Patent ID: 6118681
Filing Date: 2000-09-12
Classification: G01R

Abstract:
A gradient amplifier for a magnetic resonance tomography apparatus, comprising:an output stage adapted for connection to a load, said load having a load parameter associated therewith;a reference value source which emits a signal representing a reference value for said load parameter;an actual value unit which determines an existing, actual value of said load parameter and which generates a signal representing said actual value;a control unit supplied with said signal representing said reference value and said signal representing said actual value, said control unit determining a setting value dependent on a relationship between said reference value and said actual value;a modulator connected to said control unit and supplied with said setting value, said modulator generating an output stage drive signal dependent on said setting value;said output stage being connected to said modulator and receiving said output stage drive signal therefrom and generating an output signal for supply to said load dependent on said output stage drive signal;said reference value source generating said signal representing said reference value with a precision that is higher by at least a factor of 10 than a precision of at least one of said setting value, said output stage drive signal and said output signal; andsaid actual value unit generating said signal representing said actual value with a precision that is higher by at least a factor of 10 than a precision of at least one of said setting value, said output stage drive signal and said output signal.