| 摘要 |
PURPOSE:To easily secure noise margin with respect to a power voltage by combining a D/A converter and a transformer so as to obtain a high voltage D/A circuit with high digital resolution. CONSTITUTION:The titled circuit consists of an AC power supply 11, (l)-set of transformers 121-123 whose winding ratio is respectively n1, n2,...n1, a rectifier/smoothing circuit 13, a D/A converter (l)14, a D/A converter (2)15 and a D/A converter (l)16. Since outputs of the D/A converters with a digital data set thereto are processed as AC by an AC power supply 11, the signal is transformed in response to the transformer winding ratio n1, n2,...nl at the transformers 121-123 and outputted as the summed AC power at the secondary winding of the transformers 121-123. The AC power outputted from the secondary winding of the transformers 121-123 is inputted to the rectifier/smoothing circuit 13, where the power is transformed into a DC power corresponding to the set digital data. Thus, noise margin with respect to the DC power voltage is ensured.
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