公开(公告)号：US08295798B2

公开(公告)日：2012-10-23

申请号：US12254129

申请日：2008-10-20

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

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

IPC: H04B1/06

CPC classification number: H03H11/1291

Abstract: An apparatus includes first and second filters and a bandwidth control circuit. The first filter operates as part of a first oscillator in a first mode and filters a first input signal and provides a first output signal in a second mode. The second filter operates as part of a second oscillator in the first mode and filters a second input signal and provides a second output signal in the second mode. The bandwidth control circuit adjusts the bandwidth of the first and second filters in the first mode, e.g., adjusts the oscillation frequency of each oscillator to obtain a target bandwidth for an associated filter. The apparatus may further include first and second gain control circuits. Each gain control circuit may vary the amplitude of an oscillator signal from an associated oscillator and/or set a gain of an associated filter in the first mode.

Abstract translation: 一种装置包括第一和第二滤波器以及带宽控制电路。 第一滤波器在第一模式中作为第一振荡器的一部分进行操作，并且对第一输入信号进行滤波并在第二模式中提供第一输出信号。 第二滤波器在第一模式中作为第二振荡器的一部分进行操作，并且对第二输入信号进行滤波并在第二模式中提供第二输出信号。 带宽控制电路在第一模式中调整第一和第二滤波器的带宽，例如调整每个振荡器的振荡频率以获得相关滤波器的目标带宽。 该装置还可以包括第一和第二增益控制电路。 每个增益控制电路可以改变来自相关振荡器的振荡器信号的幅度和/或在第一模式中设置相关联的滤波器的增益。

公开(公告)号：US20110300821A1

公开(公告)日：2011-12-08

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：US20100099372A1

公开(公告)日：2010-04-22

申请号：US12254129

申请日：2008-10-20

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

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

IPC: H04B1/16 ,  H03H7/00

CPC classification number: H03H11/1291

Abstract: An apparatus includes first and second filters and a bandwidth control circuit. The first filter operates as part of a first oscillator in a first mode and filters a first input signal and provides a first output signal in a second mode. The second filter operates as part of a second oscillator in the first mode and filters a second input signal and provides a second output signal in the second mode. The bandwidth control circuit adjusts the bandwidth of the first and second filters in the first mode, e.g., adjusts the oscillation frequency of each oscillator to obtain a target bandwidth for an associated filter. The apparatus may further include first and second gain control circuits. Each gain control circuit may vary the amplitude of an oscillator signal from an associated oscillator and/or set a gain of an associated filter in the first mode.

Abstract translation: 一种装置包括第一和第二滤波器以及带宽控制电路。 第一滤波器在第一模式中作为第一振荡器的一部分进行操作，并且对第一输入信号进行滤波并在第二模式中提供第一输出信号。 第二滤波器在第一模式中作为第二振荡器的一部分进行操作，并且对第二输入信号进行滤波并在第二模式中提供第二输出信号。 带宽控制电路在第一模式中调整第一和第二滤波器的带宽，例如调整每个振荡器的振荡频率以获得相关滤波器的目标带宽。 该装置还可以包括第一和第二增益控制电路。 每个增益控制电路可以改变来自相关振荡器的振荡器信号的幅度和/或在第一模式中设置相关联的滤波器的增益。

公开(公告)号：US08536947B2

公开(公告)日：2013-09-17

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。