公开(公告)号：US20160014366A1

公开(公告)日：2016-01-14

申请号：US14325744

申请日：2014-07-08

Applicant: Raytheon Company

Inventor： David Chiaverini ,  John L. Vampola ,  Micky Harris

IPC: H04N5/3745 ,  H04N3/14 ,  H04N5/235

CPC classification number: H04N5/378 ,  H03F3/005 ,  H03F3/082 ,  H03F3/087 ,  H03F3/45475 ,  H03F3/68 ,  H03F3/70 ,  H03F2200/129 ,  H03F2200/156 ,  H03F2200/264 ,  H03F2200/297 ,  H03F2200/312 ,  H03F2200/408 ,  H03F2200/45 ,  H03F2203/45512 ,  H03F2203/45514 ,  H03F2203/45534 ,  H03F2203/45536 ,  H03F2203/45631 ,  H03F2203/45634 ,  H03F2203/45641 ,  H03F2203/45726 ,  H03F2203/45728 ,  H03G1/0094 ,  H03G3/008 ,  H03G3/3084

Abstract: A charge transimpedance amplifier (CTIA) input cell includes a high gain capacitor configured to integrate charge arising from photocurrent, a low gain capacitor, and a switching element that can switch the low gain capacitor to be electrically coupled in parallel to the high gain capacitor. In some examples, the switching element is a low gain switch, which can be manually activated to switch in the low gain capacitor. In these examples, the low gain switch can be electrically disposed between the low gain capacitor and a source of the photocurrent. In other examples, the switching element is a low gain transistor, which can be automatically activated to switch in the low gain capacitor when a voltage across the high gain capacitor reaches a specified threshold. In these examples, the low gain capacitor can be electrically disposed between the low gain transistor and the source of the photocurrent.

Abstract translation: 电荷互阻抗放大器（CTIA）输入单元包括高增益电容器，其被配置为将由光电流产生的电荷，低增益电容器和开关元件组合起来，所述开关元件可以将低增益电容器并联电耦合到高增益电容器。 在一些示例中，开关元件是低增益开关，其可以被手动地激活以切换低增益电容器。 在这些示例中，低增益开关可以电气地布置在低增益电容器和光电流源之间。 在其他示例中，开关元件是低增益晶体管，当高增益电容器两端的电压达到指定的阈值时，该增益晶体管可被自动激活以切换低增益电容器。 在这些示例中，低增益电容器可以电气地布置在低增益晶体管和光电流源之间。