| 摘要 |
PURPOSE:To obtain an analog output with a smooth waveform by integrating the difference between data obtained by analog conversion and sample holding and a next analog output, and subtracting this integration output to the output after the sample holding or subtracting it from the next analog output. CONSTITUTION:A signal (a) from a D/A converter 2 is sample and held by a sample holding circuit 3 to obtain a signal (b). This signal (b) and the next signal (a) from the D/A converter 2 are supplied to a subtracter 4, which outputs a signal (c). This signal (c) is supplied to an integrator 5 to obtain the waveform of a signal (d). Then, an adder 6 adds the waveform of the signal (d) to the signal (b) from the sample holding circuit 3 to obtain a smooth output as shown by a signal (e). When this signal (e) is compared with the output signal (b) of the sample holding circuit 3, the signal (e) becomes a smooth signal and has its high frequency component reduced greatly as compared with a stepped signal like the signal (b).
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