公开(公告)号：EP1220448B1

公开(公告)日：2004-03-03

申请号：EP01130836.8

申请日：2001-12-27

Applicant: STMicroelectronics S.r.l.

Inventor： Zerilli, Tommaso ,  Gaibotti, Maurizio

IPC: H03K4/502

CPC classification number: H03K4/00 ,  H03K17/163

公开(公告)号：EP1220448A1

公开(公告)日：2002-07-03

申请号：EP01130836.8

申请日：2001-12-27

Applicant: STMicroelectronics S.r.l.

Inventor： Zerilli, Tommaso ,  Gaibotti, Maurizio

IPC: H03K4/502

CPC classification number: H03K4/00 ,  H03K17/163

Abstract: The present invention refers to a generator circuit (3) for voltage ramps having an improved dynamic operation of the type comprising a differential stage (4) of a first output which controls a p-channel transistor (M1). A positive feedback branch is provided between the drain of the p-channel transistor (M1) and a first input of the differential stage and comprises a capacitor (C1). A current generator (G1) provides current to the first input of the differential stage. The drain of the p-channel transistor (M1) is also connected at an output terminal (OUT) of said ramp generator circuit (3) to a capacitative charge (C1) to be biased with voltage ramps.
Advantageously, the ramp generator circuit comprises a second n-channel output transistor (N3) parallel connected to said p-channel transistor (P3) and having the control terminal connected to a second output (X1) of said differential stage (4).

Abstract translation: 本发明涉及一种用于电压斜坡的发生器电路（3），其具有改进的动态操作，其类型包括控制p沟道晶体管（M1）的第一输出的差分级（4）。 在p沟道晶体管（M1）的漏极和差分级的第一输入端之间提供正反馈支路，并且包括电容器（C1）。 电流发生器（G1）向差动级的第一输入提供电流。 p沟道晶体管（M1）的漏极也在所述斜坡发生器电路（3）的输出端（OUT）连接到电容性电荷（C1）以被电压斜坡偏置。 有利地，斜坡发生器电路包括并联连接到所述p沟道晶体管（P3）并使控制端子连接到所述差分级（4）的第二输出（X1）的第二n沟道输出晶体管（N3）。