公开(公告)号：WO2010129065A3

公开(公告)日：2011-03-03

申请号：PCT/US2010001363

申请日：2010-05-06

Applicant: MINDSPEED TECH INC ,  SHIVARAM KRISHNA ,  AHMED KASHIF A

Inventor： SHIVARAM KRISHNA ,  AHMED KASHIF A

IPC: H03G3/10 ,  H03F3/68

CPC classification number: H03F3/08 ,  H03F1/083 ,  H03F1/22 ,  H03F3/45098 ,  H03F3/45475 ,  H03F2200/411 ,  H03F2200/453 ,  H03F2203/45522 ,  H03F2203/45528 ,  H03F2203/45618 ,  H03F2203/45702 ,  H03F2203/45728 ,  H03G3/3084

Abstract: Various amplifier configurations having increased bandwidth, linearity, dynamic range, and less distortion are shown and disclosed. To increase bandwidth in a transimpedance amplifier, a replica circuit is created to replicate a degeneration resistance, or the resistance or value that relates to a feedback resistance. From the replica circuit, the replicated values are mirrored and processed to control a FET switch which modifies a degeneration resistance. The FET switch control signal is related to the feedback resistance and modifies the degeneration resistance to thereby maintain the product of the feedback resistance and the degeneration resistance as a constant. In another embodiment, a second switch controlled by an automatic gain control signal is established between a first stage amplifier and a second stage amplifier to improve dynamic range and bandwidth without degrading other amplifier specifications.

Abstract translation: 显示和公开了具有增加的带宽，线性，动态范围和较小失真的各种放大器配置。 为了增加跨阻放大器中的带宽，创建复制电路以复制退化电阻或与反馈电阻相关的电阻或值。 从复制电路中，复制的值被镜像并被处理以控制修改退化电阻的FET开关。 FET开关控制信号与反馈电阻相关，并且改变退化电阻，从而将反馈电阻和退化电阻的乘积保持为常数。 在另一个实施例中，在第一级放大器和第二级放大器之间建立由自动增益控制信号控制的第二开关，以改善动态范围和带宽，而不降低其他放大器规格。

公开(公告)号：WO2009055035A2

公开(公告)日：2009-04-30

申请号：PCT/US2008012122

申请日：2008-10-24

Applicant: MINDSPEED TECH INC ,  ZOU HEHONG ,  SHIVARAM KRISHNA ,  DRAPER DANIEL

Inventor： ZOU HEHONG ,  SHIVARAM KRISHNA ,  DRAPER DANIEL

IPC: H03F3/08 ,  H04B10/06

CPC classification number: H03F3/082

Abstract: The invention relates to amplifiers and in particular, to a transimpedance amplifier for high rate applications. Disclosed is a two stage transimpedance amplifier having a first stage comprising an amplifier and a load and a second stage comprising an amplifier and a resistor. Negative feedback is provided through a feedback resistor. Only two voltage conversions occur which reduces phase distortion, as compared to three stage transimpedance amplifiers which perform 3 voltage conversions.

Abstract translation: 本发明涉及放大器，特别涉及用于高速应用的跨阻放大器。 公开了具有包括放大器和负载的第一级的二级跨阻抗放大器，以及包括放大器和电阻器的第二级。 通过反馈电阻提供负反馈。 与执行3次电压转换的三级跨阻抗放大器相比，仅发生两次电压转换，从而降低相位失真。