| US 7,486,217 B2 | ||
| A/D converter | ||
| Masatoshi Matsushita, Kanagawa (Japan); and Masahiko Sagisaka, Kyoto (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Jun. 13, 2007, as Appl. No. 11/762,197. | ||
| Claims priority of application No. 2006-167771 (JP), filed on Jun. 16, 2006. | ||
| Prior Publication US 2007/0290914 A1, Dec. 20, 2007 | ||
| Int. Cl. H03M 1/14 (2006.01); H03M 3/00 (2006.01) | ||
| U.S. Cl. 341—161 [341/143; 341/155] | 1 Claim |
| 1. An A/D converter, comprising:
an A/D converter for pipeline use, that converts an analogue input signal into a digital signal;
a D/A converter that switches between pipeline use and delta-sigma modulation use according to a mode in use;
an analogue adder that subtracts an output of the D/A converter from the analogue input signal; and
a hybrid stage comprising an analogue operation circuit that receives as input an output of the analogue adder and functions
as an amplifier in a pipeline mode and as an integrator in a delta-sigma mode, wherein the hybrid stage comprises:
an A/D converter for pipeline use, that converts an analogue input signal into a digital signal;
a first D/A converter for pipeline use;
a second D/A converter for delta-sigma modulation use;
an analogue adder that subtracts an output of the first and second D/A converters from the analogue input signal; and
an analogue operation circuit that receives as input an output of the analogue adder and functions as an amplifier in the
pipeline mode and as an integrator in the delta-sigma mode.
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