| 摘要 |
<p>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 converter 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 difference between this coarse analog reference signal and the periodically 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 operation 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.</p> |
