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：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。

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：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：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：US08437721B2

公开(公告)日：2013-05-07

申请号：US12430106

申请日：2009-04-26

Applicant: Yi Zeng ,  Tzu-wang Pan ,  I-Hsiang Lin ,  Jeremy Dunworth ,  Pushp Trikha ,  Rahul Apte

Inventor： Yi Zeng ,  Tzu-wang Pan ,  I-Hsiang Lin ,  Jeremy Dunworth ,  Pushp Trikha ,  Rahul Apte

IPC: H04B1/06 ,  H04B7/00

CPC classification number: H04B1/1027

Abstract: A frequency synthesizer within an FM receiver employs a Phase-Locked Loop (PLL) to generate a Local Oscillator (LO) signal. The LO signal is supplied to a mixer. The FM receiver also includes jammer detection functionality. If no jammer is detected, then the loop bandwidth of the PLL is set to have a relatively high value, thereby favoring suppression of in-band residual FM. If a jammer is detected, then the loop bandwidth of the PLL is set to have a relatively low value, thereby favoring suppression of out-of-band SSB phase noise. By adaptively changing loop bandwidth depending on whether a jammer is detected, performance requirements on sub-circuits within the PLL can be relaxed while still satisfying in-band residual FM and out-of-band SSB phase noise requirements. By allowing the VCO of the PLL to generate more phase noise due to the adaptive changing of loop bandwidth, VCO power consumption can be reduced.

Abstract translation: FM接收机内的频率合成器采用锁相环（PLL）来产生本地振荡器（LO）信号。 LO信号提供给混频器。 FM接收机还包括干扰检测功能。 如果没有检测到干扰，则PLL的环路带宽被设置为具有相对较高的值，从而有利于抑制带内剩余FM。 如果检测到干扰，则将PLL的环路带宽设置为具有相对较低的值，从而有利于抑制带外SSB相位噪声。 通过根据是否检测到干扰信号来自适应地改变环路带宽，可以放宽PLL内的子电路的性能要求，同时仍然满足带内剩余FM和带外SSB相位噪声要求。 通过允许PLL的VCO由于环路带宽的自适应变化而产生更多的相位噪声，可以降低VCO的功耗。

公开(公告)号：US08472890B2

公开(公告)日：2013-06-25

申请号：US11947597

申请日：2007-11-29

Applicant: Wei Zhuo ,  Aristotele Hadjichristos ,  Tzu-wang Pan

Inventor： Wei Zhuo ,  Aristotele Hadjichristos ,  Tzu-wang Pan

IPC: H04B1/40

CPC classification number: H04B1/109 ,  H04B1/525

Abstract: A communication device includes a transmitter and a receiver. The receiver mixes a local oscillator (LO) signal with the received signal to downconvert the received signal to an intermediate frequency (IF). The LO path that feeds the LO signal to the downconverting mixer is controlled based on the transmit power of the transmitter. For high transmit power, the drive of the LO path is increased, thereby increasing the signal-to-noise ratio of the LO signal input into the mixer. For low transmit power levels, the drive to the LO path is decreased, reducing power consumption in the communication device. In this way, receiver path noise due to mixing of the LO phase noise with the self-generated transmitter signal is selectively controlled while incurring lower power consumption penalty. The communication device may be an access terminal configured for communication with a cellular radio network.

Abstract translation: 通信设备包括发射机和接收机。 接收器将本地振荡器（LO）信号与接收到的信号混合，以将接收到的信号下变频到中频（IF）。 基于发射机的发射功率来控制将LO信号馈送到下变频混频器的LO路径。 对于高发射功率，LO路径的驱动增加，从而增加输入混频器的LO信号的信噪比。 对于低发射功率电平，降低LO路径的驱动，从而降低通信设备的功耗。 以这种方式，由于LO相位噪声与自发送发射机信号的混合引起的接收机路径噪声被选择性地控制，同时产生较低的功耗损失。 通信设备可以是被配置为与蜂窝无线电网络进行通信的接入终端。

公开(公告)号：US20100330941A1

公开(公告)日：2010-12-30

申请号：US12492407

申请日：2009-06-26

Applicant: Pushp Trikha ,  Tzu-wang Pan ,  Eugene Yang ,  Yi Zeng ,  I-Hsiang Lin ,  Tg Vishwanath

Inventor： Pushp Trikha ,  Tzu-wang Pan ,  Eugene Yang ,  Yi Zeng ,  I-Hsiang Lin ,  Tg Vishwanath

IPC: H04B1/18

CPC classification number: H04H20/57 ,  H04H40/45

Abstract: A frequency modulation (FM) transmitter implemented with a delta-sigma modulator and a phase-locked loop (PLL) is described. The delta-sigma modulator receives a modulating signal (e.g., an FM stereo multiplex (MPX) signal) and provides a modulator output signal. The PLL performs frequency modulation based on the modulator output signal and provides an FM signal. The FM transmitter may further include a gain/phase compensation unit and a scaling unit. The compensation unit may compensate the modulating signal for the closed-loop response of the PLL. The scaling unit may scale the amplitude of the modulating signal based on a gain to obtain a target frequency deviation for the FM signal. The PLL may operate in a transmit mode or a receive mode, may perform frequency modulation in the transmit mode, and may provide a local oscillator (LO) signal at a fixed frequency in the receive mode.

Abstract translation: 描述了用Δ-Σ调制器和锁相环（PLL）实现的频率调制（FM）发射机。 Δ-Σ调制器接收调制信号（例如，FM立体声多路复用（MPX）信号），并提供调制器输出信号。 PLL根据调制器输出信号进行调频，并提供FM信号。 FM发射机还可以包括增益/相位补偿单元和缩放单元。 补偿单元可以补偿PLL的闭环响应的调制信号。 缩放单元可以基于增益来调整调制信号的幅度，以获得FM信号的目标频率偏差。 PLL可以以发送模式或接收模式工作，可以在发送模式下执行频率调制，并且可以在接收模式下以固定频率提供本地振荡器（LO）信号。

公开(公告)号：US20090130994A1

公开(公告)日：2009-05-21

申请号：US11947597

申请日：2007-11-29

Applicant: Wei Zhuo ,  Aristotele Hadjichristos ,  Tzu-wang Pan

Inventor： Wei Zhuo ,  Aristotele Hadjichristos ,  Tzu-wang Pan

IPC: H04B1/40 ,  H04B1/04

CPC classification number: H04B1/109 ,  H04B1/525

Abstract: A communication device includes a transmitter and a receiver. The receiver mixes a local oscillator (LO) signal with the received signal to downconvert the received signal to an intermediate frequency (IF). The LO path that feeds the LO signal to the downconverting mixer is controlled based on the transmit power of the transmitter. For high transmit power, the drive of the LO path is increased, thereby increasing the signal-to-noise ratio of the LO signal input into the mixer. For low transmit power levels, the drive to the LO path is decreased, reducing power consumption in the communication device. In this way, receiver path noise due to mixing of the LO phase noise with the self-generated transmitter signal is selectively controlled while incurring lower power consumption penalty. The communication device may be an access terminal configured for communication with a cellular radio network.

Abstract translation: 通信设备包括发射机和接收机。 接收器将本地振荡器（LO）信号与接收到的信号混合，以将接收到的信号下变频到中频（IF）。 基于发射机的发射功率来控制将LO信号馈送到下变频混频器的LO路径。 对于高发射功率，LO路径的驱动增加，从而增加输入混频器的LO信号的信噪比。 对于低发射功率电平，降低LO路径的驱动，从而降低通信设备的功耗。 以这种方式，由于LO相位噪声与自发送发射机信号的混合引起的接收机路径噪声被选择性地控制，同时产生较低的功耗损失。 通信设备可以是被配置为与蜂窝无线电网络进行通信的接入终端。