Semiconductor integrated circuit

Details Semiconductor integrated circuit Semiconductor integrated circuit

2006-02-14

2006-02-14

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S155000, C341S118000, C331S014000, C331S017000, C345S211000, C375S376000

Reexamination Certificate

active

06999020

ABSTRACT:
A frequency detecting circuit10detects frequency of a sampling pulse SP, and outputs the detected frequency as a detection value VOUT. A current adjusting circuit20adjusts a power supply current Ivd to be supplied to an AD converter30in accordance with the detection value VOUT. The power supply current Ivd varies continuously so as to follow the sampling frequency. As a result, an optimum power supply current Ivd can always be supplied in accordance with the operating frequency of the AD converter30. That is, power consumption of the AD converter30can be reduced. Since the power supply current Ivd can be adjusted in accordance with the sampling frequency, it is possible to form the AD converter30that has a wide frequency band and allows great versatility.

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Gu-Yeon Wei, et al., “A Fully Digital, Energy-Efficient, Adaptive Power-Supply Regulator”, IEEE Journal of Solid-State Circuits, IEEE Inc., New York, vol. 34, No. 4, Apr. 1999, pp. 520-528.

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