A/D conversion apparatus
US6445320B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2000 |
| Grant date | Sep 3, 2002 |
| Priority date | — |
| Expiry date | Jan 27, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/49
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An A/D conversion apparatus is provided, which is capable of securing a wide dynamic range of A/D conversion with a simple construction through suitably switching the input gain of the input analog signal between predetermined levels. An input gain control device controls gain of an input signal based on a control signal. A &Dgr;&Sgr; modulator carries out oversampling of the input signal having the gain thereof controlled by the input gain control device to convert the input signal to data of one bit. A detecting device detects a peak value of the input signal based on the data of one bit. A gain control device generates the control signal based on the peak value detected by the detecting device in a manner such that the input signal having the gain thereof controlled falls within a predetermined range. To effectively reduce noise of the output digital signal while securing a wide dynamic range of A/D conversion, the &Dgr;&Sgr; modulator may also control the gain of the input signal based on the control signal to a predetermined value (1/A) smaller than 1, and the decimation circuit may have a gain of a second predetermined value (A) for compensating for the gain of the input sign…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.