Analog/digital converter
US4584558A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1985 |
| Grant date | Apr 22, 1986 |
| Priority date | — |
| Expiry date | May 14, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An analog/digital converter wherein an analog input signal is applied to a variable gain input amplifier which has an output connected to a subtractor. Also connected to the subtractor is the output of a D/A converter, the input of which is connected to the output of an integrator. The subtractor forms from the output signal of the input amplifier and that of the D/A converter a difference signal which is used by a tracking circuit for generating tracking signals for the integrator. For the purpose of widening the dynamic range, the input amplifier contains four scaling amplifiers, one of which is connected by a selection switch to the output of the input amplifier. The scaling factors of the second, third, and fourth scaling amplifiers are 1/4, 1/16, and 1/64, respectively, of that of the first scaling amplifier. If the output of the integrator exceeds predetermined limits, a control logic circuit sets the selection switch to the scaling amplifier having the next-smaller scaling factor, effects a resetting of the output signal of the integrator which corresponds to a division by four of this signal when it exceeds one of the limits of the output range and indicates the respectivel…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.