Title: Logic level switch circuit and phase synchronous circuit using same
Application Number: 200610072347 Application Date: 2006.04.14
Publication Number: 1848682 Publication Date: 2006.10.18
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03K5/003,H03K5/08,H03L7/08
Applicant(s) Name: Renesas Tech Corp. Address:
Inventor(s) Name: Kawamoto Takaji, Kokubo Masaru
Attorney & Agent: ji xianggang
Abstract:
     A logical level converter generates an output signal by which succeeding logical circuit accurately operates even if there is a threshold fluctuation factor. In the logical level converter, an output signal of a voltage control oscillator in a phase locked loop is inputted to a threshold variable inverter. A DC component of another output signal from the threshold variable inverter is inputted to a comparator, and compared with a comparison voltage. A threshold setting signal is outputted on the basis of a comparison result. The threshold value of the threshold variable inverter is changed according to the threshold variable signal, and the output signal is converted into the other output signal. When the comparison result comes to a given state, the value of the threshold setting signal is held, and the other output signal is outputted as a further different output signal.
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