Patent ID: 8994356
Filing Date: 2015-03-31
Classification: G05F

Abstract:
1. A method for adjusting a reference voltage of an electronic circuit, which is provided with a first band-gap stage, wherein the first band-gap stage includes in a series arrangement between two terminals of a supply voltage source, at least one current source, a first configurable resistor and a first diode, the first band-gap stage supplies a band-gap voltage, which is defined by a voltage generated by a current passing through the first configurable resistor and the first diode, the reference voltage being obtained based on the band-gap voltage supplied by the first band-gap stage, the method comprising: measuring a first band-gap voltage with a first resistive value configured by a first binary word at a first temperature selected within an operating temperature range of the electronic circuit, measuring a second band-gap voltage with a second resistive value configured by a second binary word at the first temperature, measuring a third band-gap voltage with the first resistive value configured by the first binary word at a second temperature,. which is different from the first temperature,. and which is within the operating temperature range of the electronic circuit, measuring a fourth band-gap voltage with the second resistive value configured by the second binary word at the second temperature, and determining an appropriate binary word for configuring the first configurable resistor based on the first through fourth measured band-gap voltages, so as to obtain a band-gap voltage that is independent of temperature variation, wherein the appropriate binary word for configuring the first configurable resistor is determined based on the i-bit binary word formula: where V