Oversampling A/D converter comprising an additional capacitor sw

Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion

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Details

341163, 341122, 341155, H03M 150

Patent

active

048765449

ABSTRACT:
Besides an input switched capacitor (14) for sampling an input analog signal into output electric charges, an oversampling analog-to-digital converter comprises an additional switched capacitor (47) for sampling, into additional electric charges in synchronism with the input switched capacitor, controlled electric charges produced by a capacitor array (24) which is coupled to a reference voltage source (23) and is controlled by a predetermined number of control signals produced by a control logic (22) in response to an output digital signal. A summing circuit delivers the output and the additional electric charges to an integrator (15) connected to a quantizer (21) which produces a quantized signal substantially identical with the digital signal. Preferably, the summing circuit comprises a connecting switch (49) for supplying the output and the additional electric charges to the integrator in synchronism with the input and the additional switched capacitors. A switch array (25) is controlled by the control signals to make the capacitor array produce the controlled electric charges.

REFERENCES:
patent: 4684925 (1987-08-01), Maruta
patent: 4736188 (1988-04-01), Jackson

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