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公开(公告)号：US5389927A
公开(公告)日：1995-02-14
申请号：US68324
申请日：1993-05-28
IPC分类号： H03M1/18
CPC分类号： H03M1/182
摘要： An analog signal having an input level is provided. The analog signal is converted into a digitized representation of the analog signal in an analog to digital converter (105) that uses an operating range. The digitized representation of the analog signal is processed (107) to determine the input level for the analog signal. The input level for the analog signal is compared (109) with a reference signal to provide a comparison signal. The comparison signal is manipulated (111) to adjust the operating range.
摘要翻译： 提供具有输入电平的模拟信号。 在使用操作范围的模数转换器（105）中，模拟信号被转换为模拟信号的数字化表示。 处理模拟信号的数字化表示（107）以确定模拟信号的输入电平。 将模拟信号的输入电平与参考信号进行比较（109）以提供比较信号。 操纵比较信号（111）以调整工作范围。
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公开(公告)号：US5564087A
公开(公告)日：1996-10-08
申请号：US333693
申请日：1994-11-03
CPC分类号： H03G3/3042 , H03F1/34 , H03F2200/57 , H04B2001/0433
摘要： A method and apparatus is provided for a transmitter (200) with a stable, linear response. The transmitter (200) includes an amplification stage (242), and a negative feedback correction loop (244) with a feedback signal (252). A reference signal (251) is combined with the feedback signal (252) to produce an error signal (253) for coupling to the amplification stage (242). Transmitter parameters are varied when a difference between the reference signal (251) and the error signal (253) exceeds a particular threshold.
摘要翻译： 为具有稳定的线性响应的发射机（200）提供了一种方法和装置。 发射机（200）包括具有反馈信号（252）的放大级（242）和负反馈校正环（244）。 参考信号（251）与反馈信号（252）组合以产生用于耦合到放大级（242）的误差信号（253）。 当参考信号（251）和误差信号（253）之间的差超过特定阈值时，变送器参数是变化的。
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3.发明授权
公开(公告)号：US4857928A
公开(公告)日：1989-08-15
申请号：US149350
申请日：1988-01-28
CPC分类号： H04B14/062 , H03M3/408 , H03M3/424 , H03M3/438
摘要： An improved apparatus and method for a sigma delta converter for bandpass signals is disclosed, suitable for use in mobile radio applications, between the front end and digital signal processing stages, that includes at least one bandpass filter, an n-level quantizer, an n-level digital-to-analog (D/A) converter, and a direct current (DC) feedback network. The sigma delta converter for bandpass signals may be configured in a second order or a fourth order embodiment and achieves analog-to-digital conversion of a signal having a non-zero frequency carrier or suppressed carrier with improved signal-to-noise ratio performance and with minimal quantization error. As a result, the sigma delta conversion occures earlier in a receiver chain and a dynamic range of about 95-98 dB is achieved.
摘要翻译： 公开了一种用于带通信号的Σ-Δ转换器的改进的装置和方法，适用于前端和数字信号处理级之间的移动无线电应用，其包括至少一个带通滤波器，n级量化器，n 级数字模拟（D / A）转换器和直流（DC）反馈网络。 用于带通信号的Σ-Δ转换器可以被配置在二阶或四阶实施例中，并且实现具有改进的信噪比性能的具有非零频率载波或抑制载波的信号的模数转换， 具有最小的量化误差。 结果，在接收器链中发生了Σ-Δ转换，并且实现了约95-98dB的动态范围。
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公开(公告)号：US5542096A
公开(公告)日：1996-07-30
申请号：US379417
申请日：1995-01-27
CPC分类号： H03F1/3294 , H03F1/3247 , H03F1/345 , H03F2200/57 , H04B2001/0416 , H04B2001/0433
摘要： A transmitter that includes an amplifying element, an antenna, a gain stage, and a closed loop feedback may compensate for varying antenna loads without an isolator. This may be accomplished by determining the effects of the varying loading on overall loop gain. Knowing the effects, the transmitter adjusts the gain of the gain stage to maintain a constant overall loop gain, thus eliminating the need for an isolator.
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公开(公告)号：US5066923A
公开(公告)日：1991-11-19
申请号：US606653
申请日：1990-10-31
CPC分类号： H04L27/368 , H03C3/08 , H03F1/3247 , H03F2200/57 , H04B2001/0433
摘要： A linear transmitter having both an open loop and a closed loop training mode capability functions to schedule and facilitate these training modes in a manner that reduces adjacent channel splatter. A training waveform can be utilized to enhance these operational objectives. Scheduling of the open loop and closed loop training modes can be ordered, in a TDM system, in a variety of ways.
摘要翻译： 具有开环和闭环训练模式能力的线性发射机用于以减少相邻频道飞溅的方式调度和促进这些训练模式。 可以使用训练波形来增强这些操作目标。 可以以多种方式在TDM系统中排序开环和闭环训练模式的调度。
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公开(公告)号：US5675286A
公开(公告)日：1997-10-07
申请号：US599656
申请日：1996-02-12
CPC分类号： H03G3/3047 , H03F1/3247 , H03F1/3282 , H03F1/345 , H03G3/3042
摘要： An amplifier structure (200) includes a main amplifier loop (203) for efficiently amplifying an input signal at a power amplifier (228) coupled to a load susceptible to impedance variations. The amplifier loop (200) further includes an auxiliary loop (201) coupled to the main loop (201) for simultaneously preventing the power amplifier (228) from operating inefficiently or causing off-channel interference.
摘要翻译： 放大器结构（200）包括主放大器环（203），用于有效地放大耦合到容易受阻抗变化的负载的功率放大器（228）的输入信号。 放大器回路（200）还包括耦合到主回路（201）的辅助回路（201），用于同时防止功率放大器（228）低效运行或导致离线通道干扰。
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7.发明授权Method for a transmitter to compensate for varying loading without an isolator 失效发射机的方法，用于补偿没有隔离器的变化负载
公开(公告)号：US5423082A
公开(公告)日：1995-06-06
申请号：US80635
申请日：1993-06-24
CPC分类号： H03F1/3294 , H03F1/3247 , H03F1/345 , H03F2200/57 , H04B2001/0416 , H04B2001/0433
摘要： A transmitter that includes an amplifying element, an antenna, a gain stage, and a closed loop feedback may compensate for varying antenna loads without an isolator. This may be accomplished by determining the effects of the varying loading on overall loop gain. Knowing the effects, the transmitter adjusts the gain of the gain stage to maintain a constant overall loop gain, thus eliminating the need for an isolator.
摘要翻译： 包括放大元件，天线，增益级和闭环反馈的发射机可以在没有隔离器的情况下补偿变化的天线负载。 这可以通过确定变化负载对总体环路增益的影响来实现。 了解效果，发射机调节增益级的增益，以保持恒定的总体环路增益，从而无需隔离器。
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公开(公告)号：US4910752A
公开(公告)日：1990-03-20
申请号：US161950
申请日：1988-02-29
CPC分类号： H04W52/0293 , H03J5/0281 , H04B1/1615 , Y02B60/50
摘要： A low power digital receiver (10) is provided that contemporaneously selects the lowest possible sampling signal frequency (34) (from a plurality of available sampling signals), and received signal level (28) to properly digitize (32) and recover a desired signal. Digitization is performed after the first IF using broadband stages (28, 30, and 32) that are temporarily enabled (44) to rapidly digitize the first IF signal. This, together with the low sampling rate, minimizes the power consumption of the receiver (10) thereby permitting portable and mobile digital receiver embodiments.
摘要翻译： 提供了同时选择最低可能采样信号频率（34）（从多个可用采样信号）和接收信号电平（28）适当数字化（32）并恢复期望信号的低功率数字接收机（10） 。 在第一IF使用临时使能宽带级（28,30和32）（44）以快速数字化第一IF信号之后进行数字化。 这与低采样率一起使接收机（10）的功耗最小化，从而允许便携式和移动数字接收机实施例。
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公开(公告)号：US06606483B1
公开(公告)日：2003-08-12
申请号：US09686732
申请日：2000-10-10
IPC分类号： H04B104
CPC分类号： H03G3/3047 , H03F1/0277 , H03F1/345 , H04B1/0475
摘要： A linear transmitter includes an amplifier feedback loop for amplifying an input signal at a power amplifier. The feedback loop is operated in an open loop mode when the power amplifier is operating at a first operating point and is operated in a closed loop mode when the power amplifier is operating at a second operating point. The transmitter further includes an auxiliary loop coupled to the amplifier feedback loop that provides phase training for the feedback loop and power leveling when the feedback loop is operating open loop. Open loop phase training and power leveling is done during open loop transmission, without an associated training signal or training period. Stable closed loop operation can commence subsequently providing the higher power amplifier efficiency associated with the second operating point and maintaining off channel interference requirements.
摘要翻译： 线性发射器包括用于放大功率放大器处的输入信号的放大器反馈回路。 当功率放大器在第一工作点操作时，当功率放大器在第二工作点运行时，反馈回路以开环模式工作，并且在闭环模式下工作。 发射机还包括耦合到放大器反馈回路的辅助回路，当反馈回路工作在开环状态时，该回路为反馈回路提供相位训练和功率调平。 开环相位训练和功率调平在开环传输期间完成，没有相关的训练信号或训练周期。 随后可以开始稳定的闭环操作，提供与第二工作点相关联的更高的功率放大器效率，并保持关闭信道干扰要求。
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10.发明授权Integrated multi-mode bandpass sigma-delta receiver subsystem with interference mitigation and method of using the same 有权具有干扰抑制的集成多模带通Σ-Δ接收机子系统及其使用方法
公开(公告)号：US6160859A
公开(公告)日：2000-12-12
申请号：US174628
申请日：1998-10-19
申请人： William J. Martin , William J. Turney , Paul H. Gailus , Edward T. Clark , Joshua E. Dorevitch , Terry K. Mansfield
发明人： William J. Martin , William J. Turney , Paul H. Gailus , Edward T. Clark , Joshua E. Dorevitch , Terry K. Mansfield
摘要： An integrated multi-mode bandpass sigma-delta radio frequency receiver subsystem with interference mitigation includes a first intermediate frequency amplifier. At least one mixer for mixing the output of the first amplifier and an oscillator signal. A second IF amplifier for amplifying and filtering the output of the at least one mixer. A multi mode multi bandwidth sigma delta analog digital converter for providing digital output signals with high dynamic range. A digital mixer providing I and Q signals a decimation network providing I and Q signals at reduced programmable data and clock frequencies and a formatting network for arranging the I and Q signals into a predetermined format for use with a digital signal processor.
摘要翻译： 具有干扰抑制的集成多模式带通Σ-Δ射频接收器子系统包括第一中频放大器。 用于混合第一放大器的输出和振荡器信号的至少一个混频器。 用于放大和滤波至少一个混频器的输出的第二IF放大器。 一种多模式多带宽Σ-Δ模拟数字转换器，用于提供高动态范围的数字输出信号。 提供I和Q的数字混合器发信号通过减少的可编程数据和时钟频率提供I和Q信号的抽取网络和用于将I和Q信号布置成用于数字信号处理器的预定格式的格式化网络。
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