Analog to digital converter using parallel folder and decoder ci

Details Analog to digital converter using parallel folder and decoder ci Analog to digital converter using parallel folder and decoder ci

1992-11-06

1994-08-23

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341141, H03M 112

Patent

active

053411374

ABSTRACT:
An analog to digital converter includes first and second folder circuits that map an analog input voltage into first and second folder output voltages, using two different voltage transfer functions. First and second flash circuits generate first and second digital representations of the first and second folder output voltages. An MSB conversion circuit generates a set of most significant bits representative of the analog input voltage input, and a multiplexer selects one of the first and second digital representations in accordance with the least significant bit of the output from the MSB conversion circuit. The analog to digital converter further includes first and second decoder circuits for decoding the first and second digital representations from the two flash circuits, and the multiplexer selects one of the two decoded digital values. The selected decoded value represents the least significant bits of a digital representation of the analog input value.

REFERENCES:
patent: 3187325 (1965-06-01), Waldhauer et al.
patent: 4297679 (1981-10-01), Arbel et al.
patent: 4733217 (1988-03-01), Dingwall
patent: 4903028 (1990-02-01), Fukushima et al.
patent: 5099240 (1992-03-01), Nakatani et al.
"A High-Speed 8 Bit A/D Converter Based on a Gray-Code Multiple Folding Circuit"; U. Fiedler et al.; IEEE Journal of Solid-State Circuits, vol. SC-14, No. 3, Jun. 1979; pp. 547-551.
"A Monolithic 8-Bit Video A/D Converter"; R. Van de Grift et al.; IEEE Journal of Solid-State Circuits, vol. SC-19, No. 3, Jun. 1984; pp. 374-378.
"An 8-bit Video ADC Incorporating Folding and Interpolation Techniques"; R. Van de Grift et al.; IEEE Journal of Solid-State Circuits, vol. SC-22, No. 6, Dec. 1987; pp. 944-953.

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