Patent ID: 8854090
Filing Date: 2014-10-07
Classification: H03K

Abstract:
1. A driver circuit, comprising: a first output part in which plural first conductive transistors are connected in parallel, and an output impedance is controlled in accordance with first control information; a second output part in which plural second conductive transistors are connected in parallel, and an output impedance is controlled in accordance with second control information; a gate control part which drives the plural first conductive transistors held by the first output part and the plural second conductive transistors held by the second output part; and a current source circuit which generates a signal controlling driving ability of the gate control part, wherein the current source circuit includes: plural first conductive transistors corresponding to the plural first conductive transistors held by the first output part and ON/OFF controlled based on the first control information; a first resistor in which drains of the plural first conductive transistors are commonly connected to one end thereof; and a signal generation part which receives a current flowing at the plural first conductive transistors and the first resistor as an input current, and generates a signal controlling the driving ability of the gate control part based on the input current.