| 摘要 |
PROBLEM TO BE SOLVED: To provide a PC card and a corresponding WLAN system having enhanced digital/analog converters for implementing high-speed, high resolution digital/analog conversion. SOLUTION: This invention provides the PC card (302) and its corresponding WLAN system (300) that implement a analog/digital conversion circuit (105) including a storage means (110), such as a read only memory, for storing delta- sigma analog sequence corresponding to all possible values of a digital input (106) coupled to a plurality of one-bit digital/analog converters (120, 122, 124, 126). Each of the one-bit digital/analog converters (120, 122, 124, 126) is clocked by multi-phase clocks, such that each phase applied to each one of the one-bit digital/analog converters (120, 122, 124, 126) is delayed with respect to one another by the oversampling period. A summer is coupled to each one-bit digital/ analog converters (120, 122, 124, 126) for summing each output from each one-bit digital/analog converters (120, 122, 124, 126)s to generate an analog output.
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