Patent ID: 9360511
Filing Date: 2016-06-07
CPC Classification: G01D,G01R,G09G

Claim Text:
1. A circuit comprising: an amplifier having a first input, a second input, and an output, the first input of the amplifier coupled with a voltage reference source; a current source having an input and an output, the input of the current source coupled with the output of the amplifier, the output of the current source coupled with the second input of the amplifier, the current source being voltage controlled; and one or more display units having a first terminal coupled with the second input of the amplifier and with the output of the current source, wherein the current source is configured to provide a current based on a voltage associated with the output of the amplifier, the current increasing until a voltage associated with the first terminal of the one or more display units equals a voltage associated with the voltage reference source, wherein the first terminal of the one or more display units is associated with a movable element, and the voltage reference source is configured to ramp through a voltage range associated with a travel range of the movable element.