| 摘要 |
PROBLEM TO BE SOLVED: To reduce an electrode area of a capacitive element in an IC incorporating a sample-hold circuit. SOLUTION: The sample-hold circuit 20 includes: a switch element 21 for sampling an input signal Vin; the capacitive element 22 for holding the sampled input signal with a charging voltage of Vc=Vin-Vce; and a buffer amplifier 23 for applying impedance conversion to the input signal Vin=Vc+Vce held in the capacitive element 22 and providing an output. The one terminal of the capacitive element 22 is connected to a connecting point between the switch element 21 and the buffer amplifier 23, and the other terminal is connected to an intermediate potential Vce. The withstanding voltage of the capacitive element 22 is lower than a difference between a high potential Vdd and a low potential Vss and is equal to a difference between the high potential Vdd and the intermediate potential Vce or over. COPYRIGHT: (C)2006,JPO&NCIPI
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