N-bit analog-to-digital converter having ratioed reference voltage generation using self-correcting capacitor ratio and voltage coefficient error
US5654713A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1994 |
| Grant date | Aug 5, 1997 |
| Priority date | — |
| Expiry date | Dec 2, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/16
- WIPO fieldControl
- WIPO sectorInstruments
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 a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.