公开(公告)号：US07924069B2

公开(公告)日：2011-04-12

申请号：US11560678

申请日：2006-11-16

申请人： Chiewcharn Narathong ,  Wenjun Su

发明人： Chiewcharn Narathong ,  Wenjun Su

IPC分类号： H03B19/00

CPC分类号： H03K23/667 ,  H03K21/10 ,  H03L7/1976

摘要： A multi-modulus divider (MMD) receives an MMD input signal and outputs an MMD output signal SOUT. The MMD includes a chain of modulus divider stages (MDSs). Each MDS receives an input signal, divides it by either two or three, and outputs the result as an output signal. Each MDS responds to its own modulus control signal that controls whether it divides by two or three. In one example, a sequential logic element outputs SOUT. The low jitter modulus control signal of one of the first MDS stages of the chain is used to place a sequential logic element into a first state. The output signal of one of the MDS stages in the middle of the chain is used to place the sequential logic element into a second state. Power consumption is low because the sequential logic element is not clocked at the high frequency of the MMD input signal.

摘要翻译： 多模式分频器（MMD）接收MMD输入信号并输出​​MMD输出信号SOUT。 MMD包括模数分频器级链（MDS）。 每个MDS接收一个输入信号，将其分为两个或三个，并输出结果作为输出信号。 每个MDS响应自己的模数控制信号，控制它是否被二或三除。 在一个示例中，顺序逻辑元件输出SOUT。 链的第一MDS级之一的低抖动模数控制信号用于将顺序逻辑元件置于第一状态。 链中间的MDS级之一的输出信号用于将顺序逻辑元件置于第二状态。 功耗很低，因为顺序逻辑元件不在MMD输入信号的高频时钟。

公开(公告)号：US20090315621A1

公开(公告)日：2009-12-24

申请号：US12143669

申请日：2008-06-20

申请人： Chiewcharn Narathong ,  Sankaran Aniruddhan ,  Wenjun Su

发明人： Chiewcharn Narathong ,  Sankaran Aniruddhan ,  Wenjun Su

IPC分类号： H03F1/14 ,  H03F3/68

CPC分类号： H03F1/3276 ,  H03F1/301 ,  H03F1/308 ,  H03F1/3241 ,  H03F3/245 ,  H03F3/3022 ,  H03F2200/336 ,  H03F2200/451 ,  H03F2200/453 ,  H03F2203/30099 ,  H03F2203/30132 ,  H03F2203/7231

摘要： Techniques are disclosed for extending an amplifier's linear operating range by concatenating an amplifier exhibiting gain compression with a gain expansion stage. In an exemplary embodiment, a gain expansion stage incorporates a Class-B stage, a Class-AB stage, or a combination of the two. In an exemplary embodiment, both the gain compression stage and gain expansion stage are provided with a replica current biasing scheme to ensure stable biasing current over variations in temperature, process, and/or supply voltage. Further disclosed is an output voltage biasing scheme to set the DC output voltage to ensure maximum linear operating range.

摘要翻译： 公开了通过将展现增益压缩的放大器与增益扩展级相连接来扩展放大器的线性工作范围的技术。 在示例性实施例中，增益扩展阶段包括B类阶段，AB类阶段或两者的组合。 在示例性实施例中，增益压缩级和增益扩展级均被提供有复制电流偏置方案，以确保温度，过程和/或电源电压变化的稳定的偏置电流。 进一步公开了一种用于设置直流输出电压以确保最大线性工作范围的输出电压偏置方案。

公开(公告)号：US20080042699A1

公开(公告)日：2008-02-21

申请号：US11560973

申请日：2006-11-17

申请人： Chiewcharn Narathong ,  Wenjun Su

发明人： Chiewcharn Narathong ,  Wenjun Su

IPC分类号： H03B19/00

CPC分类号： H03K23/54

摘要： A modulus divider stage (MDS) includes first and second stages. The MDS receives a modulus divisor control signal S that determines whether the MDS stage operates in a divide-by-two mode or a divide-by-three mode. The MDS stage also receives a feedback modulus control signal from another MDS. When in the divide-by-two mode, the MDS divides by two regardless of the feedback modulus control signal. To conserve power, the first stage is unpowered when the MDS stage operates in the divide-by-two mode. When in the divide-by-three mode, the MDS stage either divides by two or by three depending on the feedback modulus control signal. To further reduce power consumption, the first stage is unpowered when the MDS stage is in the divide-by-three mode but is nonetheless performing a divide-by-two operation. A power-down transistor holds the output of the first stage at the proper logic level when the first stage is unpowered.

摘要翻译： 模数分频器级（MDS）包括第一级和第二级。 MDS接收模数除数控制信号S，其确定MDS级是以二分模式还是三分模式操作。 MDS级还接收来自另一MDS的反馈模数控制信号。 在二分模式下，无论反馈模数控制信号如何，MDS除以二。 为了节省功率，当MDS阶段以二分模式运行时，第一级无功。 在三分频模式下，根据反馈模数控制信号，MDS级分为2或3。 为了进一步降低功耗，当MDS级处于三分频模式时，第一级没有动力，但仍然执行一个二分之一的操作。 当第一级无功时，掉电​​晶体管将第一级的输出保持在适当的逻辑电平。

公开(公告)号：US09559639B2

公开(公告)日：2017-01-31

申请号：US12715250

申请日：2010-03-01

申请人： Wenjun Su ,  Aristotele Hadjichristos ,  Gurkanwal S. Sahota ,  Marco Cassia

发明人： Wenjun Su ,  Aristotele Hadjichristos ,  Gurkanwal S. Sahota ,  Marco Cassia

IPC分类号： H04B1/04 ,  H03F1/52 ,  H03F3/24 ,  H03G3/30

CPC分类号： H03F1/52 ,  H03F3/24 ,  H03F2200/435 ,  H03F2200/78 ,  H03G3/3042 ,  H04B2001/0408

摘要： Techniques for protecting a power amplifier (PA) are described. In an exemplary design, an apparatus includes (i) a PA module to amplify an input RF signal and provide an output RF signal and (ii) a protection circuit to control a transmitter gain to protect the PA module against high peak voltage. In an exemplary design, the protection circuit includes a set of comparators to quantize an analog input signal and provide digital comparator output signals used to adjust the transmitter gain. In another exemplary design, the protection circuit reduces and increases the transmitter gain with hysteresis. In yet another exemplary design, the protection circuit has faster response to rising amplitude than falling amplitude of the output RF signal. The hysteresis and/or the different rise and fall responses may allow the protection circuit to avoid toggling the transmitter gain under severe load mismatch and to handle time-varying envelope due to amplitude modulation.

摘要翻译： 描述了用于保护功率放大器（PA）的技术。 在示例性设计中，装置包括（i）PA模块，用于放大输入RF信号并提供输出RF信号，以及（ii）保护电路以控制发射机增益以保护PA模块免受高峰值电压。 在示例性设计中，保护电路包括一组比较器，用于量化模拟输入信号并提供用于调整发射机增益的数字比较器输出信号。 在另一示例性设计中，保护电路通过滞后减小并增加发射机增益。 在又一示例性设计中，保护电路比对输出RF信号的下降幅度具有对振幅上升的响应更快。 迟滞和/或不同的上升和下降响应可以允许保护电路避免在严重负载不匹配的情况下切换发射机增益，并且由于幅度调制来处理时变包络。

公开(公告)号：US08310277B2

公开(公告)日：2012-11-13

申请号：US12718806

申请日：2010-03-05

申请人： Wenjun Su ,  Aristotele Hadjichristos ,  Marco Cassia ,  Chiewcharn Narathong

发明人： Wenjun Su ,  Aristotele Hadjichristos ,  Marco Cassia ,  Chiewcharn Narathong

IPC分类号： H03K5/153

CPC分类号： G01R19/04

摘要： A high linear fast peak detector having a variable bias current and/or a variable bias voltage is described. In an exemplary design, the peak detector includes a transistor, a variable current source, a capacitor, and a feedback circuit. The transistor receives the input signal and provides a source current. The variable current source receives the input signal, provides high bias current when the input signal is low, and provides low bias current when the input signal is high. The capacitor is charged by the source current when the input signal is high and is discharged by the high bias current when the input signal is low. The feedback circuit receives a detected signal from the capacitor and provides higher bias voltage for the transistor when the input signal is high, which results in higher source current from the transistor.

摘要翻译： 描述具有可变偏置电流和/或可变偏置电压的高线性快速峰值检测器。 在示例性设计中，峰值检测器包括晶体管，可变电流源，电容器和反馈电路。 晶体管接收输入信号并提供源极电流。 可变电流源接收输入信号，当输入信号为低电平时提供高偏置电流，并且当输入信号为高电平时提供低偏置电流。 当输入信号为高电平时，电容器由电源电流充电，当输入信号为低电平时，电容器被高偏置电流放电。 当输入信号为高电平时，反馈电路接收来自电容器的检测信号，并为晶体管提供较高的偏置电压，这导致来自晶体管的较高的源极电流。

公开(公告)号：US20110050285A1

公开(公告)日：2011-03-03

申请号：US12718806

申请日：2010-03-05

申请人： Wenjun Su ,  Aristotele Hadjichristos ,  Marco Cassia ,  Chiewcham Narathong

发明人： Wenjun Su ,  Aristotele Hadjichristos ,  Marco Cassia ,  Chiewcham Narathong

IPC分类号： G01R19/04

CPC分类号： G01R19/04

摘要： A high linear fast peak detector having a variable bias current and/or a variable bias voltage is described. In an exemplary design, the peak detector includes a transistor, a variable current source, a capacitor, and a feedback circuit. The transistor receives the input signal and provides a source current. The variable current source receives the input signal, provides high bias current when the input signal is low, and provides low bias current when the input signal is high. The capacitor is charged by the source current when the input signal is high and is discharged by the high bias current when the input signal is low. The feedback circuit receives a detected signal from the capacitor and provides higher bias voltage for the transistor when the input signal is high, which results in higher source current from the transistor.

摘要翻译： 描述具有可变偏置电流和/或可变偏置电压的高线性快速峰值检测器。 在示例性设计中，峰值检测器包括晶体管，可变电流源，电容器和反馈电路。 晶体管接收输入信号并提供源极电流。 可变电流源接收输入信号，当输入信号为低电平时提供高偏置电流，并且当输入信号为高电平时提供低偏置电流。 当输入信号为高电平时，电容器由电源电流充电，当输入信号为低电平时，电容器被高偏置电流放电。 当输入信号为高电平时，反馈电路接收来自电容器的检测信号，并为晶体管提供更高的偏置电压，这导致来自晶体管的较高的源极电流。

公开(公告)号：US07379522B2

公开(公告)日：2008-05-27

申请号：US11472824

申请日：2006-06-21

申请人： Chiewcharn Narathong ,  Wenjun Su

发明人： Chiewcharn Narathong ,  Wenjun Su

IPC分类号： H03K21/00 ,  H03K23/00

CPC分类号： H03L7/1976 ,  H03L7/0802

摘要： Within a mobile communication device (for example, a cellular telephone), there is a local oscillator. The local oscillator includes a novel frequency divider that includes a novel configurable multi-modulus divider (CMMD). The frequency divider is configurable into a selectable one of multiple configurations involving different mixes of synchronous and asynchronous circuitry. In each configuration, the frequency divider produces an amount of noise and consumes an amount of power. Power consumption is loosely inversely related to noise produced in that the modes with the highest power consumption produce the least amount of noise, and vice versa. The mobile communication device is operable in one of multiple different communication standards (for example, GSM, CDMA1X and WCDMA). The different communication standards impose different noise requirements on the frequency divider. By using the lowest power configuration that satisfies the noise requirements of the standard being used, power consumption of the cellular telephone is reduced.

摘要翻译： 在移动通信设备（例如，蜂窝电话）内，存在本地振荡器。 本地振荡器包括一种新颖的分频器，其包括新颖的可配置多模分频器（CMMD）。 分频器可配置为包括不同混频器的同步和异步电路的多种配置之一。 在每个配置中，分频器产生一定量的噪声并消耗一定的功率。 功耗与产生的噪声松散地负相关，因为功耗最大的模式产生的噪声最小，反之亦然。 移动通信设备可以在多个不同通信标准（例如，GSM，CDMA1X和WCDMA）之一中操作。 不同的通信标准对分频器施加不同的噪声要求。 通过使用满足所使用的标准的噪声要求的最低功率配置，蜂窝电话的功耗降低。

公开(公告)号：US20160254793A1

公开(公告)日：2016-09-01

申请号：US15029777

申请日：2014-11-05

申请人： Wenjun SU ,  Guangming YIN ,  Quanqing ZHU ,  QUALCOMM INCORPORATED

发明人： Wenjun SU ,  Guangming YIN ,  Quanqing ZHU

IPC分类号： H03F3/45 ,  H03K5/12

CPC分类号： H03F3/45762 ,  H03F1/0277 ,  H03F3/211 ,  H03F3/45183 ,  H03F3/45609 ,  H03F3/72 ,  H03F2200/555 ,  H03F2200/72 ,  H03F2203/45288 ,  H03F2203/45301 ,  H03F2203/45511 ,  H03F2203/45638 ,  H03F2203/45644 ,  H03F2203/45702 ,  H03K5/12

摘要： Methods, apparatus, and means for maintaining a low output common-mode voltage in a driver are provided. One example apparatus includes a first differential amplifier stage configured to provide a differential output for the apparatus; and a second differential amplifier stage configured to drive the first differential amplifier stage, the second differential amplifier stage including a pair of pre-driver amplifiers, a pair of n-stage circuits, and an input skew averaging circuit, wherein each of the pair of n-stage units is split into two half blocks. The input skew averaging circuit is configured to suppress the output common-mode voltage by driving the blocks with complementary digital inputs to average out a skew in a gate-to-source voltage of the pair of n-stage circuits. For certain aspects, two feed-forward capacitors may be added to enhance the transconductance and operating speed of main transistors of the first differential amplifier stage.

摘要翻译： 提供了用于在驱动器中维持低输出共模电压的方法，装置和装置。 一个示例性设备包括：第一差分放大器级，被配置为提供用于该设备的差分输出; 以及第二差分放大器级，被配置为驱动所述第一差分放大器级，所述第二差分放大器级包括一对预驱动器放大器，一对n级电路和输入偏差平均电路，其中， n级单元分为两个半块。 输入偏斜平均电路被配置为通过用互补数字输入驱动块来抑制输出共模电压，以平均一对n级电路的栅极至源极电压的偏移。 对于某些方面，可以添加两个前馈电容器以增强第一差分放大器级的主晶体管的跨导和工作速度。

公开(公告)号：US08779859B2

公开(公告)日：2014-07-15

申请号：US13570062

申请日：2012-08-08

申请人： Wenjun Su ,  Chiewcharn Narathong ,  Guangming Yin ,  Aristotele Hadjichristos

发明人： Wenjun Su ,  Chiewcharn Narathong ,  Guangming Yin ,  Aristotele Hadjichristos

IPC分类号： H03F1/22

CPC分类号： H03F1/223 ,  H03F3/193

摘要： Techniques for generating bias voltages for a multi-cascode amplifier. In an aspect, a multi-cascode bias network is provided, each transistor in the bias network being a replica of a corresponding transistor in the multi-cascode amplifier, enabling accurate biasing of the transistors in the multi-cascode amplifier. In another aspect, a voltage supply for the multi-cascode amplifier is provided separately from a voltage supply for the replica bias network, to advantageously decouple variations in the amplifier voltage supply from the bias network voltage supply. In yet another aspect, the bias voltages of transistors in the multi-cascode amplifier may be configured by adjusting the impedance of resistive voltage dividers coupled to the transistor gate biases. As the gain of the amplifier depends on the bias voltages of the cascode amplifiers, the gain of the amplifier may be adjusted in this manner without introducing a variable gain element directly in the amplifier signal path.

摘要翻译： 用于产生多共源共栅放大器偏置电压的技术。 在一方面，提供了一种多共源共栅偏压网络，偏置网络中的每个晶体管是多共源共栅放大器中对应的晶体管的复制品，使多级共源共栅放大器中的晶体管能够精确偏置。 在另一方面，用于多重共源共栅放大器的电压源与用于复制偏压网络的电压源分开提供，以有利地将放大器电压源与偏置网络电压源的变化分离。 在另一方面，多并联放大器中的晶体管的偏置电压可以通过调整耦合到晶体管栅极偏置的电阻分压器的阻抗来配置。 由于放大器的增益取决于共源共栅放大器的偏置电压，所以可以以这种方式调节放大器的增益，而不将可变增益元件直接引入放大器信号路径。

公开(公告)号：US08688058B2

公开(公告)日：2014-04-01

申请号：US12277022

申请日：2008-11-24

申请人： Chiewcharn Narathong ,  Wenjun Su

发明人： Chiewcharn Narathong ,  Wenjun Su

IPC分类号： H04B1/04

CPC分类号： H03G3/3042 ,  H03F1/56

摘要： Exemplary embodiment are directed to preserving transmitter linearity in RF transceivers while reducing RX band noise for use with low-power voltage supplies. In one aspect, a programmable attenuation element may be provided on-chip at the output of a driver amplifier, prior to a matching network. In another aspect, the programmable attenuation element may include a plurality of switchable capacitors.

摘要翻译： 示例性实施例涉及在RF收发器中保持发射机线性度，同时降低用于低功率电源的RX频带噪声。 在一个方面，可以在匹配网络之前在驱动器放大器的输出处片上设置可编程衰减元件。 在另一方面，可编程衰减元件可以包括多个可切换电容器。