| US 7,541,954 B2 | ||
| Touch control apparatus and analog-to-digital converting apparatus and method thereof | ||
| Shawn Min, Tainan Hsien (Taiwan) | ||
| Assigned to Realtek Semiconductor Corp., Hsinchu (Taiwan) | ||
| Filed on Nov. 28, 2007, as Appl. No. 11/998,094. | ||
| Claims priority of application No. 95144379 A (TW), filed on Nov. 30, 2006. | ||
| Prior Publication US 2008/0129571 A1, Jun. 05, 2008 | ||
| Int. Cl. H03M 1/22 (2006.01) | ||
| U.S. Cl. 341—122 [341/118; 341/120; 341/155] | 20 Claims |
| 11. A touch control apparatus comprising:
a divided voltage source for generating a divided voltage according to a power voltage and a ground voltage; and
an analog-to-digital converting apparatus including:
a first sample-and-hold circuit coupled to said divided voltage source and operable to sample and hold the divided voltage;
a second sample-and-hold circuit for sampling and holding the power voltage; and
an analog-to-digital converter coupled to said first and second sample-and-hold circuits, said analog-to-digital converter
converting the divided voltage from said first sample-and-hold circuit to a digital value according to the power voltage held
by said second sample-and-hold circuit and the ground voltage;
wherein said first and second sample-and-hold circuits sample the divided voltage and the power voltage before said analog-to-digital
converter converts the divided voltage, and hold the sampled divided voltage and the sampled power voltage at least during
conversion of the divided voltage by said analog-to-digital converter.
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