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    • 76. 发明授权
    • System and method for filtering signals in a transceiver
    • 用于对收发器中的信号进行滤波的系统和方法
    • US07003265B2
    • 2006-02-21
    • US10927013
    • 2004-08-27
    • Young-Deuk JeonSeung-Wook LeeJeong-Woo LeeJoonbae ParkKyeongho Lee
    • Young-Deuk JeonSeung-Wook LeeJeong-Woo LeeJoonbae ParkKyeongho Lee
    • H04B1/38
    • H04B1/1027H03H11/1252H03H11/1291H03J1/0008H04B1/44
    • A system and method for filtering signals in a communications system reduces hardware and chip size requirements by selectively connecting a filter along transmitter and receiver paths of a transceiver. In operation, a controller generated signals for connecting the filter along the transmitter path when the transceiver is in transmitter mode and for connecting the filter along the receiver path when the transmitter is in receiver mode. The controller then generates additional signals for setting one or more parameters of the filter based on the path connected, or put differently based on the operational mode of the transceiver. In a variation, the controller sets the parameters of additional elements coupled to the filter as a way of further controlling processing of the transmitter and receiver signals. The system and method are particularly well suited to controlling the filtering of signals at the front-end of the transceiver having a direct-conversion architecture and in general ones performing time-multiplexing applications.
    • 用于对通信系统中的信号进行滤波的系统和方法通过沿收发器的发射机和接收机路径选择性地连接滤波器来降低硬件和芯片尺寸的要求。 在操作中,当收发器处于发射机模式时,控制器产生用于沿着发射机路径连接滤波器的信号,并且当发射机处于接收机模式时,控制器沿着接收机路径连接滤波器。 然后,控制器产生附加信号,用于基于连接的路径设置滤波器的一个或多个参数,或者基于收发器的操作模式进行不同的设置。 在一个变型中,控制器设置耦合到滤波器的附加元件的参数作为进一步控制发射机和接收机信号的处理的一种方式。 该系统和方法特别适用于控制在具有直接转换架构的收发器的前端处的信号的滤波,并且通常执行时间复用应用。
    • 77. 发明授权
    • System and method for suppressing noise in a phase-locked loop circuit
    • 用于抑制锁相环电路中的噪声的系统和方法
    • US06952125B2
    • 2005-10-04
    • US10689986
    • 2003-10-22
    • Youngho AhnEunseok SongYido KooJeong-Woo LeeJoonbae ParkKyeongho Lee
    • Youngho AhnEunseok SongYido KooJeong-Woo LeeJoonbae ParkKyeongho Lee
    • H03L7/197H03L7/06H03L7/08
    • H03L7/1978
    • A system and method for improving the signal-to-noise ratio of a frequency generator suppresses phase noise and noise generated from mismatches in the internal generator circuits. This is accomplished using a modulation scheme which shifts spurious noise signals outside the loop bandwidth of the generator. When shifted in this manner, the noise signals maybe removed entirely or to any desired degree using, for example, a filter located along the signal path of the generator. In one embodiment, a Sigma-Delta modulator controls the value of a pulse-swallow frequency divider situated along a feedback path of a phase-locked loop to achieve a desired level of noise suppression. In another embodiment, a reference signal input into a phase-locked loop is modulated to effect noise suppression. In another embodiment, the foregoing forms of modulation are combined to accomplish the desired frequency shift. Through these modulation techniques, the signal-to-noise ratio of the frequency generator may be substantially improved while simultaneously achieving faster lock times.
    • 用于提高频率发生器的信噪比的系统和方法抑制由内部发生器电路中的失配产生的相位噪声和噪声。 这是使用将发生器的环路带宽之外的杂散噪声信号移位的调制方案来实现的。 当以这种方式移位时,噪声信号可以使用例如沿着发生器的信号路径定位的滤波器被完全去除或达到任何期望的程度。 在一个实施例中,Σ-Δ调制器控制沿着锁相环路的反馈路径设置的脉冲吞咽分频器的值,以实现期望的噪声抑制水平。 在另一个实施例中,输入到锁相环的参考信号被调制以实现噪声抑制。 在另一个实施例中,组合上述形式的调制以实现期望的频移。 通过这些调制技术,可以显着提高频率发生器的信噪比,同时实现更快的锁定时间。
    • 79. 发明授权
    • Automatic gain control method for highly integrated communication receiver
    • 高度集成通信接收机的自动增益控制方法
    • US06498927B2
    • 2002-12-24
    • US09940637
    • 2001-08-29
    • Suwon KangJeong-Woo LeeJoonbae Park
    • Suwon KangJeong-Woo LeeJoonbae Park
    • H04B700
    • H03G3/3068
    • A wireless or wired communication system and method is provided including a transmitter and a receiver. A RF communication system in accordance with the present invention includes an apparatus and gain control method between RF receiver and baseband modem in case of a plurality of gain stages inside a receiver. The gain of each stage can be controlled by an integrated gain controller. The gain controller monitors the signal level of each gain stage to place its gain to optimal value. The gain control apparatus and method can be implemented in a digital AGC system. The gain controller accepts a signal implementing gain control and thus there is no stability issue. When distributed gain stages are present inside a related art receiver and separate gain control loops are used, stability issues can arise. In a preferred embodiment of an apparatus and method, the baseband modem decides the amount of gain control and adjusts the gain of certain gain stages by the proper amount.
    • 提供了包括发射机和接收机的无线或有线通信系统和方法。 根据本发明的RF通信系统在接收机内的多个增益级的情况下包括RF接收机和基带调制解调器之间的装置和增益控制方法。 每个阶段的增益可以由集成增益控制器控制。 增益控制器监视每个增益级的信号电平,将其增益置于最佳值。 增益控制装置和方法可以在数字AGC系统中实现。 增益控制器接受实现增益控制的信号,因此没有稳定性问题。 当分布式增益级存在于相关技术的接收机内并且使用单独的增益控制回路时,可能会出现稳定性问题。 在装置和方法的优选实施例中,基带调制解调器确定增益控制量并且将某些增益级的增益调整适当的量。