A/D conversion with folding and interpolation

Details A/D conversion with folding and interpolation A/D conversion with folding and interpolation

1996-09-04

1998-05-12

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341156, H03M 100

Patent

active

057512361

ABSTRACT:
An A/D converter has an input part IS which provides differential transitions T1 . . . T.sub.x associated with different levels of an analog input signal. An intermediate part IMS of the converter carries out folding operations and interpolation operations on the transitions to thereby obtain a set of bit-determining signals XO . . . XQ. At least one of the folding and interpolation operations is carried out more than once in alternation with the other of such operations. An output part OS produces a digital output signal from the bit-determining signals. Such an A/D converter can be implemented in a cost-efficient manner and may be combined with digital signal processing circuitry. The repetition of at least one of the operations alternately with the other permits the interpolation factor to be increased without necessitating increased complexity of the output part, and the folding factor to be increased without adversely affecting the accuracy of the converter.

REFERENCES:
patent: 4831379 (1989-05-01), van de Plassche
patent: 5126742 (1992-06-01), Schmidt et al.
patent: 5633638 (1997-05-01), Venes et al.
patent: 5640163 (1997-06-01), Navta et al.
Van de Plassche et al "An 3 Bit 100MHZ Full Nyquist A/D Converter" Dec. 1988, pp. 1334-1344, IEEE Journal vol. SC-23 No. 6.
Van de Grift et al "An 8-bit Video ADC . . . Folding & Interpolation Techiques", Dec. 1987, pp. 944-953, IEEE Journal vol. 22 #6.

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