Selective call receiver having an apparatus for modifying an analog signal to a digital signal and method therefor
US6275540A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1997 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Oct 1, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/456
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A selective call receiver (500) includes a radio receiver (501) and a processor (508). The radio receiver includes an antenna (502), a combination circuit (204), a bandpass filter (208), mixers (212, 214), analog-to-digital converters (222, 224), digital mixers (234, 236), a second combination circuit (242), and a digital-to-analog converter (246). The combination circuit receives an analog signal from the antenna and combines the same with an analog feedback signal generated by the digital-to-analog converter. The bandpass filter filters the output of the combination circuit and supplies its output to the mixers which down-convert the signal to baseband signals. These signals are modified by the analog-to-digital converters to digital signals which are up-converted by the digital mixers. The outputs of the digital mixers are combined by the second combination circuit to a digital output that is modified by the digital-to-analog converter to the analog feedback signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.