A substrate potential generating circuit capable of suppressing variations in the output voltage with respect to variations in external power supply voltage or environmental temperature

摘要

In order to stably supply a substrate potential without being influenced by a power supply voltage or an external environment temperature, a substrate potential is applied to a substrate potential The generating circuit includes a first substrate potential level detection circuit and an oscillation circuit and a charge pump circuit. The first substrate level detection circuit outputs a first control signal according to a comparison result between the substrate potential and the first predetermined potential, The potential level detection circuit includes a first output node for outputting a first control signal, a first input node for coupling with a substrate potential, at least one pair of MOSFETs constituting a current mirror circuit, and a first constant current And a first MOSFET of a first conductivity type connected to the first output node and having a gate coupled to a reference potential and a source connected to the first input node It was configured.;With the above configuration, stable substrate potential control can be performed without being substantially affected by variations in external operating conditions.