Method and device for generating an adjustable bandgap reference voltage

摘要

According to an embodiment, generating an adjustable bandgap reference voltage includes generating a current proportional to absolute temperature (PTAT). Generating the PTAT current includes equalizing voltages across the terminals of a core that is designed to be traversed by the PTAT current. Generating the adjustable bandgap reference also includes generating a current inversely proportional to absolute temperature (CTAT), summing the PTAT and the CTAT currents and generating the bandgap reference voltage based on the sum of the currents. Equalizing includes connecting-across the terminals of the core a first fed-back amplifier with at least one first stage arranged as a folded setup and including first PMOS transistors arranged according to a common-gate setup. Equalizing also includes biasing the first stage based on the CTAT current. The summation of the PTAT and CTAT currents is performed in the feedback stage of the first amplifier.

主权项

1. A circuit comprising:
a core comprising a first terminal and a second terminal and configured to generate a current proportional to absolute temperature when voltages across the first and second terminals of the core are equalized; a first amplifier comprising a first stage that includes a first PMOS transistor coupled to the first terminal and a second PMOS transistor coupled to the second terminal; a follower amplifier coupled to a terminal of the core and configured to generate a current inversely proportional to absolute temperature; a feedback stage comprising a first transistor coupled to the first terminal and having a first input gate and a second transistor coupled to the second terminal and having a second input gate, wherein an output of the first stage of the first amplifier is coupled to the first and second input gates; and an output module configured to generate a reference signal based on a reference current proportional to a sum of the current proportional to absolute temperature and the current inversely proportional to absolute temperature.