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1.发明授权公开(公告)号：US07236810B1
公开(公告)日：2007-06-26
申请号：US09164432
申请日：1998-09-30
CPC分类号： H04W52/029 , Y02D70/122 , Y02D70/164
摘要： A low frequency timing circuit is used to reestablish a timing signal in a high-frequency timing circuit after the high frequency timing circuit has lost and regained power. The timing of the low frequency circuit is measured against the timing of the high frequency circuit before the high frequency circuit has lost power. The low frequency circuit then is used to measure time after the high frequency circuit has lost power. Once the high frequency circuit has regained power, its timing signal is reestablished at an appropriate time based on a time measurement obtained from the low frequency circuit.
摘要翻译： 低频定时电路用于在高频定时电路丢失并恢复供电之后重新建立高频定时电路中的定时信号。 在高频电路断电之前，针对高频电路的定时测量低频电路的定时。 然后，低频电路用于在高频电路断电后测量时间。 一旦高频电路恢复供电，其定时信号就会根据从低频电路获得的时间测量值在适当的时间重新建立。
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公开(公告)号：US07155176B2
公开(公告)日：2006-12-26
申请号：US10820252
申请日：2004-04-08
申请人： Jaleh Komaili , Darioush Agahi , Ricke W. Clark
发明人： Jaleh Komaili , Darioush Agahi , Ricke W. Clark
IPC分类号： H04B1/40
CPC分类号： H04B7/2662 , H04B7/2675 , H04L27/2332 , H04L2027/0065 , H04W56/0035
摘要： A system for synchronizing a portable transceiver to a network is disclosed. Embodiments of the system for synchronizing a portable transceiver to a network include a crystal oscillator, a frequency synthesizer adapted to receive an output of the crystal oscillator, logic coupled to the crystal oscillator, the logic configured to estimate a frequency error of a received signal; and a first control signal supplied from the logic to the frequency synthesizer, the first control signal configured to adjust the frequency synthesizer to compensate for the error.
摘要翻译： 公开了一种用于将便携式收发器同步到网络的系统。 用于将便携式收发器同步到网络的系统的实施例包括晶体振荡器，适于接收晶体振荡器的输出的频率合成器，耦合到晶体振荡器的逻辑，被配置为估计接收信号的频率误差的逻辑; 以及从逻辑提供给频率合成器的第一控制信号，第一控制信号被配置为调整频率合成器以补偿误差。
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公开(公告)号：US06754287B2
公开(公告)日：2004-06-22
申请号：US09814196
申请日：2001-03-21
申请人： Paul A. Underbrink , Daryush Shamlou , Ricke W. Clark , Joseph H. Colles , Guangming Yin , Patrick D. Ryan , Kelly H. Hale
发明人： Paul A. Underbrink , Daryush Shamlou , Ricke W. Clark , Joseph H. Colles , Guangming Yin , Patrick D. Ryan , Kelly H. Hale
IPC分类号： H04L2720
CPC分类号： H03F3/217 , H03F2200/331 , H04L27/2046
摘要： Communications systems, and particularly portable personal communications systems, such as portable phones, are becoming increasingly digital. One area that has remained largely analog, however, is the modulation and RF amplifier circuits. To produce a RF frequency waveform. An output of a class D amplifier is coupled to an integrator to create an analog signal. A resonant circuit shapes an output waveform based on the analog signal to create a sinusoidal RF broadcast signal. The waveform of the class D amplifier may be duty cycle modulated. Digital modulation may occur using a digital sigma delta modulator or a digital programmable divide modulator. Using the digital modulation techniques and class D amplification techniques together allows for broadcast a PSK signal that has been decomposed into amplitude and phase components.
摘要翻译： 通信系统，特别是诸如便携式电话的便携式个人通信系统正在变得越来越数字化。 然而，仍然是模拟的一个领域是调制和RF放大器电路。 产生RF频率波形。 D类放大器的输出耦合到积分器以产生模拟信号。 谐振电路基于模拟信号对输出波形进行整形以产生正弦RF广播信号。 D类放大器的波形可以是占空比调制的。 可以使用数字Σ-Δ调制器或数字可编程分频调制器进行数字调制。 一起使用数字调制技术和D类放大技术可以广播已经分解为幅度和相位分量的PSK信号。
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公开(公告)号：US06535735B2
公开(公告)日：2003-03-18
申请号：US09814921
申请日：2001-03-22
申请人： Paul A. Underbrink , Daryush Shamlou , Ricke W. Clark , Joseph H. Colles , Guangming Yin , Patrick D. Ryan , Kelly H. Hale
发明人： Paul A. Underbrink , Daryush Shamlou , Ricke W. Clark , Joseph H. Colles , Guangming Yin , Patrick D. Ryan , Kelly H. Hale
IPC分类号： H04Q720
CPC分类号： G06F1/3203 , G06F1/324 , G06F1/3296 , Y02D10/126 , Y02D10/172
摘要： Modern digital integrated circuits are commonly synchronized in their workings by clock circuits. The clock frequency for a circuit must take into account the propagation delay of signals within the critical path of the circuit. If the clock time is not adequate to allow propagation of signals through the critical path, improper circuit operation may result. The propagation delay is not a constant from circuit to circuit, and even in a single circuit may change due to temperature, power supply voltage and the like. Commonly, this variation is handled by assuming a worse case propagation delay of the critical path, and then designing the clock frequency and minimum power supply voltage of the circuit so that the circuit will function under worst case conditions. However, instead of assuming a worse case propagation delay of the critical path, the propagation delay may be measured in an actual circuit path that has been constructed to be the equivalent to, or slightly worse than, the propagation delay of the critical path. By knowing the actual worst case propagation delay, the circuit may be modified to operate with lower power supply voltages, conserving power and/or to controlling the frequency of the clock, so that the clock may be operated at or near the circuit's actual, not theoretical worst case limit. Such modifications of power supply voltage and/or clock frequency may occur during circuit operation and thus, adapt the circuit to the different operating parameters of each circuit.
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公开(公告)号：US6078628A
公开(公告)日：2000-06-20
申请号：US40225
申请日：1998-03-13
申请人： Scott Griffith , Ricke W. Clark
发明人： Scott Griffith , Ricke W. Clark
CPC分类号： H04L27/361 , H04L27/2071
摘要： A constant envelope modulator and transmit architecture for a wireless communication system is provided and a method for operating the same. The constant envelope modulator includes a differential encoder which receives data to be transmitted and creates in-phase and quadrature components of a modulation signal to be transmitted. The in-phase and quadrature components are passed through digital filters in order to give the modulation a particular shape. The in-phase and quadrature components of the modulation signal have both phase information and amplitude information on the modulation, where the constant envelope modulator removes the amplitude modulation (AM) information from the modulation signal to provide constant envelope in-phase and quadrature modulation signals and an accompanying AM envelope signal. The resultant constant envelope in-phase and quadrature modulation signals are combined at a radio frequency for transmission into a constant envelope phase modulation signal. The constant envelope phase modulation signal is fed through a non-linear power amplifier to bring the modulation signal to a proper output power level for transmission. The AM content of the modulation signal is then reintroduced into the constant envelope phase modulation signal at the non-linear power amplifier after the point of amplification of the constant envelope phase modulation signal in order to reintroduce the amplitude information into the signal. The constant envelope modulator and transmit architecture of the present invention allows the entire structure to be operated in an efficient, non-linear mode.
摘要翻译： 提供了一种用于无线通信系统的恒定包络调制器和传输体系结构以及用于其的操作方法。 恒包络调制器包括差分编码器，其接收要发送的数据，并创建要发送的调制信号的同相和正交分量。 同相和正交分量通过数字滤波器，以使调制成为特定的形状。 调制信号的同相和正交分量具有关于调制的相位信息和振幅信息，其中恒包络调制器从调制信号中去除幅度调制（AM）信息，以提供恒定的包络同相和正交调制信号 和伴随的AM包络信号。 所得到的恒包络同相和正交调制信号以射频组合以便传输到恒定包络相位调制信号中。 恒定包络相位调制信号通过非线性功率放大器馈送，以使调制信号达到适当的输出功率电平进行传输。 然后，在恒定包络线相位调制信号的放大点之后，将调制信号的AM内容重新引入非线性功率放大器的恒定包络相位调制信号，以便将幅度信息重新引入到信号中。 本发明的恒定包络调制器和发射架构允许整个结构以有效的非线性模式操作。
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6.发明授权System for closed loop power control using a linear or a non-linear power amplifier 有权使用线性或非线性功率放大器进行闭环功率控制的系统公开(公告)号：US06670849B1
公开(公告)日：2003-12-30
申请号：US09650987
申请日：2000-08-30
IPC分类号： H03G320
CPC分类号： H03G3/3042 , H03F1/02 , H03F2200/294 , H03F2200/372 , H04W52/52
摘要： A system for a closed power control feedback loop allows for the use of a non-linear amplifier for amplifying a phase modulated (PM) signal while introducing an inverse version of the desired amplitude modulated (AM) signal into the feedback loop using a variable gain element. By introducing an inverse version of the desired AM portion of the signal into the power control feedback loop, the non-linear, and highly efficient, power amplifier may be used to amplify only the PM portion of the signal, while the AM portion is introduced by the power control feedback loop. In another aspect of the invention, an inverse version of the AM portion of the desired transmit signal is introduced into the power control feedback loop of an amplifier that is amplifying both a phase modulated signal and an amplitude modulated signal. By introducing an inverse version of the desired AM signal into the power control feedback loop, the power control feedback loop may not cancel the AM component present at the output of the power amplifier. In yet another aspect of the invention, the desired AM signal is injected into the feedback loop along with the power control reference signal.
摘要翻译： 用于闭合功率控制反馈回路的系统允许使用非线性放大器来放大相位调制（PM）信号，同时使用可变增益将所需幅度调制（AM）信号的逆版本引入反馈环路 元件。 通过将信号的期望的AM部分的逆版本引入功率控制反馈回路中，可以使用非线性和高效的功率放大器来仅放大信号的PM部分，同时引入AM部分 通过功率控制反馈回路。 在本发明的另一方面，将期望的发送信号的AM部分的逆版本引入放大器的功率控制反馈环路，该放大器正在放大相位调制信号和幅度调制信号。 通过将所需AM信号的逆版本引入功率控制反馈回路中，功率控制反馈回路可能不会消除存在于功率放大器输出端的AM分量。 在本发明的另一方面，所需的AM信号与功率控制参考信号一起被注入到反馈回路中。
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公开(公告)号：US06651021B2
公开(公告)日：2003-11-18
申请号：US09881932
申请日：2001-06-15
申请人： Paul A. Underbrink , Daryush Shamlou , Ricke W. Clark , Joseph H. Colles , Guangming Yin , Patrick D. Ryan , Kelly H. Hale
发明人： Paul A. Underbrink , Daryush Shamlou , Ricke W. Clark , Joseph H. Colles , Guangming Yin , Patrick D. Ryan , Kelly H. Hale
IPC分类号： G01R3500
CPC分类号： H04B1/109
摘要： The invention discloses a system for improving performance of the RF amplification stage of communication receivers by accounting for the signal environment of the RF amplifier. The linearity, gain and power supply voltage of the RF amplification stage of the communication receiver is adjusted to produce an optimal signal into the succeeding narrow-band amplification stage(s). The adjustment of the RF stage includes mechanisms such as adjusting the RF amplifier power supply level using a DC to DC converter. It also includes allowing distortion in the RF amplification stage if the distortion in the RF amplification stage does not affect the target signal. For example, if there were a strong signal that fell within the same band as the target signal, amplification would be allowed to be so high that it distorted the undesired signals, but not the tined signals. If the desired signal is the predominant signal, within the RF amplifier's band, then the amplifier gain may be increased only to the point where distortion is detected.
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公开(公告)号：US5586284A
公开(公告)日：1996-12-17
申请号：US547050
申请日：1995-10-23
CPC分类号： G06F9/355
摘要： The STREAMER FOR RISC DIGITAL SIGNAL PROCESSOR shown herein allows a CPU 46 to interface with a memory 60 via data registers 50. Pre-fetch and post-store of the correct address is determined by an address generator 58 according to a rule determined by a context register 52. An index indicative of this address is stored in an index register 54. The data, context, and index registers together form a streamer 56, streaming data between the CPU 46 and data memory 60. The rule of the context register 52 also drives a converter 62 for converting data between memory format and register format. The speed and flexibility of a RISC device is combined with the intensive memory access of a digital signal processor.
摘要翻译： 本文所示的用于RISC数字信号处理器的流程允许CPU 46经由数据寄存器50与存储器60接口。正确地址的预取和后存储由地址生成器58根据由上下文确定的规则来确定 指示该地址的索引被存储在索引寄存器54中。数据，上下文和索引寄存器一起形成流分送器56，在CPU 46和数据存储器60之间流传输数据。上下文寄存器52的规则也 驱动用于在存储器格式和寄存器格式之间转换数据的转换器62。 RISC设备的速度和灵活性与数字信号处理器的密集存储器访问相结合。
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9.发明授权Fast amplitude based pre-distortion calibration for a radio frequency power amplifier 有权射频功率放大器基于快速幅度的预失真校准公开(公告)号：US08913969B1
公开(公告)日：2014-12-16
申请号：US12785027
申请日：2010-05-21
IPC分类号： H04B1/04
CPC分类号： H04B1/04 , H03F1/3241 , H03F1/3288 , H04B17/13 , H04B2001/0425
摘要： The present disclosure relates to amplitude based pre-distortion calibration of an RF communications terminal, such as a cell phone, by transmitting a first standard RF transmit burst from the RF communications terminal to an RF test instrument, which assimilates the first standard RF transmit burst. A calibration control system extracts information regarding the first standard RF transmit burst from the RF test instrument; determines amplitude based distortion of the RF communications terminal using the extracted information; determines amplitude based pre-distortion calibration information using the determined amplitude based distortion; and calibrates the RF communications terminal using the amplitude based pre-distortion calibration information. By using a single-shot transmit burst, calibration times may be minimized. To calibrate the RF communications terminal at multiple transmit frequencies, multiple single-shot transmit bursts may be used, such that each single-shot transmit burst is at a different calibration frequency.
摘要翻译： 本公开涉及通过从RF通信终端向RF测试仪器发送第一标准射频发射脉冲串，RF通信终端（例如蜂窝电话）的基于幅度的预失真校准，其将第一标准RF发射脉冲串 。 校准控制系统从RF测试仪器提取关于第一标准RF发射脉冲串的信息; 使用提取的信息确定RF通信终端的基于幅度的失真; 使用所确定的基于幅度的失真来确定基于幅度的预失真校准信息; 并使用基于振幅的预失真校准信息校准RF通信终端。 通过使用单次发送突发，校准时间可能被最小化。 为了在多个发射频率上校准RF通信终端，可以使用多个单次发射脉冲串，使得每个单次发射脉冲串处于不同的校准频率。
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10.发明授权公开(公告)号：US07412266B2
公开(公告)日：2008-08-12
申请号：US11805073
申请日：2007-05-21
CPC分类号： H04W52/029 , Y02D70/122 , Y02D70/164
摘要： A low frequency timing circuit is used to reestablish a timing signal in a high-frequency timing circuit after the high frequency timing circuit has lost and regained power. The timing of the low frequency circuit is measured against the timing of the high frequency circuit before the high frequency circuit has lost power. The low frequency circuit then is used to measure time after the high frequency circuit has lost power. Once the high frequency circuit has regained power, its timing signal is reestablished at an appropriate time based on a time measurement obtained from the low frequency circuit.
摘要翻译： 低频定时电路用于在高频定时电路丢失并恢复供电之后重新建立高频定时电路中的定时信号。 在高频电路断电之前，针对高频电路的定时测量低频电路的定时。 然后，低频电路用于在高频电路断电后测量时间。 一旦高频电路恢复供电，其定时信号就会根据从低频电路获得的时间测量值在适当的时间重新建立。
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