N-bit analog-to-digital converter having ratioed reference volta

Details N-bit analog-to-digital converter having ratioed reference volta N-bit analog-to-digital converter having ratioed reference volta

1994-12-02

1997-08-05

Nguyen, Matthew V.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

323313, H03M 112, G05F 316

Patent

active

056547137

ABSTRACT:
An n-bit analog-to-digital converter system, where n is a positive integer, includes a ratioed reference voltage generator that uses a reference voltage V.sub.ref. The reference voltage generator includes a voltage selector having a plurality of voltage selector inputs and a plurality of voltage selector outputs for applying a first voltage to a corresponding voltage selector output during a time period .phi..sub.1 and for applying a second voltage to a corresponding voltage selector output during a following time period .phi..sub.2. The voltage applied to one voltage selector output during any time period is not necessarily the same as the voltage applied to another voltage selector output. The reference voltage generator further includes an amplifier having a plurality of inputs and a differential voltage output and a plurality of sets of capacitances. Each set of capacitances couples an associated one of the voltage selector outputs to an associated one of the inputs of the amplifier and has a value such that the electrical combination of the voltages and capacitances provides a voltage level of .+-.V.sub.ref /m, where m is any desired number, at the differential output of the amplifier.

REFERENCES:
patent: 4295089 (1981-10-01), Cooperman
patent: 4999630 (1991-03-01), Masson
patent: 5170266 (1992-12-01), Kim
patent: 5194867 (1993-03-01), Fisher
patent: 5297066 (1994-03-01), Mayes
patent: 5444447 (1995-08-01), Wingender

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