Analog to digital converter with double folding interpolation ci

Details Analog to digital converter with double folding interpolation ci Analog to digital converter with double folding interpolation ci

1990-11-06

1992-06-30

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341169, H03M 156

Patent

active

051267420

ABSTRACT:
An analog to digital converter (ADC) is disclosed having a coarse converter to generate the most significant bits of the output and double folding interpolation circuitry to generate the least significant bits. Each side of the double folding circuit includes additional folding stages coupled to reference voltages above and below the full scale input range of the ADC to cancel offset errors and improve circuit linearity. The interpolation circuit includes one interpolation stage, having two multiplier networks, for each least significant bit. Each interpolation stage receives two pairs of signals from the preceding stage and outputs two pairs of signals to the next stage. One of the pairs of output signals from each interpolation stage is also sent to a latched comparator. The outputs of all of the latched comparators can be read directly as the ADC output bits without requiring a decoder.

REFERENCES:
patent: 4325054 (1982-04-01), van de Plassche
patent: 4456904 (1984-06-01), van de Grift et al.
patent: 4611196 (1986-09-01), Fernandez
patent: 4897656 (1990-01-01), van de Plassche et al.
patent: 4912469 (1990-03-01), Van De Grift et al.
patent: 4985701 (1991-01-01), Motoe et al.
Fiedler et al., "A High-Speed 8 Bit A/D Converter Based on a Gray-Code Multiple Folding Circuit (IEEE Journal of Solid-State Circuits", vol. SC-14, No. 3., Jun., 1979, pp. 547-551).
van de Plassche et al., "A High-Speed 7 Bit A/D Converter" (IEEE Journal of Solid-State Circuits, vol. SC-14, No. 6, Dec. 1979, pp. 938-943).
van de Grift et al., "An 8-Bit Video A/D Converter" (IEEE Journal of Solid-State Circuits, vol. SC-19, No. 3, Jun. 1984, pp. 374-378).
van de Grift, et al., "An 8-bit Video ADC Incorporating Folding and Interpolation Techniques" (IEEE Journal of Solid-State Circuits, vol. SC-22, No. 6, Dec. 1987, pp. 944-953).
van de Plassche, et al., "An 8-Bit 100 -MHz Full-Nyquist Analog-to-Digital Converter" (IEEE Journal of Solid-State Circuits, vol. 23, No. 6, Dec. 1988, pp. (1134-1344).
Gilbert, "A Precise Four-Quadrant Multiplier with Subnanosecond Response" (IEEE Journal of Solid-State Circuits, vol. SC-3, No. 4, Dec. 1968, pp. 365-373).

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