H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/88
H03M 1/00 (2006.01)
Patent
CA 1108298
D. C. STABILIZED ANALOG-TO- DIGITAL CONVERTER ABSTRACT OF THE DISCLOSURE A D.C.stabilized analog-to-digital converter of the type having a coarse converter responsive to a supplied analog signal for converting the analog signal to a coarse digital signal representation thereof, a reconverter for reconverting the coarse digital signal representation to a coarse analog signal and for determining the difference between the coarse analog signal and the supplied analog signal, and a fine con- verter responsive to the determined difference for converting said difference to a fine digital representation of the supplied analog signal. A reference signal is periodically supplied to the coarse converter such that this supplied reference signal is converted to a coarse digital signal representation thereof, the coarse digital signal representation of the reference signal is reconverted to a coarse analog reference signal and the differ- ence between this coarse analog reference signal and the period- ically supplied reference signal is determined. A detector is operative during the period that the reference signal is supplied to the coarse converter for detecting a D.C. drift in the opera- tion of the reconverter. A uniform D.C. compensating signal is produced in accordance with the detected D.C. drift and is applied to the reconverter so as to compensate for such D.C. drift. -i-
286818
Gowling Lafleur Henderson Llp
Sony Corporation
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