Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2008-06-24
2008-06-24
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S156000
Reexamination Certificate
active
07391353
ABSTRACT:
An A-D converter utilizing V-F conversion is realized that is capable of performing A-D conversion with high precision without increasing conversion frequency. Two VCOs are provided to find a V-F conversion value that is less than a period of the main VCO by making use of a period difference between the two VCOs. By counting the number of pulses in a pulse signal that is output from a BASE-VCO with a counter, a high order bit of a digital signal is generated. A low order bit, on the other hand, is generated by calculating, for each sampling period, a phase difference from the beginning of a sampling period until a first pulse generation in the sampling period for the output of the BASE-VCO by a third register and second and third subtracters, based on the number of pulses in the output of the BASE-VCO contained in a period from a current activation time point of sampling signal Ps to a time point at which phases of outputs of the BASE-VCO and JAW-VCO match.
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Fuetrek Co., Ltd.
Jean-Pierre Peguy
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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