Ratiometric ADC with pulse width modulated output for wide tempe

Details Ratiometric ADC with pulse width modulated output for wide tempe Ratiometric ADC with pulse width modulated output for wide tempe

1992-02-03

1993-07-20

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341167, 341128, 341155, H03M 150, H03M 112

Patent

active

052297721

ABSTRACT:
An analog-to-digital converter (ADC) includes a capacitor array coupled to switches, an integrator stage connected to the switchable capacitors and a comparator stage connected to the output of the integrator stage. Means coupled to the comparator stage include a feedback loop to effectuate switching reference signals of opposite polarity for use during respective phases of operation of the ADC. The values of the capacitors can be programmed by the user of the ADC and switched to provide a desired total capacitance. For any fixed ratio of the input voltage to reference voltage, the duty cycle remains constant over a wide range of temperatures. Multiple stages afford large effective capacitor ratios with a small range of actual capacitance values and enable a reduction in silicon chip area for an ADC integrated circuit.

REFERENCES:
patent: 3449741 (1969-06-01), Egerton, Jr.
patent: 3462759 (1969-08-01), Hoffman
patent: 4268820 (1981-05-01), Hareyama
patent: 4529965 (1985-07-01), Lee
patent: 4562424 (1985-12-01), Takagi et al.
patent: 4567465 (1986-01-01), Komiya
patent: 4584566 (1986-04-01), Arcara
patent: 4608553 (1986-08-01), Ormond
patent: 4999634 (1991-03-01), Brazdrum et al.

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