Source impedance matching in an analog-to-digital converter

Details Source impedance matching in an analog-to-digital converter Source impedance matching in an analog-to-digital converter

1998-06-26

2000-09-05

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, 341118, 341120, H03M 136

Patent

active

061149829

ABSTRACT:
An analog-to-digital (A/D) converter for converting an analog signal into a digital signal includes a first resistor ladder coupled between a first reference voltage and a second reference voltage. The A/D converter also includes a second resistor ladder that matches the first resistor ladder and that has a first end and a second end coupled to an analog signal source. The first resistor ladder and the second resistor ladder are coupled to at least two comparators with each comparator having a reference input and an analog input. The impedance at each reference input due to the first resistor ladder matches the impedance at each corresponding analog input due to the second resistor ladder.

REFERENCES:
patent: 5231399 (1993-07-01), Gorman et al.
patent: 5731776 (1998-03-01), Kumamoto et al.
patent: 5815106 (1998-09-01), Poss et al.
patent: 5877718 (1999-03-01), Andoh et al.
patent: 5990707 (1999-11-01), Goldenberg et al.

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