Flash analog to digital (A/D) converter with reduced number of c

Details Flash analog to digital (A/D) converter with reduced number of c Flash analog to digital (A/D) converter with reduced number of c

1997-03-17

1998-10-06

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

H03M 136

Patent

active

058183795

ABSTRACT:
An N-bit flash A/D converter with a reduced number of comparators is disclosed. The A/D converter includes a reference voltage generator which includes 2.sup.N serially connected resistors, connected between a first supply voltage and a second supply voltage. The reference voltage generator provides a reference voltage at each junction between two resistors. The A/D converter further includes a comparing portion which includes first through mth comparators, where m is equal to 2.sup.(N-1) -1, for comparing every other reference voltage output from the reference voltage generator to an analog signal. An address generator generates a 2.sup.(N-1) bit address responsive to the output of each of the comparators. An upper digital word generator generates N-1 upper bits of a digital word in response to the address. The lower digital word generator selects one of the remaining reference voltages responsive to the address, compares the selected reference voltage with the analog signal, and generates the least significant bit of the digital word. The latch portion latches N-1 upper bits and the least significant bit of the digital word.

REFERENCES:
patent: 4617549 (1986-10-01), Reiner
patent: 5635937 (1997-06-01), Lim et al.

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