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Full-Text Articles in Engineering
A Comparison Of N-Path And Digital Filters For Band Pass Applications, Stephen Cooperman
A Comparison Of N-Path And Digital Filters For Band Pass Applications, Stephen Cooperman
Retrospective Theses and Dissertations
The classic problem of achieving high Q, band pass, inductorless filters has been traditionally attacked by applying active RC networks. This approach suffers from the faults of poor economy, lack of stability of performance with time and temperature, and high network performance sensitivity to component changes. The problem is reviewed from the aspect of applying techniques other than operational amplifier RC filters. The techniques presented are those of N-Path (switching) and Digital Filters. The underlying theory of both methods is explored and a design example for each of the techniques is presented. These designs are then compared on the basis …
A High Speed Pulse Code Laser Diode Modulator, John Lawrence Mcdonough
A High Speed Pulse Code Laser Diode Modulator, John Lawrence Mcdonough
Retrospective Theses and Dissertations
This research report reviews the basics of pulse code modulation (PCM) techniques and includes a special encoder design for a system which uses a laser diode output for the transmitted pulse. The text discusses PCM and its features, PCM formats, synchronization, and various accepted PCM codes. The encode circuit design is complete with a description of the circuit, circuit components, and operation. Included are the necessary diagrams, figures, specifications, and parts list. The transmitted output of the design circuit has a repetition rate of one megabit per second.