| 摘要 |
A mixed-signal integrated circuit device (100) such as a digital-to-analog converter comprises signal processing circuitry (120-170) operable to produce an output signal (OUT) in dependence upon a received input signal (D1-Dm). Production of the output signal (OUT) is initiated at a time determined by a timing signal (CLK) and is completed at a time which is delayed by a delay time with respect to said timing signal (CLK). The signal processing circuitry (120-170) comprises at least one delay-contributing portion (120, 130, 150, 160) which makes a contribution to the delay time that is affected by variations in a power supply voltage (VDD) applied to the delay-contributing portion concerned. The integrated circuit device (100) is provided with at least one internal supply voltage regulator (110) for connection when the device is in use to a power source external of the device (100) to receive therefrom an external power source voltage (VDD). The supply voltage regulator (110) derives a regulated internal power supply voltage (VDD(REG)) from the external power source voltage (VDD), and this regulated internal power supply voltage (VDD(REG)) is applied to one of the delay-contributing portions (130, 150, 160). At least one further circuitry portion (140, 170) within the integrated circuit device (100) is powered by a supply voltage (VDD) other than the regulated internal power supply voltage (VDD(REG)).
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