Voltage generator |
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| 申请号 | JP17509782 | 申请日 | 1982-10-04 | 公开(公告)号 | JPS5963577A | 公开(公告)日 | 1984-04-11 |
| 申请人 | Advantest Corp; | 发明人 | YAMAGUCHI HIDEHIKO; | ||||
| 摘要 | PURPOSE:To remove an offset voltage, and to reduce the number of D-A converters to only one set for every voltage generating circuit, and to reduce the cost by varying an offset bias which is in a digital signal state. CONSTITUTION:A data converter 201 which performs addition and subtraction according to polarity data is provided, and a digital signal corresponding to the most significant digit bit value of set data 102 is applied as the offset bias by this data setter 201; set voltage data is added on the positive polarity side based upon the bias or subtracted on the negative polarity side, thus performing data conversion. The adding operation and subtracting operation of this data converter 201 are switched according to the polarity data stored in a polarity data register 107 and the arithmetic result is supplied to a D-A converter 202; the converter 202 has a normal output terminal 202a and a complement output terminal 202b, and a current-voltage converter 104 is connected to the normal output terminal 202a to obtain a plus analog voltage. Further, the current-voltage converter 104' consisting of a resistor 203 is connected to the complement output terminal 202b to obtain an analog voltage in negative polarity. | ||||||
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