Nearly DC IF phase locked transceiver
US4852123A · kind A · utility
29Cited by
6References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1988 |
| Grant date | Jul 25, 1989 |
| Priority date | — |
| Expiry date | Dec 12, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/165
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A receiver which converts the RF carrier to a very low frequency and incorporates a PLL demodulator which allows the IF to be AC coupled. This PLL demodulator does not include the IF filters. The bandwidth of the PLL demodulator is wide enough to demodulate FM. Also, components of the receiver can be switched to a transmission mode capable of FM or PSK modulation with a simple circuit. Finally, the receiver includes an AM or PSK coherent amplitude detector which is modified into an imageless spectrum analyzer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.