Analog-to-digital converter

Details Analog-to-digital converter Analog-to-digital converter

1989-01-19

1990-02-20

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

307361, H03M 100

Patent

active

049030280

ABSTRACT:
An analog-to-digital converter for converting an analog input voltage signal to a digital output voltage signal of m upper bits and n lower bits which has a plurality of resistors connected in a series circuit to a voltage source for establishing respective reference voltages, an upper bit encoder having a first input receiving the analog input voltage and second inputs connected to the series circuit at respective intervals defining groups of the resistor therebetween for generating the m upper bits and a switch control signal, each of the groups including a plurality of the resistors, a first lower bit encoder having a first input receiving the analog input voltage signal and second inputs for generating the n lower bits, a second lower bit encoder having a first input receiving the analog input voltage signal and second inputs for generating the n lower bits, a switch circuit associated with each of the groups of the resistors and responsive to the switch control signal for selectively connecting each of the second inputs of the first and second lower bit encoders to respective resistors in the associated group of the resistors, and a circuit for alernately combining the m upper bits with the n lower bits generated by the first and second lower bit encoders and for generating the digital output voltage signal.

REFERENCES:
patent: 4214233 (1980-07-01), Shaw et al.
patent: 4218675 (1980-08-01), Shaw et al.
patent: 4533903 (1985-08-01), Yamada et al.
patent: 4568910 (1986-02-01), Sekino et al.
patent: 4599599 (1986-07-01), Sekino et al.

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