SEMICONDUCTOR INTEGRATED DEVICE, METHOD OF ADJUSTING THE SAME, AND TERMINATION RESISTOR ADJUSTMENT CIRCUIT

• Main Author: NAKATSU ISAO
• Format: Patent
• Language: English
• Published: 18.08.2011
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PULSE TECHNIQUE; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

PROBLEM TO BE SOLVED: To provide a termination resistor adjustment circuit improving the accuracy of a duty ratio between a first transmission line and a second transmission line, and also to provide a semiconductor integrated circuit. SOLUTION: The termination resistor adjustment circuit 71 includes: termination resistor groups 1, 2 which are inserted to the first and second transmission lines 21, 22 of differential input signals respectively, and have resistance values adjusted depending on control signals; a variable resistor group 3 which is inserted to the post-stage of the termination resistor groups 1, 2 at least in one of the first and second transmission lines 21, 22, and adjusts the potential of the transmission line connected through the termination resistor groups 1, 2; a comparator 4 which is inserted to the post-stage of the variable resistor group 3 or to the post-stage of the termination resistor groups 1, 2 when the variable resistor group 3 is not disposed, and compares a potential difference between the first and second transmission lines 21, 22; and a transmission line potential adjustment part 5 which adjusts the potential of the transmission line by controlling the resistance value of the variable resistor group 3 on the basis of a comparison result. COPYRIGHT: (C)2011,JPO&INPIT