Pseudo two-step current-mode analog-to-digital converter

Details Pseudo two-step current-mode analog-to-digital converter Pseudo two-step current-mode analog-to-digital converter

1998-03-13

2000-01-04

Tokar, Michael

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341154, H03M 112, H03M 178

Patent

active

060115025

ABSTRACT:
A pseudo two-step current-mode analog-to-digital converter is disclosed, which carries out fine comparison in current mode such that the analog-to-digital conversion can be executed correctly even when the input signal is very small, and thus conserves chip area for implementing the series-connecting resistors. The analog-to-digital converter according to the present invention comprises: a reference voltage generator disposed between a first voltage (V1) and a second voltage (V2) to provide a plurality of reference voltage nodes; a first comparing device for comparing the analog input voltage with the reference voltages to output a set of rough codes; a first logic device selectively outputting corresponding bit codes as the output of the significant (higher) bits in accordance with the rough codes; a current conversion device for converting the analog input voltage and the voltage level corresponding to the significant bit codes to an analog input current and a significant-bit reference current respectively, and generating a plurality of fine reference currents; a second comparing device for comparing a differential current with the fine reference currents to output a set of fine codes, wherein the differential current is the difference between the analog input current and significant-bit reference current; a second logic device selectively outputting corresponding bit codes as the output of the least (lower) bits in accordance with the rough codes; and a output encoder receiving the significant bit codes and the least bit codes and outputting a set of digital codes after error correcting the significant bit codes.

REFERENCES:
patent: 3597761 (1971-08-01), Fraschilla et al.
patent: 5289191 (1994-02-01), Elms
patent: 5689260 (1997-11-01), Vallancourt
patent: 5889487 (1999-03-01), Burns et al.

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