Frequency modulation radio transmission device
US5790942A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | May 30, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/40
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A first phase-locked loop (PLL) includes a first integrated voltage-controlled oscillator (VCO) whose output signal has a frequency modulated by an input signal of the device about a multiple of a reference frequency. A second PLL includes a second integrated VCO and frequency transposition means. The transposition circuit receive the output signal of the second VCO and a transposition signal having a non-modulated frequency. The second PLL addresses to the second VCO a control signal capable of aligning the frequency of the output signal of the transposition circuit with the frequency of the first VCO. The output signal of the second VCO forms the frequency modulation transmission signal produced by the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.