Method and apparatus for control of an analog to digital converter
    1.
    发明授权
    Method and apparatus for control of an analog to digital converter 失效
    用于控制模数转换器的方法和装置

    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。

    Method and apparatus for a linear transmitter
    4.
    发明授权
    Method and apparatus for a linear transmitter 失效
    线性变送器的方法和装置

    公开(公告)号:US5564087A

    公开(公告)日:1996-10-08

    申请号:US333693

    申请日:1994-11-03

    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。

    Method and arrangement for a sigma delta converter for bandpass signals
    5.
    发明授权
    Method and arrangement for a sigma delta converter for bandpass signals 失效
    用于带通信号的Σ-Δ转换器的方法和装置

    公开(公告)号:US4857928A

    公开(公告)日:1989-08-15

    申请号:US149350

    申请日:1988-01-28

    IPC分类号: H03M3/04 H04B14/06

    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。

    Dual open and closed loop linear transmitter
    6.
    发明授权
    Dual open and closed loop linear transmitter 有权
    双开和闭环线性变送器

    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

    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。

    Integrated multi-mode bandpass sigma-delta receiver subsystem with
interference mitigation and method of using the same
    7.
    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

    IPC分类号: H04B1/00 H04B1/28 H04L27/08

    CPC分类号: H04B1/005 H04B1/00 H04B1/28

    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。

    Method and apparatus for enhancing an operating characteristic of a
radio transmitter
    9.
    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。

    Low power digital receiver
    10.
    发明授权
    Low power digital receiver 失效
    低功率数字接收机

    公开(公告)号:US4811362A

    公开(公告)日:1989-03-07

    申请号:US62816

    申请日:1987-06-15

    IPC分类号: H03J5/02 H04B1/16 H04L27/06

    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。