Bandgap reference circuit and method for room temperature trimming with replica elements

A method for trimming a bandgap reference circuit, wherein for providing the bandgap reference circuit the method comprises the steps of:

• arranging a first diode in series with a first resistor between a reference point and a reference potential;
• arranging a second diode in series with a second resistor and a third resistor between the reference point and the reference potential;
• arranging a trimming network in series with a current source between the reference point and a supply voltage;
• wherein the trimming network exhibits an adjustable resistance;
• wherein a bandgap reference voltage is provided at a midpoint between the trimming network and the current source;
• and
• coupling a first input of an operational amplifier to a midpoint between the first diode and the first resistor, wherein a second input of the operational amplifier is coupled to a midpoint between the second resistor and the third resistor, and wherein an output of the operational amplifier is used to control the current source;
• wherein the method further comprises the steps of:
• measuring a first diode voltage across a replica element of the first diode;
• the replica element of the first diode being a copy of the first diode;
• determining a first resistance of a replica element of the first resistor;
• the replica element of the first resistor being a copy of the first resistor;
• and
• setting the resistance of the adjustable resistance of the trimming network using the first diode voltage and the first resistance.