Folding stage and folding analog-to-digital converter

Details Folding stage and folding analog-to-digital converter Folding stage and folding analog-to-digital converter

1995-07-05

1997-06-17

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

H03M 112

Patent

active

056401639

ABSTRACT:
A folding stage for a folding analog-to-digital converter includes a plurality of consecutive reference terminals providing ascending different reference voltages, a first summing node, a second summing node and a first output node. A plurality of differentially coupled transistor pairs wherein each of the pairs has a first transistor having a main current path and a control electrode which is coupled to an input terminal (IT) for receiving an input voltage to be folded and a second transistor having a main current path and a control electrode which is coupled to a respective one of the consecutive reference terminals. The main current path of the first transistor of the consecutive transistor pairs is coupled alternately to the first summing node and the second summing node, and the main current path of the associated second transistor is coupled alternately to the second summing node and the first summing node. A current-to-voltage converter includes a first resistor connected between the first output node and the first summing node to provide a first output voltage.

REFERENCES:
patent: 4386339 (1983-05-01), Henry et al.
patent: 5376937 (1994-12-01), Colleran et al.
"An 8-bit 100-MHz Full-Nyquist Analog-to-Digital Converter" by Rudy J. Van de Plassche et al, IEEE Journal of Solid-State Circuits, vol. 23, No. 6, Dec. 1988, pp. 1334-1344.
"An 8-bit Video ADC Incorporating Folding and Interpolation Techniques" by Rob E.J. 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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