Driver circuits, systems for driving actuators, and imaging systems with actuators. The driver circuit includes a current comparator circuit, a driver, and a replica circuit. The current comparator circuit includes a first node having a first voltage. The current comparator circuit also includes a second node having a second voltage. The driver includes a first terminal responsive to the second voltage. The driver also includes a second terminal connected to a reference voltage. The replica circuit includes a third terminal connected to the first node. The replica circuit also includes a fourth terminal connected to the second terminal of the driver. The replica circuit also includes a fifth terminal connected to the first terminal of the driver.