Patent ID: 6853253
Filing Date: 2005-02-08
Classification: H03L

Abstract:
1. Load pump polarised between a supply voltage and the ground and including a first current source associated with a mirror current recopying transistor and a second current source associated with a mirror current recopying transistor, said first and second current sources providing a constant reference current, respectively positive and negative over an output voltage range of said load pump ranging from a minimum output voltage up to a maximum output voltage between the ground and the supply voltage said load pump being characterised in that it further includes a first operational amplifier and a second operational amplifier, said first amplifier being activated and then respectively deactivated by a first comparator when the output voltage of said load pump becomes respectively lower and then higher than a predetermined threshold value so as to force said mirror transistor associated with said first current source into a respectively linear and then saturated operating condition, said second amplifier being activated and then deactivated by a second comparator when the output voltage of said load pump becomes lower and then higher than said predetermined threshold value so as to force said mirror transistor associated with said second current source into a linear and then saturated operating condition.