Analog to digital converter with conversion rate inverse to the

Details Analog to digital converter with conversion rate inverse to the Analog to digital converter with conversion rate inverse to the

1992-07-27

1993-11-16

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, H03M 150

Patent

active

052627802

ABSTRACT:
The present invention provides an analog to digital converter including an integrator for charging and discharging a capacitor according to two currents of opposite direction containing a component of the analog input signal which is continuously connected. Also, a control circuit periodically switches on one current which remains until the integrator output reaches a reference level at which time the opposite direction current is switched on. A number of such cycles forms an integration period closely approximating a predetermined period. The control circuit measures the total amount of time of the integration period and also the accumulative amount of time that current flow is in a predetermined direction. From these two times, a digital representation of the analog input signal is calculated. The next integration period begins at the end of the previous to achieve a maximum conversion rate for a given integration period.

REFERENCES:
patent: 4620178 (1986-10-01), Naito
patent: 5014058 (1991-05-01), Horn

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