公开(公告)号：US06239653B1

公开(公告)日：2001-05-29

申请号：US08984107

申请日：1997-12-03

Applicant: Frencesco Rezzi ,  Rinaldo Castello ,  Marco Cazzaniga ,  Ivan Bietti

Inventor： Frencesco Rezzi ,  Rinaldo Castello ,  Marco Cazzaniga ,  Ivan Bietti

IPC: H03K500

CPC classification number: H03H11/0433

Abstract: The invention relates to an elementary biquadratic cell for programmable time-continuous analog filters. The biquadratic cell is coupled between a first voltage reference and a second voltage reference and has at least one pair of input terminals and first and second pairs of output terminals. The cell includes a pair of half-cells, which half-cells are structurally identical with each other. Each half-cell comprises at least a first transistor coupled between the first and the second voltage reference and having a base terminal connected to a respective one of the input terminals. Each half-cell further comprises second and third transistors coupled between the first and second voltage references. The second transistor has a base terminal connected to the first output terminal of the first pair of output terminals and a collector terminal connected to the first output terminal of the second pair of output terminals. The third transistor has a collector terminal connected to the first output terminal of the first pair of output terminals and a base terminal connected to the second output terminal of the second pair of output terminals.

Abstract translation: 本发明涉及用于可编程时间连续模拟滤波器的基本二次电池。 二次电池耦合在第一参考电压和第二参考电压之间，并且具有至少一对输入端和第一和第二对输出端。 细胞包括一对半细胞，半细胞在结构上彼此相同。 每个半电池包括耦合在第一和第二参考电压之间的至少第一晶体管，并且具有连接到相应输入端子的基极端子。 每个半电池还包括耦合在第一和第二电压基准之间的第二和第三晶体管。 第二晶体管具有连接到第一对输出端子的第一输出端子的基极端子和与第二对输出端子的第一输出端子连接的集电极端子。 第三晶体管具有连接到第一对输出端子的第一输出端子的集电极端子和连接到第二对输出端子的第二输出端子的基极端子。