Patent ID: 6738001
Filing Date: 2004-05-18
Classification: H03M

Abstract:
A semiconductor integrated circuit comprising:a digital-to-analogue converter for converting a digital signal into an analogue signal to output an analogue current signal; a current-to-voltage converter for converting said analogue current signal output by said digital-to-analogue converter, into an analogue voltage signal whose level has been controlled; and a filter for filtering said analogue voltage signal converted by said current-to-voltage converter, said current-to-voltage converter comprising: an input terminal for inputting an input current that is in inverse proportion to a resistance variation factor; a current source for supplying a bias current that is in inverse proportion to the same resistance variation factor as said resistance variation factor; a first resistance connected between said current source and said input terminal for said bias current flowing, said first resistance being in proportion to the same resistance variation factor as said resistance variation factor; a second resistance connected between said input terminal and a reference level terminal for said input current and said bias current flowing, said second resistance being in proportion to the same resistance variation factor as said resistance variation factor; and an output terminal connected between said current source and said first resistance for outputting a voltage signal independent of said resistance variation factor.