Patent ID: 6943593
Filing Date: 2005-09-13
Classification: G05B

Abstract:
1. Sample-and-hold device for an electrical input voltage signal (V-IN) with a holding condenser ( 1 ), a controllable sampling switch ( 2 ), which is connected between an input fed with the input voltage signal (V-IN) and a connection of the holding condenser ( 1 ), a controllable mirror switch ( 3 ) and a regulating device ( 4 ), which has a controllable output and is equipped in such a way that it identifies the conductance of the mirror switch ( 3 ) and by activating a control input of the mirror switch ( 3 ) regulates it to an ideal value, whereby the control input of the mirror switch ( 3 ) is connected to a control input of the sampling switch ( 2 ), so that the mirror switch ( 3 ) and the sampling switch ( 2 ) are activated in parallel by the regulating device ( 4 ), characterized in that the sample-and-hold device has a switch arrangement ( 7 , 8 ) and a voltage step-up condenser ( 5 ) and the switch arrangement ( 7 , 8 ) is equipped in such a way that by means of the switch arrangement ( 7 , 8 ) the voltage step-up condenser ( 5 ) is fed either with an auxiliary voltage or is connected between the controllable output of the regulating device ( 4 ) and the control inputs of the sampling switch ( 2 ) and the mirror switch ( 3 ).