| 摘要 |
A modulation circuit of a D/A converter comprises a pulse number modulation circuit for modulating some bits of digital data and for dispersing a pulse or pulses in one or more resultant pulses, a pulse width modulation circuit for modulating the remain bits of the digital data and for dividing pulses in a resultant pulse train and a combination circuit for combining and positioning at least one pulse in the pulse train adjacent the pulse or pulses in the one or more resultant pulses formed by the pulse number modulation circuit.
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