Abstract: A voltage regulator includes an error amplifier which controls the gate of an output transistor so that a feedback voltage based on an output voltage of an output terminal matches a first reference voltage, a first transistor having a gate to which a second reference voltage is supplied, and a first resistor connected between the gate of the output transistor and the source of the first transistor. The first resistor functions as a resistance constituting a phase compensation circuit by a current flowing therethrough in response to a small output current of the output transistor.

Abstract: This invention involves a bandgap reference circuit in IC. The temperature coefficient of conventional bandgap reference is large and the higher order compensation is difficult to implement. This invention provides an adaptive compensated bandgap reference which solves the problem only using lower order (first order) temperature coefficient compensation. The invention adopts segmental compensation circuit to realize adaptive segmental compensation of bandgap reference with low temperature coefficient. The technical solution includes traditional bandgap voltage reference circuit and adaptive feedback compensation circuit which consists of sample and hold circuit, voltage comparator and control module. This invention controls the bandgap voltage reference through systematical view and it has high process compatibility.

Abstract: An LCD driving circuit comprising an over-voltage protection circuit includes an input terminal to receive an input voltage, a voltage-dividing circuit, a voltage-stabilizing circuit including a voltage-stabilizing element, a control circuit, a switching element, and an output terminal. The voltage-dividing circuit provides a reference voltage according to the input voltage to the voltage-stabilizing circuit, the voltage-stabilizing circuit determines whether the voltage-stabilizing element conducts according to the reference voltage, and the control circuit controls the switching element to switch on or off according to a working stage of the voltage-stabilizing element to determine whether the output terminal outputs an output voltage.