Two-way code converter专利检索- .可逆模/数转换器专利检索查询-专利查询网

Two-way code converter
申请号	JP16251280	申请日	1980-11-18	公开(公告)号	JPS5787236A	公开(公告)日	1982-05-31
申请人	Fujitsu Ltd;			发明人	KARIBE HIROHISA; MATSUMURA TOSHIHIKO;
摘要	PURPOSE:To reduce the circuit scale, by determining polarity inversion by a sign bit of an input digital signal and information used for a DA converter, in the two-way code converter for AD conversion and DA conversion. CONSTITUTION:An input analogue signal Ain is applied to positive and negative unipolar DACs 11 and 12, and switches 17-22 perform such switching control that the positive unipolar DAC 11 is used as a local decoder for AD conversion when the input analogue signal Ain has a positive polarity and the negative unipolar DAC 12 is used as a local decoder for AD conversion when the input an analogue signal Ain has a negative polarity. The unipolar DAC which is not used as the local decoder in this case is used for DA conversion, and it is determined whether the polarity should be inverted or not in a polarity inverting circuit 14 in the basis of the sign bit of an input digital signal Din and information indicating which DAC of positive and negative unipolar DACs 11 and 12 is used for DA conversion. Consequently, even if unipolar DACs are used, resampling after polarity discrimination is unnecessary, and the holding circuit is omitted.
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