Patent ID: 7286074
Filing Date: 2007-10-23
Classification: H03M

Abstract:
1. A semiconductor integrated circuit having a built-in ΣΔ A/D conversion circuit including two integrators each having a differential amplifier, a local A/D converter and two local D/A converters, said semiconductor integrated circuit further comprising: a common first reference voltage generator for generating a first reference voltage which is supplied to two local D/A converters; and a common second reference voltage generator for generating a second reference voltage which is supplied to said two local D/A converters, wherein a capacitance element for stabilizing the generated reference voltages is coupled between the output terminal of said first reference voltage generator and that of said second reference voltage generator, and a reference voltage generator for generating a first reference voltage and another reference voltage generator for generating a second reference voltage which is supplied to said local A/D converter are provided as separate circuits from said first and second reference voltage generators.