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21. 发明授权

US08639205B2 Reduced power-consumption receivers 失效
标题翻译：降低功耗的接收机
公开(公告)号：US08639205B2
公开(公告)日：2014-01-28
申请号：US12052657
申请日：2008-03-20
申请人： Junxiong Deng , Aristotele Hadjichristos , Aleksandar Tasic , Frederic Bossu
发明人： Junxiong Deng , Aristotele Hadjichristos , Aleksandar Tasic , Frederic Bossu
IPC分类号： H04B1/26
CPC分类号： H04W52/0206 , H03G3/20 , H04B1/16
摘要： An exemplary embodiment disclosed comprises a mixer having a plurality of input leads; a first degenerative impedance element coupled to a first input lead of the mixer; a second degenerative impedance element coupled to a second input lead of the mixer; and a local oscillator (LO) system comprising a plurality of duty cycle modes to generate a LO signal for the mixer, the local oscillator system operates in a first duty cycle based on a first gain state of the mixer, and in a second duty cycle based on a second gain state of the mixer.
摘要翻译：公开的示例性实施例包括具有多个输入引线的混合器; 耦合到混合器的第一输入引线的第一退化阻抗元件; 耦合到混合器的第二输入引线的第二退化阻抗元件; 以及本地振荡器（LO）系统，其包括多个占空比模式以产生混频器的LO信号，本地振荡器系统基于混频器的第一增益状态在第一占空比中工作，并且在第二占空比基于混频器的第二增益状态。

22. 发明授权

US08472890B2 Adjustable local oscillator path in a communication device with a transmitter 有权
标题翻译：具有发射机的通信设备中的可调本地振荡器路径
公开(公告)号：US08472890B2
公开(公告)日：2013-06-25
申请号：US11947597
申请日：2007-11-29
申请人： Wei Zhuo , Aristotele Hadjichristos , Tzu-wang Pan
发明人： Wei Zhuo , Aristotele Hadjichristos , Tzu-wang Pan
IPC分类号： H04B1/40
CPC分类号： H04B1/109 , H04B1/525
摘要： 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.
摘要翻译：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。

23. 发明授权

US08150339B2 Switchable-level voltage supplies for multimode communications 有权
标题翻译：用于多模通信的可切换电平电压源
公开(公告)号：US08150339B2
公开(公告)日：2012-04-03
申请号：US11935200
申请日：2007-11-05
申请人： Marco Cassia , Aristotele Hadjichristos
发明人： Marco Cassia , Aristotele Hadjichristos
IPC分类号： H04B1/04 , H04M1/00
CPC分类号： H04B1/0475 , H03F1/02 , H03F1/0244 , H03F3/24 , H03F3/45475 , H03F2203/45731 , H04B1/0057 , H04B1/406 , H04B2001/045
摘要： Switchable voltage level supplies for circuitry in a multi-mode communications chipset are disclosed. In an embodiment, a first voltage level is supplied to TX circuitry operating in a first mode having a first set of linearity and/or noise requirements. A second voltage level lower than the first voltage level is supplied to TX circuitry operating in a second mode having a second set of linearity and/or noise requirements looser than the first set of requirements. The first mode may be operation according to the GSM standard, and the second mode may be operation according to the W-CDMA standard.
摘要翻译：公开了一种用于多模式通信芯片组中的电路的可切换电压电平。在一个实施例中，向具有第一组线性和/或噪声要求的第一模式工作的TX电路提供第一电压电平。低于第一电压电平的第二电压电平被提供给具有比第一组要求松动的第二组线性和/或噪声要求的第二模式工作的TX电路。第一模式可以是根据GSM标准的操作，并且第二模式可以是根据W-CDMA标准的操作。

24. 发明申请

US20110025422A1 POWER AMPLIFIER BIAS CURRENT MONITOR AND CONTROL MECHANISM 有权
标题翻译：功率放大器偏置电流监测和控制机制
公开(公告)号：US20110025422A1
公开(公告)日：2011-02-03
申请号：US12704432
申请日：2010-02-11
申请人： Thomas D. Marra , Aristotele Hadjichristos , Nathan M. Pietcher
发明人： Thomas D. Marra , Aristotele Hadjichristos , Nathan M. Pietcher
IPC分类号： H03F3/18 , H03M1/12
CPC分类号： H03F1/301 , H03F1/30 , H03F3/04 , H03F3/189
摘要： Techniques for monitoring and controlling bias current of amplifiers are described. In an exemplary design, an apparatus may include an amplifier and a bias circuit. The amplifier may include at least one transistor coupled to an inductor. The bias circuit may generate at least one bias voltage for the at least one transistor in the amplifier to obtain a target bias current for the amplifier. The bias circuit may generate the at least one bias voltage based on a voltage across the inductor in the amplifier, or a current through a current mirror formed with one of the at least one transistor in the amplifier, or a gate-to-source voltage of one of the at least one transistor in the amplifier, or a voltage in a replica circuit replicating the amplifier, or a current applied to the amplifier with a switched mode power supply disabled.
摘要翻译：描述了用于监视和控制放大器偏置电流的技术。在示例性设计中，装置可以包括放大器和偏置电路。放大器可以包括耦合到电感器的至少一个晶体管。偏置电路可以为放大器中的至少一个晶体管产生至少一个偏置电压，以获得放大器的目标偏置电流。偏置电路可以基于放大器中的电感器两端的电压或通过放大器中的至少一个晶体管中的一个形成的电流镜的电流或栅极至源极电压来产生至少一个偏置电压放大器中的至少一个晶体管中的一个，或复制放大器的复制电路中的电压，或禁用开关模式电源的施加到放大器的电流。

25. 发明申请

US20090130994A1 ADJUSTABLE LOCAL OSCILLATOR PATH IN A COMMUNICATION DEVICE WITH A TRANSMITTER 有权
标题翻译：在具有发射机的通信设备中可调谐的本地振荡器路径
公开(公告)号：US20090130994A1
公开(公告)日：2009-05-21
申请号：US11947597
申请日：2007-11-29
申请人： Wei Zhuo , Aristotele Hadjichristos , Tzu-wang Pan
发明人： Wei Zhuo , Aristotele Hadjichristos , Tzu-wang Pan
IPC分类号： H04B1/40 , H04B1/04
CPC分类号： H04B1/109 , H04B1/525
摘要： 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.
摘要翻译：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。

26. 发明授权

US07333778B2 System and method for current-mode amplitude modulation 有权
标题翻译：电流模式幅度调制的系统和方法
公开(公告)号：US07333778B2
公开(公告)日：2008-02-19
申请号：US10889567
申请日：2004-07-12
申请人： David R. Pehlke , Aristotele Hadjichristos
发明人： David R. Pehlke , Aristotele Hadjichristos
IPC分类号： H04B1/04 , H03F3/38
CPC分类号： H03C1/06 , H03C5/00 , H03F1/02 , H03F1/0222 , H03F1/0261 , H03F1/32 , H03F3/24 , H03F2200/324 , H03F2200/456 , H03F2200/504 , H04B1/04 , H04B1/0483 , H04B2001/045 , H04B2001/0491
摘要： An amplifier circuit includes a power amplifier biased for saturated mode operation, and a controllable current source to provide supply current to the power amplifier. The controllable current source effects desired amplitude modulation of the output signal from the power amplifier by modulating the supply current it provides responsive to an amplitude information signal. In one or more embodiments, the current source includes a circuit that is configured to adjust one or more transmitter operating parameters responsive to detecting changes in the effective DC resistance of the power amplifier. For example, the circuit may generate a compensation signal that reduces the effective DC resistance responsive to detecting that the effective DC resistance has undesirably increased. By way of non-limiting examples, such compensation may be effected by changing a current mirror, an amplifier-to-antenna impedance matching, an amplifier bias or device size, or imposing some form of transmit signal back-off.
摘要翻译：放大器电路包括偏置用于饱和模式操作的功率放大器和可控电流源，以向功率放大器提供电源电流。可控电流源通过调制其响应于幅度信息信号提供的电源电流来影响来自功率放大器的输出信号的期望幅度调制。在一个或多个实施例中，电流源包括被配置为响应于检测功率放大器的有效直流电阻的变化来调整一个或多个发射器操作参数的电路。例如，电路可以响应于检测到有效DC电阻不期望地增加而产生降低有效DC电阻的补偿信号。作为非限制性示例，可以通过改变电流镜，放大器到天线阻抗匹配，放大器偏置或器件尺寸或者施加某种形式的发射信号反馈来实现这种补偿。

27. 发明申请

US20080014896A1 SYSTEMS, METHODS, AND APPARATUS FOR FREQUENCY CONVERSION 有权
标题翻译：用于频率转换的系统，方法和装置
公开(公告)号：US20080014896A1
公开(公告)日：2008-01-17
申请号：US11531314
申请日：2006-09-13
申请人： Wei Zhuo , Aristotele Hadjichristos , Gurkanwal S. Sahota , Solti Peng
发明人： Wei Zhuo , Aristotele Hadjichristos , Gurkanwal S. Sahota , Solti Peng
IPC分类号： H04B1/26
CPC分类号： H03D7/166 , H03H19/008 , H03H2007/0192
摘要： A method according to one embodiment includes using a quadrature set of local oscillator signals having duty cycles of substantially less than fifty percent to perform a mixing operation on a radio-frequency current signal. Other embodiments include using a quadrature set of local oscillator signals having duty cycles of less than twenty-five percent.
摘要翻译：根据一个实施例的方法包括使用具有基本上小于百分之五十的占空比的本地振荡器信号的正交组来对射频电流信号执行混频操作。其他实施例包括使用占空比小于百分之二十五的本地振荡器信号的正交集合。

28. 发明授权

US09559639B2 Protection circuit for power amplifier 有权
标题翻译：功率放大器保护电路
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。

29. 发明授权

US09450665B2 Diversity receiver for wireless communication 有权
标题翻译：用于无线通信的分集接收机
公开(公告)号：US09450665B2
公开(公告)日：2016-09-20
申请号：US11548596
申请日：2006-10-11
申请人： Wesley Alan Sampson , Aristotele Hadjichristos , Gurkanwal S Sahota
发明人： Wesley Alan Sampson , Aristotele Hadjichristos , Gurkanwal S Sahota
IPC分类号： H04B7/10 , H04B7/08 , H04W88/06
CPC分类号： H04B7/0822 , H04B1/006 , H04B7/0825 , H04B7/0831 , H04B7/0871 , H04W88/06
摘要： A diversity receiver capable of receiving a CDMA system (e.g., a W-CDMA system) and a TDMA system (e.g., a GSM system), with receive diversity for at least one system, is described. W-CDMA is often referred to as UMTS. In one design, the diversity receiver includes a first receiver for GSM and a second receiver for UMTS. The first receiver may be implemented with one receiver design, may be spec-compliant for GSM, and may also support UMTS. The second receiver may be implemented with another receiver design, may be spec-compliant for UMTS, and may also support GSM. The first receiver may include a lowpass filter having a bandwidth that is adjustable for GSM and UMTS. The second receiver may include a bandpass filter used to attenuate a transmit frequency range for UMTS. Each receiver may include circuit blocks that are used for both GSM and UMTS.
摘要翻译：描述了能够接收具有用于至少一个系统的接收分集的CDMA系统（例如，W-CDMA系统）和TDMA系统（例如，GSM系统）的分集接收机。 W-CDMA通常被称为UMTS。在一种设计中，分集接收机包括用于GSM的第一接收机和用于UMTS的第二接收机。第一接收机可以用一个接收机设计来实现，可以对GSM进行规范兼容，并且还可以支持UMTS。第二接收机可以用另一个接收机设计来实现，可以对UMTS进行规范兼容，并且还可以支持GSM。第一接收机可以包括具有可针对GSM和UMTS调整的带宽的低通滤波器。第二接收机可以包括用于衰减UMTS的发射频率范围的带通滤波器。每个接收机可以包括用于GSM和UMTS的电路块。

30. 发明授权

US08310277B2 High linear fast peak detector 有权
标题翻译：高线性快速峰值检测器
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。

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