Patent ID: 6600483
Filing Date: 2003-07-29
Classification: G09G,H03F

Abstract:
A driving circuit comprising,a differential amplifying circuit, an output circuit driven by an output signal of the differential amplifying circuit; and a current control circuit for applying a positive feedback in such that an increased current signal of an operating current on a noninverting side or an operating current on an inverting side of the differential amplifying circuit is injected to increase an operating current of the differential amplifying circuit; wherein a negative feedback implemented by a recirculating transistor chain having a recirculating gain of less-than 1 for decreasing the increased current signal thus injected is applied to the aforesaid current control circuit, wherein the aforesaid differential amplifying circuit is provided with a first current mirror circuit for supplying an electric current corresponding to an operating current on the noninverting side to an output section on the inverting side, and a second current mirror circuit for supplying an electric current corresponding to an operating current on the inverting side to an output section on the noninverting side; wherein an increased variation signal of either of the electric current supplied by the first current mirror circuit or the electric current supplied by the second current mirror circuit is injected to the aforesaid current control circuit as the aforesaid increased current signal.