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1.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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2.发明授权Method and apparatus for enhancing an operating characteristic of a radio transmitter 失效用于增强无线电发射机的操作特性的方法和装置
公开(公告)号：US5564086A
公开(公告)日：1996-10-08
申请号：US158551
申请日：1993-11-29
IPC分类号： H04B1/04
CPC分类号： H04B1/0458
摘要： In a radio transmitter (100) that includes a power amplifier (104) and an antenna (106), a method for enhancing an operating characteristic of the radio transmitter (100) can be accomplished in the following manner. The power amplifier (104) provides a signal (113) to a variable matching network (111), wherein the signal (113) comprises energy to be radiated by the antenna (106). The variable matching network (111) couples the signal (113) to a sampler (112) that is operably coupled to an output of the variable matching network (111 ) and the antenna (106). The sampler (112) samples a forward component (114) and a reflected component (115) of the signal (113). The radio transmitter (100) processes the sampled forward and reflected components (116, 118) to produce a feedback control signal (120). The feedback control signal (120) is used to adjust the variable matching network (111 ), such that an operating characteristic of the radio transmitter (100) is enhanced.
摘要翻译： 在包括功率放大器（104）和天线（106）的无线电发射机（100）中，可以以下列方式实现增强无线电发射机（100）的工作特性的方法。 功率放大器（104）向可变匹配网络（111）提供信号（113），其中信号（113）包括由天线（106）辐射的能量。 可变匹配网络（111）将信号（113）耦合到可操作地耦合到可变匹配网络（111）和天线（106）的输出的采样器（112）。 采样器（112）对信号（113）的正向分量（114）和反射分量（115）进行采样。 无线电发射机（100）处理采样的正向和反射分量（116,118）以产生反馈控制信号（120）。 反馈控制信号（120）用于调整可变匹配网络（111），使得无线电发射机（100）的工作特性得到增强。
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公开(公告)号：US4811362A
公开(公告)日：1989-03-07
申请号：US62816
申请日：1987-06-15
CPC分类号： H03J5/0281 , H04W52/029 , 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：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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5.发明授权
公开(公告)号：US4542352A
公开(公告)日：1985-09-17
申请号：US505568
申请日：1983-06-17
CPC分类号： H03B9/141 , H03C3/22 , H03B2200/007
摘要： A modulated elongate cavity oscillator with minimized modulation nonlinearities includes a first cavity having dimensions which determine the fundamental resonant frequency of the oscillator, a gain element disposed in said first cavity that provides amplification to sustain oscillation, and a varactor diode disposed in said first cavity for modulating the fundamental frequency. A first waveguide is coupled to the first cavity for absorbing modes higher than the mode of the fundamental frequency which have an electric field maxima concurrent with the longitudinal center line of the first cavity. A second waveguide is coupled to the first cavity for absorbing modes higher than the mode of fundamental frequency which have an electric field minima concurrent with the longitudinal center line of the first cavity, whereby the first and second waveguides provide effective attenuation of higher order modes such that modulation nonlinearities due to the existence of higher order modes are substantially eliminated.
摘要翻译： 具有最小调制非线性的调制细长腔振荡器包括具有确定振荡器的基本共振频率的尺寸的第一空腔，设置在所述第一腔中的增益元件，其提供放大以维持振荡，以及设置在所述第一腔中的变容二极管， 调制基频。 第一波导耦合到第一腔，用于吸收比基频的模式高的模式，其具有与第一腔的纵向中心线同时最大的电场。 第二波导耦合到第一腔，用于吸收高于基频模式的模式，其具有与第一腔的纵向中心线同时最小的电场，由此第一和第二波导提供有效衰减高阶模， 基本上消除了由于高阶模式的存在引起的调制非线性。
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公开(公告)号：US4618836A
公开(公告)日：1986-10-21
申请号：US685662
申请日：1984-12-24
CPC分类号： H03B5/1876 , H03B2200/0024 , H03B2201/017 , H03B5/1852
摘要： A improved microwave dielectric oscillator module which is provided with a removable temperature compensated dielectric resonator channel element is described. The removable temperature compensated dielectric resonator channel element cooperates with an electrically shielded housing. A substrate is mounted within the housing. Microstrip or stripline conductive patterns deposited on the substrate couple energy from the removable dielectric resonator to the remainder of the oscillator circuitry. The oscillator achieves wideband operation utilizing a GaAs FET transistor as the oscillators active element in conjunction with an intergral trombone-line phase adjuster.
摘要翻译： 描述了一种改进的微波介质振荡器模块，其具有可拆卸的温度补偿介质谐振器通道元件。 可移除温度补偿介质谐振器通道元件与电屏蔽壳体协作。 衬底安装在壳体内。 沉积在衬底上的微带或带状导电图案将可移除介质谐振器的能量耦合到振荡器电路的其余部分。 振荡器使用GaAs FET晶体管作为振荡器有源元件与整体长号线相位调节器结合实现宽带操作。
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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：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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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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