Patent ID: 6246152
Filing Date: 2001-06-12
Classification: G11B,H01L,H03F

Abstract:
A driver circuit for controlling a piezoelectric actuator in a charge mode, the driver circuit comprising:an amplifier having a first input terminal for receiving a control voltage, and a second input terminal, said amplifier comprisinga main final stage having a main output terminal for connecting to the piezoelectric actuator, andan additional final stage having an additional output terminal connected to the second input terminal,the main final stage and the additional final stage being connected in parallel with one another so that a current through the main output terminal is proportional to a current through the additional output terminal in accordance with a predefined factor; anda capacitance device connected to the second input terminal and having a constant capacitance value so that an electrical charge transferred to the piezoelectric actuator is correlated with the control voltage in accordance with the predefined factor and the capacitance value.