Driver Circuit for Analyzing and Controlling a Piezoelectric Component, Button Providing Haptic Feedback, and Operating Method

A driver circuit comprising:

• a signal port with a first terminal and a second terminal;
• a first node and a second node;
• a comparator with an inverting input, a non-inverting input and an output;
• and
• an operational amplifier with an inverting input, a non-inverting input and an output, wherein the first terminal is electrically conductively connected with the inverting input of the operational amplifier,
• wherein the second terminal is electrically conductively connected with the non-inverting input of the comparator,
• wherein the inverting input of the comparator is electrically conductively connected with the output of the operational amplifier,
• wherein the first node is electrically conductively connected with the output of the operational amplifier,
• wherein the inverting input of the comparator is electrically conductively connected with the inverting input of the operational amplifier, and
• wherein the second node is electrically conductively connected with the non-inverting input of the operational amplifier.

A button with haptic feedback comprising:

• a piezoelectric device;
• and
• a driver circuit,
• wherein the driver circuit is configured to:
• register a change in voltage induced by the piezoelectric device;
• and
• apply a voltage to the piezoelectric device on pressing and/or release of the button.