Method and arrangement for a sigma delta converter for bandpass signals
    2.
    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。

    Method and apparatus for enhancing an operating characteristic of a
radio transmitter
    3.
    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
    4.
    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。

    Amplifier level-setting apparatus
    5.
    发明授权
    Amplifier level-setting apparatus 失效
    放大器电平设定装置

    公开(公告)号:US5239693A

    公开(公告)日:1993-08-24

    申请号:US606679

    申请日:1990-10-31

    IPC分类号: H03F1/30 H04B1/04

    CPC分类号: H03F1/303 H04B2001/0416

    摘要: An amplifier level-setting apparatus is provided for obtaining the maximum power output and highest efficiency allowable for a predetermined level of distortion. According to the invention, a training signal is applied to the input of the amplifier prior to the desired signal. The training signal level is increased while the output distortion is measured. When the output distortion level reaches a predetermined limit, the corresponding training signal input level is saved. The input signal level is then adjusted to this saved level value, thereby resulting in the maximum amplifier output level possible that is still within the distortion limit.

    摘要翻译: 提供放大器电平设定装置,用于获得最大功率输出和最大的可用于预定失真水平的效率。 根据本发明,在所需信号之前将训练信号施加到放大器的输入端。 在测量输出失真时训练信号电平增加。 当输出失真电平达到预定极限时,保存对应的训练信号输入电平。 然后将输入信号电平调整到该保存的电平值,从而导致可能的最大放大器输出电平,仍然在失真极限内。

    Low power digital receiver
    6.
    发明授权
    Low power digital receiver 失效
    低功率数字接收机

    公开(公告)号:US4910752A

    公开(公告)日:1990-03-20

    申请号:US161950

    申请日:1988-02-29

    IPC分类号: H03J5/02 H04B1/16

    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。

    Method and apparatus for a linear transmitter
    7.
    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。