Noncoherent-coherent A.C. coupled base band AGC receiver
US4901332A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 1988 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Oct 27, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0063
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention describes a phase shift key receiver or demodulator having an A.C. couple base band automatic gain control. A pair of detectors for the automatic gain control are A.C. coupled to the output of a pair of linear analog multipliers for the purpose of eliminating DC offset signals and for minimizing thermal noise at the input of the automatic gain control circuit. The outputs of the pair of detectors connected in the data detecting branch and the carrier tracking branch of the PLL are connected to a input of the summing circuit whose output is connected to the automatic gain control loop filter. The output of the filter supplies the scaling signal employed as the scaling input to the linear analog multipliers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.