Pulse-shaping filter for modulator monolithic integration

Details Pulse-shaping filter for modulator monolithic integration Pulse-shaping filter for modulator monolithic integration

1995-06-05

1998-03-24

Chin, Stephen

Pulse or digital communications

Transmitters

Antinoise or distortion

375306, 327129, H04K 102, H04L 2503, H04L 2544

Patent

active

057321060

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.

REFERENCES:
patent: 3997855 (1976-12-01), Nash
patent: 4596022 (1986-06-01), Stoner
patent: 4748640 (1988-05-01), Staley et al.
patent: 5446760 (1995-08-01), Bienz et al.

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