Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1994-06-06
1996-10-08
Gaffin, Jeffrey A.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341143, 341126, H03M 302, G06G 7186
Patent
active
055635970
ABSTRACT:
A switched-capacitor DAC system includes an integrator circuit including an op amp having an input lead, an output lead and an integrator capacitor connected between the input lead and the output lead. A sampling switch is operable to connect an input capacitor to be charged by an input voltage during at least one of first and second non-overlapping time intervals, wherein the first time interval is subdivided into first and second non-overlapping sub-intervals and the second time interval is subdivided into third and fourth non-overlapping sub-intervals. A transferring switch is operable to connect the input capacitor to transfer charge from the input capacitor to transfer charge from the input capacitor to the integrator capacitor during at least one of the first and third sub-intervals. A discharging switch is operable to connect the input capacitor to a discharge node during at least one of the second and fourth sub-intervals. In a preferred embodiment of the present invention, the sampling switch connects the input capacitor during one of the first and second sub-intervals, the transferring switch connects the input capacitor during one of the first and third sub-intervals, and the discharging switch connects the input capacitor during one of the second and fourth sub-intervals.
REFERENCES:
patent: 4653017 (1987-03-01), Colbeck
Ribner, D. B. et al., "A third-order multistage sigma-delta modulator with reduced sensitivity to nonidealities", IEEE of Solid-State Circuits, 26(12):1764-1773 (Dec. 1991).
Comino, V. et al., "A first-order current-steering sigma-delta modulator", IEEE Journal of Solid-State Circuits, 26(3):176-182, (Mar. 1991).
Analog Devices Inc.
Gaffin Jeffrey A.
Jean-Pierre Peguy
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