Patent ID: 7843236

Claim:
A low voltage differential signal receiver comprising: an input stage circuit converting a low voltage differential signal into a first current signal and a second current signal, wherein said low voltage differential signal comprises a first input voltage signal and a second input voltage signal; a current source circuit coupled to said input stage circuit and generating a set of operating currents required by said input stage circuit according to a plurality of bias signals; a current mirror circuit coupled to said current source circuit and said input stage circuit, receiving said first current signal and said second current signal to generate an output voltage signal, and generating said bias signals to said current source circuit according to said first current signal and said second current signal, and a fail-safe circuit coupled to said current mirror circuit, wherein when an absolute value of difference of said first input voltage signal and said second input voltage signal is greater than a predetermined value, said fail-safe circuit switches said output voltage signal from an original first predetermined voltage value to a second predetermined voltage value; and when the absolute value of difference of said first input voltage signal and said second input voltage signal is less than said predetermined value, said fail-safe circuit maintains said output voltage signal at said first predetermined voltage value.