| 摘要 |
PROBLEM TO BE SOLVED: To provide a DA converter adaptive to high speed switching operation by widening a minimum pulse width of an outputted PWM signal twofold without changing the number of divisions of the PWM signal. SOLUTION: Inversion means (12, 13) for inverting PWM signals (PWM+, PWM-) outputted from pulse width modulation sections are provided between the two pulse width modulation sections (1, 2) and two switching circuit sections (3, 4). Further, the DA converter is provided with selection means for selecting one of signals (inverse of PWM+, inverse of PWM-) resulting from inverting the PWM signal outputted from the one pulse width modulation section and inverting the PWM signal outputted from the other pulse width modulation section in response to a level of a double clock signal (CLK2) whose period is twice the period of a clock signal (CLK1). The PWM signal given to each switching circuit section is switched for each period of the clock signal. COPYRIGHT: (C)2005,JPO&NCIPI
|
