Patent ID: 7519113
Filing Date: 2009-04-14
Classification: G01R,H03L

Abstract:
1. An electronic device having a noise detection function, comprising: a plurality of the noise detection devices; and a position detection device, each of said plurality of noise detection devices comprising: measuring means for measuring a jitter amount from the output signal of said PLL; and judging means for judging a degree of a risk of a malfunction caused by noise interference based on an output of said measuring means, said position detecting device detecting a position in which noise is detected based on an output of said judging means in each of the plurality of noise detection devices, wherein a plurality of the noise detection devices having different noise sensitivity levels are provided; and a noise detection device of high noise sensitivity is placed in a part of a printed circuit board that is susceptible to noise and a noise detection device of low noise sensitivity is placed in a part of the printed circuit board that is resistant to noise so that noise which occurs in the printed circuit board is detected.