Integrating type analog-to-digital converter

Details Integrating type analog-to-digital converter Integrating type analog-to-digital converter

1978-09-11

1981-05-19

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, 340347M, 324 99D, H03K 1302

Patent

active

042688205

ABSTRACT:
An analog-to-digital converter of the integrating type is disclosed in which, while an analog input signal is integrated over a first period, a reference signal is selectively superposed on the analog input signal during the first period when the integrated value exceeds a predetermined value, so as to reduce the absolute value of the integrated value of the analog input signal, and then at the termination of the first period the integrated value is inversely integrated by a reference signal (a separate reference signal or the same reference signal as above-mentioned), a period within the first period during which the reference signal is superposed and the second period, i.e., from the beginning of the inverse integration after the first period to the time point that the integrated value reaches the predetermined value being used to produce an output in a digital form. Since the inverse integration is selectively performed in the first period, the absolute value of the integrated value is small at the termination of the first period. As a result, the second period is shortened and the output amplitude of the integrator is reduced.

REFERENCES:
patent: 3745556 (1973-07-01), Dorey
patent: 4164733 (1979-08-01), Landsburg et al.
Landsburg, A Charge Balancing Monolithic A/D Converter, IEEE International Solid State Circuits Conference Digest of Technical Papers, Feb. 17, 1977.
Landsburg, A Charge-Balancing Monolithic A/D Converter, IEEE Journal of Solid State Circuits, vol. SC-12, No. 6, 12/1977, pp. 662-673.

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