Patent ID: 8941369
Filing Date: 2015-01-27
Classification: G05F

Abstract:
1. A trimmable reference voltage circuit, comprising: a first diode connected between a proportional to absolute temperature current source and ground; a first resistance connected between the first diode and the proportional to absolute temperature current source; a first op-amp having a first input connected to a node between the first resistance and the first diode, an output connected to the gate of a first transistor connected between a high voltage level and ground, wherein the first transistor is connected to ground though a second resistance and the second input of the first op-amp is connected to a node between the first transistor and the second resistance; a second diode connected between ground and the high voltage level, wherein the second diode is connected to the voltage level by a first and a second leg, wherein: a second op-amp having an output connected to the gate of the third transistor, a first input connected to a node between the proportional to absolute temperature current source and the first resistance, and a second input connected to a node of the resistive voltage divider, wherein the reference voltage is provided from a node between the third transistor and the resistive voltage divider.