公开(公告)号：WO03094344B1

公开(公告)日：2004-05-27

申请号：PCT/US0313493

申请日：2003-04-29

Applicant: ATHEROS COMM INC

Inventor： JEN HUNG-MIN ,  SU DAVID K

IPC: H03F3/45 ,  H03G1/00 ,  H03G3/28

CPC classification number: H03F3/45475 ,  H03F1/3211 ,  H03F3/211 ,  H03F3/45183 ,  H03F3/45632 ,  H03F3/72 ,  H03F2203/21175 ,  H03F2203/45138 ,  H03F2203/45318 ,  H03F2203/45332 ,  H03F2203/45458 ,  H03F2203/45464 ,  H03F2203/45512 ,  H03F2203/45702 ,  H03F2203/45704 ,  H03F2203/7221 ,  H03F2203/7236 ,  H03G1/0029

Abstract: The present invention provides a variable gain amplifier with a plurality of gain stages in which each of the gain stages is implemented using a circuit that implements a neutralization approach. This variable gain amplifier provides stable operation characteristics as different gain stages within the variable gain amplifier are turned on and off. This variable gain amplifier also increases linearity across the entire operating range. Additionally, the variable gain amplifier of the present invention provides a constant input impedance through different gain settings. Further, the present invention provides a variable gain amplifier in which each of the various gain stages therein maximize the available voltage swing. Finally, this variable gain amplifier improves common-mode rejection performance and attenuates unwanted harmonics.

Abstract translation: 本发明提供一种具有多个增益级的可变增益放大器，其中使用实现中和方式的电路来实现每个增益级。 该可变增益放大器提供稳定的操作特性，因为可变增益放大器内的不同增益级被打开和关闭。 该可变增益放大器还可以在整个工作范围内提高线性度。 此外，本发明的可变增益放大器通过不同的增益设置提供恒定的输入阻抗。 此外，本发明提供了一种可变增益放大器，其中各种增益级中的每个增益级中的可用电压摆幅​​最大化。 最后，该可变增益放大器提高了共模抑制性能，并衰减了不需要的谐波。