The circuit for reducing the effects caused by drift or offset voltage detected by a resolver comprises an oscillator (10), a divider (20) for counting and dividing the output of the oscillator, a buffer (30) for buffering and driving the output of the divider, the first and second ROMs (40,50) for storing the fixed sine and cosine data corresponding to the exciting signal of the resolver, the first and second converters (60,70) for converting the output of the ROMs to analog exciting signal, and the first and second amplifiers (80,90) for amplifying the output of the converters to excite the resolver.
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