CIRCUIT INTEGRATEUR A LINEARITE AMELIOREE

申请公布号：

FR2759509(A1)

申请号：

FR19970001429

申请日期：

1997.02.07

申请公布日期：

1998.08.14

申请人：

THOMSON TUBES ELECTRONIQUES

发明人：

DUCOURANT THIERRY

分类号：

H01L27/146;G06G7/184;G11C27/02;H04N5/335;(IPC1-7):H03H11/00

主分类号：

H01L27/146

摘要：

The invention concerns circuits for integrating light-induced charges, in particular for limiting linearity faults generated by non-linear stray capacitors. The integrating circuit comprises an integrating capacitor (c1) with a first armature (2) connected to a reference voltage (Vr) and a second armature (3) at a point ("A") with variable voltage where it receives light-induced charges, a reset MOS transistor (t1) of a first type (P) connected to point ("A") with variable voltage and to a power supply voltage (V+), said MOS transistor (t1) of a first type representing a stray capacitance (cp1) parallel to the integrating capacitor (c1). The invention is characterised in that it comprises one or several MOS transistors of a second type (t2, t3) connected to the point with variable voltage, each having a stray capacitor parallel to the integration capacitor. A variation at the terminals of the integrating capacitor brings about a variation in the value of the stray capacitors of the second type MOS transistors which tends to compensate the variation of the stray capacitance of the first type MOS transistor. The invention is applicable to the input stages of charge amplifiers.