Patent ID: 9354644
Filing Date: 2016-05-31
CPC Classification: G05F,H03F

Claim Text:
1. A temperature drift compensation apparatus comprising: a first variable current source configured to generate a first current proportional to temperature; a second variable current source configured to generate a second current substantially invariable to temperature drift; a first converter configured to receive a first trim code and generate, based on the first trim code, a first converted current from the first current; a second converter configured to receive a second trim code and generate, based on the second trim code, a second converted current from the second current; a controller configured to adjust, at a first temperature and when the first trim code comprises a maximum trim code, the first variable current source until the first converted current is approximately a target value and adjust, at the first temperature and when the second trim code comprises the maximum trim code, the second variable current source until the second converted current is approximately the target value; and a third converter configured to receive a third trim code and generate, based on the third trim code, a third converted current from the second converted current, wherein the controller is further configured to determine, at the first temperature, the third trim code such that the third converted current substantially compensates for an inherent offset of a device, wherein the substantially compensated inherent offset comprises a trimmed offset, wherein the inherent offset of the device, at a second temperature, comprises a second offset, and wherein the controller is further configured to, at the second temperature, determine the first and second trim codes such that the first and second converted currents trim the second offset to substantially the trimmed offset.