Method and apparatus for communication and signal synthesis
US6154640A · kind A · utility
34Cited by
21References
37Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1995 |
| Grant date | Nov 28, 2000 |
| Priority date | — |
| Expiry date | Sep 21, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/23
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a receiving and transmitting apparatus, a frequency of a direct digital synthesizer provided in a local oscillating circuit is controlled in order to reduce a frequency error, based on data of a frequency error detecting circuit. The direct digital synthesizer includes a digital operation circuit for inputting data designating the frequency and outputting an amplitude value of a periodic signal synchronous with a reference clock, and digital-analog converter for converting the amplitude value of the periodic signal to an analog signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.