Analog-to-digital converter

Details Analog-to-digital converter Analog-to-digital converter

1975-10-23

1978-03-28

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1320

Patent

active

040818004

ABSTRACT:
Disclosed is an analog-to-digital converter comprising an analog switch for selecting one of analog input voltage, and first and second different reference potentials; an integrator including at least one integration resistor to which is applied the output of said analog switch, a D.C. amplifier having an inversion input terminal to which is applied the output of said analog switch through said integration resistor and a non-inversion input terminal to which is applied a potential equal to an intermediate value between said first and second reference potentials, and an integration capacitor connected between the output terminal of said D.C. amplifier and said inversion input terminal; an analog comparator having one input terminal connected to the output terminal of the D.C. amplifier and the other input terminal to which is applied a third reference potential; and a control circuit for controlling the change-over operation of said analog switch in response to the output of said analog comparator, wherein said control circuit is designed to make control so that the first reference potential is first integrated by the integrator for a specified length of time T.sub.1 and then the second reference potential is integrated and a length of time T.sub. 2 from the start of this integration until the third reference potential is crossed by the output of the integrator is measured and a length of time T.sub.3 is determined by correcting the T.sub.1 in accordance with the measurement results and the analog input voltage is integrated for the length of time T.sub.3 and thereafter the second reference voltage is integrated and a length of time T.sub.4 from the start of this integration until the third reference potential is crossed by the integrator output is measured, thereby to obtain a digital output corresponding to the analog input voltage from the lengths of time T.sub.3 and T.sub.4.

REFERENCES:
patent: 3735394 (1973-05-01), Eto
patent: 3750146 (1973-07-01), Lucas
patent: 3818246 (1974-06-01), Heilwarth
patent: 3826983 (1974-07-01), Garratt
patent: 3828347 (1974-08-01), Sacks
patent: 3833902 (1974-09-01), Eto
patent: 3842416 (1974-10-01), Eto
patent: 3872466 (1975-03-01), Wold
patent: 3906486 (1975-09-01), Phillips
patent: 3942173 (1976-03-01), Wold

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