申请人： Peter Capofreddi , Arvin Ramesh Shahani , Derek Shaeffer , Korhan Titizer
发明人： Peter Capofreddi , Arvin Ramesh Shahani , Derek Shaeffer , Korhan Titizer
IPC分类号： H03F3/45
CPC分类号： H03F3/45183 , H03F3/45672
摘要： A transconductance cell is disclosed that includes a first transistor and a second transistor. A regulator regulates an average voltage in response to a reference voltage, where the average voltage corresponds to the average of a voltage at a bias terminal of the first transistor and a voltage at a bias terminal of the second transistor. A mixer including the transconductance cell is also disclosed. In the mixer, the transconductance cell receives a differential input voltage and produces a differential output current. The mixer also includes one or more switches that multiply the differential output current with an oscillator signal. A method is disclosed that includes measuring an average voltage of a voltage at a bias terminal of a first transistor and a voltage at a bias terminal of a second transistor and regulating the average voltage responsive to the measured average voltage and a reference voltage.
摘要翻译：公开了一种跨导单元，其包括第一晶体管和第二晶体管。调节器响应于参考电压来调节平均电压，其中平均电压对应于第一晶体管的偏置端子处的电压的平均值和第二晶体管的偏置端子处的电压。还公开了包括跨导电池的混合器。在混频器中，跨导单元接收差分输入电压并产生差分输出电流。混频器还包括一个或多个将差分输出电流与振荡器信号相乘的开关。公开了一种方法，其包括测量第一晶体管的偏置端子处的电压的平均电压和第二晶体管的偏置端子处的电压，并响应于测量的平均电压和参考电压来调节平均电压。

2. 发明申请

US20060261894A1 Increasing the linearity of a transconductance cell 有权
标题翻译：增加跨导电池的线性度
公开(公告)号：US20060261894A1
公开(公告)日：2006-11-23
申请号：US11134684
申请日：2005-05-19
申请人： Peter Capofreddi , Arvin Shahani , Derek Shaeffer , Korhan Titizer
发明人： Peter Capofreddi , Arvin Shahani , Derek Shaeffer , Korhan Titizer
IPC分类号： H03F3/45
CPC分类号： H03F3/45183 , H03F3/45672
摘要： A transconductance cell is disclosed that includes a first transistor and a second transistor. A regulator regulates an average voltage in response to a reference voltage, where the average voltage corresponds to the average of a voltage at a bias terminal of the first transistor and a voltage at a bias terminal of the second transistor. A mixer including the transconductance cell is also disclosed. In the mixer, the transconductance cell receives a differential input voltage and produces a differential output current. The mixer also includes one or more switches that multiply the differential output current with an oscillator signal. A method is disclosed that includes measuring an average voltage of a voltage at a bias terminal of a first transistor and a voltage at a bias terminal of a second transistor and regulating the average voltage responsive to the measured average voltage and a reference voltage.
摘要翻译：公开了一种跨导单元，其包括第一晶体管和第二晶体管。调节器响应于参考电压来调节平均电压，其中平均电压对应于第一晶体管的偏置端子处的电压的平均值和第二晶体管的偏置端子处的电压。还公开了包括跨导电池的混合器。在混频器中，跨导单元接收差分输入电压并产生差分输出电流。混频器还包括一个或多个将差分输出电流与振荡器信号相乘的开关。公开了一种方法，其包括测量第一晶体管的偏置端子处的电压的平均电压和第二晶体管的偏置端子处的电压，并响应于测量的平均电压和参考电压来调节平均电压。

3. 发明申请

US20060103462A1 Method and apparatus for opening a feedback loop 有权
标题翻译：打开反馈回路的方法和装置
公开(公告)号：US20060103462A1
公开(公告)日：2006-05-18
申请号：US10988432
申请日：2004-11-12
申请人： Peter Capofreddi , Derek Shaeffer , Sriraman Dakshinamurthy , Korhan Titizer
发明人： Peter Capofreddi , Derek Shaeffer , Sriraman Dakshinamurthy , Korhan Titizer
IPC分类号： H03F1/36
CPC分类号： H03G3/3042 , H03F1/0205 , H03F1/3247 , H03F1/3252 , H03F1/34 , H03F3/24 , H03F2200/105 , H03F2200/465
摘要： Circuits, methods, and systems are provided for opening a primary feedback loop in a transmitter. An auxiliary feedback loop can be closed when the primary feedback loop is opened, and a controller can match a gain of the primary feedback loop to another gain in the transmitter.
摘要翻译：提供电路，方法和系统用于打开发射机中的主反馈环路。当主反馈回路打开时，辅助反馈回路可以闭合，并且控制器可以将主反馈回路的增益与变送器中的另一增益相匹配。

4. 发明申请

US20060226901A1 LOW PHASE SHIFT IMPLEMENTATION OF THE BASEBAND CIRCUITRY OF A CARTESIAN FEEDBACK LOOP 有权
标题翻译：卡特彼勒反馈循环的基带电路的低相位移位实现
公开(公告)号：US20060226901A1
公开(公告)日：2006-10-12
申请号：US11088676
申请日：2005-03-23
申请人： Peter Capofreddi , Derek Shaeffer , Korhan Titizer
发明人： Peter Capofreddi , Derek Shaeffer , Korhan Titizer
IPC分类号： H03F1/36
CPC分类号： H03F3/45183 , H03F1/0205 , H03F1/3211 , H03F1/3247 , H03F1/3294 , H03F3/3022 , H03F2203/45366 , H03F2203/45644 , H03F2203/45652
摘要： A circuit is provided that includes a Cartesian feedback loop. The Cartesian feedback loop includes one or more operational amplifiers. At least one of the operational amplifiers includes two or more cascaded amplifier stages and one or more bypass amplifier stages. The bypass amplifier stages are connected in parallel with the cascaded amplifier stages.
摘要翻译：提供了包括笛卡尔反馈回路的电路。笛卡尔反馈回路包括一个或多个运算放大器。至少一个运算放大器包括两个或多个级联放大器级和一个或多个旁路放大器级。旁路放大器级与级联放大器级并联连接。

5. 发明授权

US07132885B2 Low phase shift implementation of the baseband circuitry of a Cartesian feedback loop 有权
标题翻译：笛卡尔反馈回路基带电路的低相移实现
公开(公告)号：US07132885B2
公开(公告)日：2006-11-07
申请号：US11088676
申请日：2005-03-23
申请人： Peter Capofreddi , Derek K. Shaeffer , Korhan Titizer
发明人： Peter Capofreddi , Derek K. Shaeffer , Korhan Titizer
IPC分类号： H03F1/36
CPC分类号： H03F3/45183 , H03F1/0205 , H03F1/3211 , H03F1/3247 , H03F1/3294 , H03F3/3022 , H03F2203/45366 , H03F2203/45644 , H03F2203/45652
摘要： A circuit is provided that includes a Cartesian feedback loop. The Cartesian feedback loop includes one or more operational amplifiers. At least one of the operational amplifiers includes two or more cascaded amplifier stages and one or more bypass amplifier stages. The bypass amplifier stages are connected in parallel with the cascaded amplifier stages.
摘要翻译：提供了包括笛卡尔反馈回路的电路。笛卡尔反馈回路包括一个或多个运算放大器。至少一个运算放大器包括两个或多个级联放大器级和一个或多个旁路放大器级。旁路放大器级与级联放大器级并联连接。

6. 发明授权

US07164313B2 Method and apparatus for opening a feedback loop 有权
标题翻译：打开反馈回路的方法和装置
公开(公告)号：US07164313B2
公开(公告)日：2007-01-16
申请号：US10988432
申请日：2004-11-12
申请人： Peter Capofreddi , Derek K. Shaeffer , Sriraman Dakshinamurthy , Korhan Titizer
发明人： Peter Capofreddi , Derek K. Shaeffer , Sriraman Dakshinamurthy , Korhan Titizer
IPC分类号： H03F1/36
CPC分类号： H03G3/3042 , H03F1/0205 , H03F1/3247 , H03F1/3252 , H03F1/34 , H03F3/24 , H03F2200/105 , H03F2200/465
摘要： Circuits, methods, and systems are provided for opening a primary feedback loop in a transmitter. An auxiliary feedback loop can be closed when the primary feedback loop is opened, and a controller can match a gain of the primary feedback loop to another gain in the transmitter.
摘要翻译：提供电路，方法和系统用于打开发射机中的主反馈环路。当主反馈回路打开时，辅助反馈回路可以闭合，并且控制器可以将主反馈回路的增益与变送器中的另一增益相匹配。

7. 发明授权

US6057793A Digital decimation filter and method for achieving fractional data rate reduction with minimal hardware or software overhead 失效
$Digital decimation filter and method for achieving fractional data rate reduction with minimal hardware or software overhead$
公开(公告)号：US6057793A
公开(公告)日：2000-05-02
申请号：US97141
申请日：1998-06-12
申请人： Xue-Mei Gong , Tim J. Dupuis , Jinghui Lu , Korhan Titizer
发明人： Xue-Mei Gong , Tim J. Dupuis , Jinghui Lu , Korhan Titizer
IPC分类号： H03H17/04 , H03M3/00
CPC分类号： H03H17/0671
摘要： An analog-to-digital converter is provided for producing digital signal representative of analog signals. Noise induced upon the digital signals can be substantially removed using a digital decimation filter. The decimation filter includes a front-end portion which receives the digital data at a relatively high sample rate and performs filtering operations with minimal complexity. Preferably, the front-end portion includes at least one stage of filtering and more preferably at least two filter stages, each of which perform interpolation separate from decimation. According to one embodiment, the first stage of the front-end portion involves decimation and the latter stage or stages of that portion involves a combination of interpolation and decimation. The cumulative effect is to reduce the sample rate of the incoming data stream produced by, for example, a quantizer to a value which can be more easily manipulated by the back-end portion of the digital decimation filter. The front-end portion can therefore reduce the data rate change factor K to a smaller, fixed integer data rate change factor K.sub.1, regardless of whether data rate change factor K is an integer number or involves a fractional number.

8. 发明授权

US07433420B1 Phase rotation estimation 有权
标题翻译：相位旋转估计
公开(公告)号：US07433420B1
公开(公告)日：2008-10-07
申请号：US11061153
申请日：2005-02-18
申请人： Sriraman Dakshinamurthy , Joel L. Dawson , Derek K. Shaeffer , Korhan Titizer
发明人： Sriraman Dakshinamurthy , Joel L. Dawson , Derek K. Shaeffer , Korhan Titizer
IPC分类号： H04L25/49
CPC分类号： H04L27/368
摘要： Apparatus, systems, and methods are described that implement techniques for estimating a relative rotation between a first complex signal and a second complex signal. In apparatus form, a rotation-estimation circuit includes a first quadrant detector and receives the first and second complex signals and produces an estimate of the relative rotation between the complex signals. A variable rotator receives the estimate of the relative rotation and rotates at least one of the first and second complex signals using the estimate of the relative rotation. In method form, a first quadrant estimate is calculated that corresponds to the relative rotation between the first and second complex signals, and at least one of the first and second complex signals is rotated using the quadrant estimate of the relative rotation.
摘要翻译：描述了实现用于估计第一复信号和第二复信号之间的相对旋转的技术的装置，系统和方法。在装置形式中，旋转估计电路包括第一象限检测器，并接收第一和第二复数信号，并产生复信号之间的相对旋转的估计。可变旋转器接收相对旋转的估计，并使用相对旋转的估计来旋转第一和第二复数信号中的至少一个。在方法形式中，计算对应于第一和第二复数信号之间的相对旋转的第一象限估计，并且使用相对旋转的象限估计来旋转第一和第二复数信号中的至少一个。

9. 发明授权

US07295074B2 Doherty power amplifier with phase compensation 失效
标题翻译：多相功率放大器，具有相位补偿
公开(公告)号：US07295074B2
公开(公告)日：2007-11-13
申请号：US11097118
申请日：2005-03-31
申请人： Gerald K. Wong , Tushar Ramanlal Shah , Korhan Titizer
发明人： Gerald K. Wong , Tushar Ramanlal Shah , Korhan Titizer
IPC分类号： H03F3/68
CPC分类号： H03F3/604 , H03F1/0288 , H03F2200/198
摘要： A Doherty power amplifier is provided that includes a main amplifier device and an auxiliary amplifier device. The Doherty power amplifier further includes a phase compensation network. The phase compensation network is configured to maintain a substantially constant phase of one of an output signal from the main amplifier device or an output signal from the auxiliary amplifier device across a range of input powers. The Doherty power amplifier further includes an impedance inverter for power combining an output signal of the main amplifier device with an output signal of the auxiliary amplifier device.
摘要翻译：提供了一种Doherty功率放大器，其包括主放大器装置和辅助放大器装置。 Doherty功率放大器还包括相位补偿网络。相位补偿网络被配置为保持来自主放大器装置的输出信号中的一个的相位恒定的相位或来自辅助放大器装置的输出信号的输入功率的范围。 Doherty功率放大器还包括一个阻抗反相器，用于将主放大器装置的输出信号与辅助放大器装置的输出信号进行功率合成。

10. 发明授权

US07295065B2 High efficiency doherty amplifier with a segmented main amplifier 失效
标题翻译：具有分段主放大器的高效率多功率放大器
公开(公告)号：US07295065B2
公开(公告)日：2007-11-13
申请号：US10993408
申请日：2004-11-18
申请人： Tushar Ramanlal Shah , Gerald K. Wong , Korhan Titizer
发明人： Tushar Ramanlal Shah , Gerald K. Wong , Korhan Titizer
IPC分类号： H03F3/68
CPC分类号： H03F1/0288 , H03F2200/198
摘要： A Doherty amplifier that includes a main amplifier device and an auxiliary amplifier device. The main amplifier device includes a plurality of independently controllable amplifier segments. The system further includes a coupler for coupling an input signal to each of the main amplifier device and the auxiliary amplifier device. The system further includes an impedance inverter for power combining an output signal of the main amplifier device with an output signal of the auxiliary amplifier device.
摘要翻译： Doherty放大器，包括主放大器和辅助放大器。主放大器装置包括多个可独立控制的放大器段。该系统还包括用于将输入信号耦合到每个主放大器装置和辅助放大器装置的耦合器。该系统还包括用于将主放大器装置的输出信号与辅助放大器装置的输出信号进行功率合成的阻抗反相器。

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