Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2009-03-05
2010-10-12
Williams, Howard (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S172000
Reexamination Certificate
active
07812756
ABSTRACT:
In each of a plurality of stages, an input analog signal is quantized, so that a digital signal corresponding to each part of bits is generated. ADA conversion portion generates an analog reference signal based on the digital signal, and a remainder operation portion performs addition/subtraction and amplification by a predetermined factor with respect to the input analog signal. Then, the signal thus obtained is supplied to a subsequent stage. The DA conversion portion in the first stage where A/D conversion of a plurality of bits is performed includes primary voltage supply portions capable of outputting a reference voltage at one of a plurality of levels, and an auxiliary voltage supply portion capable of outputting a reference voltage at an auxiliary level different from the above-described level. The respective voltage supply portions selectively output the reference voltages based on a digital signal generated by an AD conversion portion. Based on a combination of the output reference voltages, the analog reference signal in accordance with the digital signal is generated. It is possible to reduce power consumption while suppressing an increase in the area of an element.
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Kito Takayasu
Ogita Shinichi
Hamre Schumann Mueller & Larson P.C.
Panasonic Corporation
Williams Howard
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