公开(公告)号：US08412143B2

公开(公告)日：2013-04-02

申请号：US12580998

申请日：2009-10-16

Applicant: Cheng-Han Wang

Inventor： Cheng-Han Wang

IPC: H04B1/16

CPC classification number: H03D7/1441 ,  H03D7/1458 ,  H03D7/1466 ,  H03D2200/0084

Abstract: An improved passive double balanced mixer with reduced capacitor voltage mismatch is described. A passive double balanced mixer includes two sets of mixer circuits, each comprised of switches. Each switch is separately divided into a first portion and a second portion of unequal number of fingers. A first and second LO AC coupling capacitors associated with a given switch are coupled at one end to an LO signal. The outputs of the first LO AC coupling capacitors are coupled to the first portion of the first switch and the second portion of the second switch, respectively, while the outputs of the second LO AC coupling capacitors are coupled to the second portion of the first switch and the first portion of the second switch, respectively. In one embodiment, the unequal number of fingers is defined by an n−1 and an n+1 number of fingers, respectively. In an alternate embodiment, the mixer is an ADB mixer with a transconductance amplifier and two sets of mixer circuits as above.

Abstract translation: 描述了具有降低的电容器电压失配的改进的无源双平衡混频器。 无源双平衡混频器包括两组混频器电路，每组由开关组成。 每个开关被分成不同数目的手指的第一部分和第二部分。 与给定开关相关联的第一和第二LO AC耦合电容器在一端耦合到LO信号。 第一LO交流耦合电容器的输出分别耦合到第一开关的第一部分和第二开关的第二部分，而第二LO AC耦合电容器的输出耦合到第一开关的第二部分 和第二开关的第一部分。 在一个实施例中，不同数量的手指分别由n-1和n + 1个手指定义。 在替代实施例中，混频器是具有跨导放大器和如上所述的两组混频器电路的ADB混频器。

公开(公告)号：US20120326792A1

公开(公告)日：2012-12-27

申请号：US13167655

申请日：2011-06-23

Applicant: Cheng-Han Wang ,  Liang Zhao ,  Hong Sun Kim ,  I-Hsiang Lin

Inventor： Cheng-Han Wang ,  Liang Zhao ,  Hong Sun Kim ,  I-Hsiang Lin

IPC: H03F1/26 ,  H03F1/22

CPC classification number: H03F3/193 ,  H03F1/3211 ,  H03F3/45188 ,  H03F2203/45386 ,  H04B1/1036

Abstract: Systematic IM2 calibration for a differential LNA is disclosed. In an aspect, an apparatus includes an amplifier configured to output an amplified signal having a level of systematic pre-mixer IM2 distortion, a detector configured to detect the level of the systematic pre-mixer IM2 distortion in the amplified signal, and a bias signal generator configured to generate at least one bias signal configured to adjust the amplifier to reduce the level of the systematic pre-mixer IM2 distortion.

Abstract translation: 公开了用于差分LNA的系统IM2校准。 一方面，一种装置包括：放大器，被配置为输出具有系统预混频器IM2失真电平的放大信号;检测器，被配置为检测放大信号中的系统预混频器IM2失真的电平;以及偏置信号 配置成产生至少一个偏置信号的发生器，所述至少一个偏置信号被配置为调节放大器以减小系统预混频器IM2失真的电平。

公开(公告)号：US20130281042A1

公开(公告)日：2013-10-24

申请号：US13450120

申请日：2012-04-18

Applicant: Cheng-Han Wang ,  Liang Zhao ,  Hong Sun Kim ,  Jin-Su Ko

Inventor： Cheng-Han Wang ,  Liang Zhao ,  Hong Sun Kim ,  Jin-Su Ko

IPC: H04B1/10

CPC classification number: H03F3/45188 ,  H03F1/565 ,  H03F3/193 ,  H03F2200/294 ,  H03F2200/546 ,  H03F2203/45386 ,  H03F2203/45641 ,  H03F2203/45726 ,  H04B1/109 ,  H04B1/3805

Abstract: A reconfigurable LNA for increased jammer rejection is disclosed. An exemplary embodiment includes an LNA having a tunable resonant frequency, and a detector configured to output a control signal to tune the resonant frequency of the LNA to increase jammer suppression. An exemplary method includes detecting if a jammer is present, tuning a resonant frequency of an LNA away from the jammer to increase jammer rejection if the jammer is present, and tuning the resonant frequency of the LNA to a selected operating frequency if the jammer is not present.

Abstract translation: 公开了一种用于增加干扰抑制的可重构LNA。 示例性实施例包括具有可调谐谐振频率的LNA，以及被配置为输出控制信号以调谐LNA的谐振频率以增加干扰抑制的检测器。 一种示例性方法包括检测干扰信号是否存在，如果干扰信号存在，则调谐LNA的谐振频率远离干扰信号以增加干扰抑制，并且如果干扰信号不是，则将LNA的谐振频率调谐到所选择的操作频率 当下。

公开(公告)号：US07994870B2

公开(公告)日：2011-08-09

申请号：US12254155

申请日：2008-10-20

Applicant: Cheng-Han Wang ,  Tzu-wang Pan

Inventor： Cheng-Han Wang ,  Tzu-wang Pan

IPC: H03L7/00

CPC classification number: H03H11/1291 ,  H03H11/1256

Abstract: An apparatus includes a filter and a gain control circuit. The filter receives and filters an input signal and provides an output signal in a first mode and operates as part of an oscillator in a second mode. The gain control circuit varies the amplitude of an oscillator signal from the oscillator in the second mode, e.g., by adjusting at least one variable gain element within the oscillator to obtain a target amplitude and/or non rail-to-rail signal swing for the oscillator signal. The apparatus may further include a bandwidth control circuit to adjust the bandwidth of the filter in the second mode. The bandwidth control circuit receives the oscillator signal, determines a target oscillation frequency corresponding to a selected bandwidth for the filter, and adjusts at least one circuit element within the filter to obtain the target oscillation frequency.

Abstract translation: 一种装置包括滤波器和增益控制电路。 滤波器接收并过滤输入信号并在第一模式中提供输出信号，并且在第二模式中作为振荡器的一部分进行操作。 增益控制电路在第二模式中改变来自振荡器的振荡器信号的振幅，例如，通过调整振荡器内的至少一个可变增益元件以获得目标振幅和/或非轨至轨信号摆动 振荡器信号。 该装置还可以包括带宽控制电路，以在第二模式中调整滤波器的带宽。 带宽控制电路接收振荡器信号，确定与滤波器的选定带宽对应的目标振荡频率，并调整滤波器内的至少一个电路元件以获得目标振荡频率。

公开(公告)号：US20100097152A1

公开(公告)日：2010-04-22

申请号：US12254155

申请日：2008-10-20

Applicant: Cheng-Han Wang ,  Tzu-wang Pan

Inventor： Cheng-Han Wang ,  Tzu-wang Pan

IPC: G01R23/00 ,  H03L5/00

CPC classification number: H03H11/1291 ,  H03H11/1256

Abstract: An apparatus includes a filter and a gain control circuit. The filter receives and filters an input signal and provides an output signal in a first mode and operates as part of an oscillator in a second mode. The gain control circuit varies the amplitude of an oscillator signal from the oscillator in the second mode, e.g., by adjusting at least one variable gain element within the oscillator to obtain a target amplitude and/or non rail-to-rail signal swing for the oscillator signal. The apparatus may further include a bandwidth control circuit to adjust the bandwidth of the filter in the second mode. The bandwidth control circuit receives the oscillator signal, determines a target oscillation frequency corresponding to a selected bandwidth for the filter, and adjusts at least one circuit element within the filter to obtain the target oscillation frequency.

Abstract translation: 一种装置包括滤波器和增益控制电路。 滤波器接收并过滤输入信号并在第一模式中提供输出信号，并且在第二模式中作为振荡器的一部分进行操作。 增益控制电路在第二模式中改变来自振荡器的振荡器信号的振幅，例如，通过调整振荡器内的至少一个可变增益元件以获得目标振幅和/或非轨至轨信号摆幅 振荡器信号。 该装置还可以包括带宽控制电路，以在第二模式中调整滤波器的带宽。 带宽控制电路接收振荡器信号，确定与滤波器的选定带宽对应的目标振荡频率，并调整滤波器内的至少一个电路元件以获得目标振荡频率。

公开(公告)号：US08653892B2

公开(公告)日：2014-02-18

申请号：US13167655

申请日：2011-06-23

Applicant: Cheng-Han Wang ,  Liang Zhao ,  Hong Sun Kim ,  I-Hsiang Lin

Inventor： Cheng-Han Wang ,  Liang Zhao ,  Hong Sun Kim ,  I-Hsiang Lin

IPC: H03F1/26

CPC classification number: H03F3/193 ,  H03F1/3211 ,  H03F3/45188 ,  H03F2203/45386 ,  H04B1/1036

Abstract: Systematic IM2 calibration for a differential LNA is disclosed. In an aspect, an apparatus includes an amplifier configured to output an amplified signal having a level of systematic pre-mixer IM2 distortion, a detector configured to detect the level of the systematic pre-mixer IM2 distortion in the amplified signal, and a bias signal generator configured to generate at least one bias signal configured to adjust the amplifier to reduce the level of the systematic pre-mixer IM2 distortion.

Abstract translation: 公开了用于差分LNA的系统IM2校准。 一方面，一种装置包括：放大器，被配置为输出具有系统预混频器IM2失真电平的放大信号;检测器，被配置为检测放大信号中的系统预混频器IM2失真的电平;以及偏置信号 配置成产生至少一个偏置信号的发生器，所述至少一个偏置信号被配置为调节放大器以减小系统预混频器IM2失真的电平。

公开(公告)号：US08428533B2

公开(公告)日：2013-04-23

申请号：US12796598

申请日：2010-06-08

Applicant: Cheng-Han Wang

Inventor： Cheng-Han Wang

IPC: H04B1/06

CPC classification number: H04B1/18

Abstract: Techniques for optimizing gain or noise figure of an RF receiver are disclosed. In an exemplary embodiment a controller controls a capacitor bank between an LNA and a mixer of the RF front end of the receiver. For a given center frequency a first set of capacitors is switched to the mixer and a second set of capacitors is switched to ground. The ratio of capacitance of the second set to the first set of capacitors affects either gain of the RF FE or noise figure of the receiver. Therefore, the RF FE of the receiver may be controlled in such a way as to optimize for either RF FE gain or for receiver noise figure.

Abstract translation: 公开了用于优化RF接收机的增益或噪声系数的技术。 在示例性实施例中，控制器控制LNA与接收器的RF前端的混频器之间的电容器组。 对于给定的中心频率，第一组电容器被切换到混频器，并且第二组电容器被切换到接地。 第二组电容与第一组电容器的电容比例影响接收机的RF FE增益或噪声系数。 因此，可以以对于RF FE增益或接收机噪声系数进行优化的方式来控制接收机的RF FE。

公开(公告)号：US20110092178A1

公开(公告)日：2011-04-21

申请号：US12580998

申请日：2009-10-16

Applicant: Cheng-Han Wang

Inventor： Cheng-Han Wang

IPC: H04B1/26

CPC classification number: H03D7/1441 ,  H03D7/1458 ,  H03D7/1466 ,  H03D2200/0084

Abstract: An improved passive double balanced mixer with reduced capacitor voltage mismatch is described. A passive double balanced mixer includes two sets of mixer circuits, each comprised of switches. Each switch is separately divided into a first portion and a second portion of unequal number of fingers. A first and second LO AC coupling capacitors associated with a given switch are coupled at one end to an LO signal. The outputs of the first LO AC coupling capacitors are coupled to the first portion of the first switch and the second portion of the second switch, respectively, while the outputs of the second LO AC coupling capacitors are coupled to the second portion of the first switch and the first portion of the second switch, respectively. In one embodiment, the unequal number of fingers is defined by an n−1 and an n+1 number of fingers, respectively. In an alternate embodiment, the mixer is an ADB mixer with a transconductance amplifier and two sets of mixer circuits as above.

Abstract translation: 描述了具有降低的电容器电压失配的改进的无源双平衡混频器。 无源双平衡混频器包括两组混频器电路，每组由开关组成。 每个开关被分成不同数目的手指的第一部分和第二部分。 与给定开关相关联的第一和第二LO AC耦合电容器在一端耦合到LO信号。 第一LO交流耦合电容器的输出分别耦合到第一开关的第一部分和第二开关的第二部分，而第二LO AC耦合电容器的输出耦合到第一开关的第二部分 和第二开关的第一部分。 在一个实施例中，不同数量的手指分别由n-1和n + 1个手指定义。 在替代实施例中，混频器是具有跨导放大器和如上所述的两组混频器电路的ADB混频器。

公开(公告)号：US20100156532A1

公开(公告)日：2010-06-24

申请号：US12340142

申请日：2008-12-19

Applicant: Cheng-Han Wang ,  Tzu-wang Pan ,  Roger Brockenbrough

Inventor： Cheng-Han Wang ,  Tzu-wang Pan ,  Roger Brockenbrough

IPC: H03F3/45

CPC classification number: H03F3/45183 ,  H03F1/307

Abstract: A class AB amplifier with resistive level-shifting circuitry is described. In one exemplary design, the class AB amplifier includes an input stage, a resistive level-shifting stage, a class AB output stage, and a bias circuit. The input stage receives an input signal and provides a first drive signal. The resistive level-shifting stage receives the first drive signal and provides a second drive signal. The output stage receives the first and second drive signals and provides an output signal. The bias circuit generates a bias voltage for the resistive level-shifting stage to obtain a desired quiescent current for the output stage. In one exemplary design, the resistive level-shifting stage includes a transistor and a resistor. The transistor receives the bias voltage and provides the second drive signal. The resistor is coupled to the transistor and provides a voltage drop between the first and second drive signals.

Abstract translation: 描述了具有阻性电平移位电路的AB类放大器。 在一个示例性设计中，AB类放大器包括输入级，电阻电平转换级，AB类输出级和偏置电路。 输入级接收输入信号并提供第一驱动信号。 电阻电平转换级接收第一驱动信号并提供第二驱动信号。 输出级接收第一和第二驱动信号并提供输出信号。 偏置电路产生用于电阻电平移位级的偏置电压，以获得用于输出级的期望的静态电流。 在一个示例性设计中，电阻电平移位级包括晶体管和电阻器。 晶体管接收偏置电压并提供第二驱动信号。 电阻器耦合到晶体管并且在第一和第二驱动信号之间提供电压降。

公开(公告)号：US08718587B2

公开(公告)日：2014-05-06

申请号：US13450120

申请日：2012-04-18

Applicant: Cheng-Han Wang ,  Liang Zhao ,  Hong Sun Kim ,  Jin-Su Ko

Inventor： Cheng-Han Wang ,  Liang Zhao ,  Hong Sun Kim ,  Jin-Su Ko

IPC: H04B1/06

CPC classification number: H03F3/45188 ,  H03F1/565 ,  H03F3/193 ,  H03F2200/294 ,  H03F2200/546 ,  H03F2203/45386 ,  H03F2203/45641 ,  H03F2203/45726 ,  H04B1/109 ,  H04B1/3805

Abstract: A reconfigurable LNA for increased jammer rejection is disclosed. An exemplary embodiment includes an LNA having a tunable resonant frequency, and a detector configured to output a control signal to tune the resonant frequency of the LNA to increase jammer suppression. An exemplary method includes detecting if a jammer is present, tuning a resonant frequency of an LNA away from the jammer to increase jammer rejection if the jammer is present, and tuning the resonant frequency of the LNA to a selected operating frequency if the jammer is not present.

Abstract translation: 公开了一种用于增加干扰抑制的可重构LNA。 示例性实施例包括具有可调谐谐振频率的LNA，以及被配置为输出控制信号以调谐LNA的谐振频率以增加干扰抑制的检测器。 一种示例性方法包括检测干扰信号是否存在，如果干扰信号存在，则调谐LNA的谐振频率远离干扰信号以增加干扰抑制，并且如果干扰信号不是，则将LNA的谐振频率调谐到所选择的操作频率 当下。