Title:
ディジタル・アナログ変換回路
Document Type and Number:
Japanese Patent JP3568938
Kind Code:
B2
Abstract:
Digital-to-analog (DA) conversion circuitry with a simplified testing circuit includes a DA converter to which test data, initially "0", may be applied. The DA converter feeds an analog voltage corresponding to the test data to a voltage holding circuit. Subsequently the test data is incremented to "1" and then converted to a corresponding analog voltage by the DA converter. A comparator compares the analog voltage corresponding to the test data "1" with the previous analog voltage held in the voltage holding circuit and corresponding to the test data "0". When the test data is sequentially incremented by 1 (one) at intervals, the voltage output from the DA converter is higher than the voltage held in the voltage holding circuit while the DA converter operates normally. The function of the DA converter can be easily, rapidly tested by monitoring the output of the comparator.
Inventors:
Shinsuke Onishi
Daisuke Takagi
Daisuke Takagi
Application Number:
JP2002128047A
Publication Date:
September 22, 2004
Filing Date:
April 30, 2002
Export Citation:
Assignee:
Oki Electric Industry Co., Ltd.
International Classes:
H03M1/10; H03M1/66; (IPC1-7): H03M1/10
Domestic Patent References:
| JP2001099900A | ||||
| JP1123530A | ||||
| JP7106966A |
Attorney, Agent or Firm:
Kakimoto Yasunari