High gain amplifier for reception of low level pulse code modulation nonreturn-to-zero signals
US5146476A · kind A · utility
6Cited by
4References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1990 |
| Grant date | Sep 8, 1992 |
| Priority date | — |
| Expiry date | Dec 3, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/10
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An amplifier for use with low level pulse code modulation (PCM) nonreturn-to-zero (NRZ) signals. The amplifier has a high, but controllable gain and does not have a DC shift at its output as long as there is at least one zero or one one bit in each of frame PCM NRZ signals. The amplifier includes a feedback circuit to control the bias of one of the two stages of amplification when zeroes are being received. The amplifier also includes an AGC circuit which reduces the gain when a high amplitude one is received.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.