A/D converter apparatus with frequency conversion function and radio apparatus using the same
US5841388A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1995 |
| Grant date | Nov 24, 1998 |
| Priority date | — |
| Expiry date | Sep 13, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/438
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An A/D converter apparatus comprising a negative feedback loop having a main signal line supplied with an input signal of a predetermined frequency and a feedback signal line passing through a feedback signal, a A/D converter connected to the main signal line for frequency-converting the input signal to a signal having a frequency different from that of the input signal to output a converted signal, a D/A converter connected to the feedback signal line for frequency-converting the feedback signal to a signal having a frequency substantially equal to that of the input signal, and a subtracter for subtracting the feedback signal from the D/A converter from the input signal to supply a subtraction result signal to the A/D converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.