Band gap reference circuit and method for operating a band gap reference circuit

摘要

A band gap reference circuit comprises a first and a second branch (B1, B2) with a pair of matched transistors (T1, T2) and a pair of mismatched diode elements (D1, D2). A reference resistive element (RPTAT) is connected in series to one of the diode elements (D2). Resistive elements (R1, R2) are connected in parallel, respectively, to the pair of diode elements (D1, D2). A control amplifier (OP) comprised by the circuit is coupled to the first and the second branch (B1, B2) on its input side and commonly coupled to respective control terminals of the pair of matched transistors (T1, T2) and an output transistor (T3) on its output side. A comparator device (CMP) is configured to provide a startup signal (STS) depending on a voltage drop across the reference resistive element (RPTAT). A switchable startup current device (ST1) is configured to provide a startup current to the other one of the diode elements (D1) depending on the startup signal (STS).