| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique achieving a low power and a high-speed operation and being capable of inhibiting the fluctuation of input-output characteristics by a power-supply voltage, a temperature change and the dispersion or the like of device characteristics in a level conversion circuit. SOLUTION: The level conversion circuit has a source follower circuit 603 with a transistor NM1 inputting an AC signal at a CML level and the transistor NM2 inputting a control voltage Vc and a control-voltage generating circuit 602 generating the control voltage Vc inputting the transistor NM2. The control-voltage generating circuit 602 has a replica source follower circuit 604 as a replica for the source follower circuit 603 with the transistor NM3 inputting a central voltage at the CML level and the transistor NM4 inputting the control voltage Vc. The control-voltage generating circuit 602 further has a comparator 605 controlling the control voltage Vc so that the output voltage of the replica source follower circuit 604 and a CMOS-circuit threshold voltage Vcmosth are equalized. COPYRIGHT: (C)2008,JPO&INPIT
|
