Pulse-shaping filter for modulator monolithic integration
US5732106A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1995 |
| Grant date | Mar 24, 1998 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03834
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Disclosed is a digital pulse shaping circuit for reducing undesirable frequency components in subsequent data modulated transmissions, which circuit can be easily manufactured as a monolithic integrated circuit. In a preferred embodiment, the pulse shaping circuit employs an edge detector circuit to detect data transitions of an incoming serial data stream. Upon a data edge detection, the edge detector provides a control signal to a digital counter to enable the counter to begin counting applied clock pulses and generate a linear count. The linear count is provided to a decoding circuit, which generates an output word as a nonlinear function of the value of the count. The decoded output word then drives a digital modulator which modulates an RF carrier to provide wireless data transmission with improved spectral efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.