| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an LVDS output circuit in which the temperature characteristics becomes flat for the intermediate voltage (common voltage) and the output amplitude by using one reference voltage source, and the area of an IC chip to be mounted can be prevented from increasing. <P>SOLUTION: A reference voltage for generating an intermediate voltage (common voltage) is extracted from the output of an operational amplifier 5 in a band gap reference circuit 1, and the reference voltage of a constant current circuit for determining the amplitude is extracted from the node 14 (intermediate tap) of resistors R41, R42 used for generating a band gap voltage. An extraction part has temperature characteristics matching with those of a resistor R6 for current detection. Temperature change of the constant current circuit 3 is eliminated as a whole by matching the temperature characteristics of a resistor for detection and the temperature characteristics at the position of the intermediate tap. Consequently, an LVDS output circuit can be driven using the one band gap reference circuit 1. <P>COPYRIGHT: (C)2013,JPO&INPIT |
