| 摘要 |
PROBLEM TO BE SOLVED: To provide a voltage addition D/A conversion circuit whose accuracy can be enhanced or whose circuit scale can be decreased. SOLUTION: The voltage addition D/A conversion circuit includes: a plurality of switching elements S<SB>1</SB>to S<SB>N</SB>provided corresponding to bits of a received digital signal and whose connection state is switched to a reference voltage side or a ground side depending on each bit of the digital signal; first resistive elements R10<SB>1</SB>to R10<SB>N-1</SB>; and second resistive elements R20<SB>1</SB>to R20<SB>N</SB>whose resistance is twice the resistance of the first resistive elements, wherein one-side terminals of the second resistive elements are respectively connected to the switching elements, the first resistive element is connected between the other-side ends of the second resistive elements respectively, and a resistance circuit network is provided, which comprises: a series connection of a second resistive element R20<SB>1+N</SB>and a third resistive element R30<SB>1</SB>R30<SB>2</SB>with a desired resistance connected between the other-side end of the second resistive element connected to the switching element provided with the least significant bit and ground; and a second resistive elements R20<SB>N+1</SB>and R20<SB>N+2</SB>and a third resistive element R30<SB>1</SB>and R30<SB>2</SB>with a desired resistance connected between the other-side end of the second resistive element connected to the switching element provided with the most significant bit and least significant bit and ground among the switching elements. COPYRIGHT: (C)2007,JPO&INPIT
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