Patent ID: 6313662
Filing Date: 2001-11-06
Classification: H03K,H04L

Abstract:
A driver circuit to transmit a signal by switching the direction of a signal current which flows on a pair of transmission lines, said driver circuit comprising:a pair of PMOS transistors as current switching elements on a high-potential side;a pair of NMOS transistors as current switching elements on a low-potential side; anda control signal generator to generate a positive phase control signal to drive a first PMOS transistor of said PMOS transistor pair and a first NMOS transistor of said NMOS transistor pair and to input the positive phase control signal to gates of each of said first transistors, and to generate a negative phase control signal which drives a second PMOS transistor of said PMOS transistor pair and a second NMOS transistor of said NMOS transistor pair and to input the negative phase control signal to gates of each of said second transistors,wherein a drain of said first PMOS transistor is connected to a drain of said first NMOS transistor, and one of said transmission lines is connected to a portion at which said drains are connected to each other,wherein a drain of said second PMOS transistor is connected to a drain of said second NMOS transistor, and the other of said transmission lines is connected to a portion at which said drains are connected to each other, andwherein said control signal generator includes a first differential amplifier to which differential signals are input as input signals, and which outputs first differential signals to drive said PMOS transistor pair, and a second differential amplifier to which the differential signals are input and which outputs second differential signals to drive said NMOS transistor pair and outputs said positive phase control signal and said negative phase control signal from said first and second differential amplifiers.