公开(公告)号：US20090072905A1

公开(公告)日：2009-03-19

申请号：US12210670

申请日：2008-09-15

申请人： Hoang Duong Quoc ,  Eung Ju Kim ,  Sang Gug Lee ,  Jeong Seon Lee ,  Bong Rak Choi ,  Hong Bong Kim

发明人： Hoang Duong Quoc ,  Eung Ju Kim ,  Sang Gug Lee ,  Jeong Seon Lee ,  Bong Rak Choi ,  Hong Bong Kim

IPC分类号： H03F3/45

CPC分类号： H03G7/06 ,  H03G1/0029

摘要： There is provided a variable gain amplifier that is implemented with a CMOS device and has wide band variation and wide bandwidth by a predetermined exponential function. A variable gain amplifier having wide gain variation and wide bandwidth according to an aspect of the invention may include: a differential amplification section differentially amplifying an input signal according to a gain adjustment signal; and a gain adjustment section supplying the gain adjustment signal on the basis of an approximated exponential function determined according to a predetermined bias current, and adjusting a gain of the differential amplification section.

摘要翻译： 提供了一种用CMOS器件实现的可变增益放大器，并且通过预定的指数函数具有宽带变化和宽带宽。 根据本发明的一个方面，具有宽增益变化和宽带宽的可变增益放大器可以包括：差分放大部分，根据增益调整信号对输入信号进行差分放大; 以及增益调整部，其基于根据预定偏置电流确定的近似指数函数提供增益调整信号，并且调整差分放大部分的增益。

公开(公告)号：US08300744B2

公开(公告)日：2012-10-30

申请号：US12695860

申请日：2010-01-28

申请人： Sun a Kim ,  Dae-Young Yoon ,  Sang-Gug Lee ,  Hyung-Chul Park ,  Jeong-seon Lee

发明人： Sun a Kim ,  Dae-Young Yoon ,  Sang-Gug Lee ,  Hyung-Chul Park ,  Jeong-seon Lee

IPC分类号： H03D1/04

CPC分类号： H04L27/3863 ,  H03D3/009 ,  H03D7/166 ,  H03D7/18 ,  H04B1/30

摘要： The present invention relates to an apparatus for rejecting images in a receiver.The apparatus of the present invention relates to an apparatus for rejecting image signals in a receiver of a direct conversion structure and comprises a signal mismatch compensation unit configured to detect gain error and phase error between an In-phase (I) signal and a Quadrature (Q) signal received through the receiver, to reject image signals existing in the I and Q signals, and to output a result. The signal mismatch compensation unit detects the gain error and the phase error using an adaptive step method of reducing the step size of the gain error and the phase error step by step whenever the gain error and the phase error are converged.According to the present invention, high image rejection ratio is achieved and the adaptation time taken to obtain a high image rejection ratio is reduced simultaneously. Further, a bad influence of the DC offset on the image rejection ratio can be prevented by removing DC offset signals in a digital structure, accordingly, error can be accurately estimated.

摘要翻译： 本发明涉及一种用于拒绝接收机中的图像的装置。 本发明的装置涉及一种用于拒绝直接转换结构的接收机中的图像信号的装置，并且包括：信号失配补偿单元，被配置为检测同相（I）信号和正交（I）信号之间的增益误差和相位误差， Q）信号，以消除存在于I和Q信号中的图像信号，并输出结果。 信号失配补偿单元使用自适应步长法，在增益误差和相位误差收敛的情况下逐步减小增益误差的步长和相位误差来检测增益误差和相位误差。 根据本发明，实现了高的图像抑制比，同时降低了获得高的图像抑制比所需的适应时间。 此外，通过去除数字结构中的DC偏移信号，可以防止DC偏移对图像抑制比的不良影响，因此可以准确地估计误差。