Waveform generator

Details Waveform generator Waveform generator

1992-07-02

1994-02-01

Sikes, William L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307228, 328185, H03K 412

Patent

active

052834760

ABSTRACT:
This invention relates to a waveform generator used in a CRT display unit or the like, and to an apparatus for generating intended saw-tooth waveforms and parabolic waveforms under control of a microcomputer. The microcomputer produces a charging control signal having a prescribed pulse frequency and duty-cycle for forming a rising period in one cycle of the output waveform and supplies the signal to terminal a. Then, a capacitor is charged through a transistor and charging resistor. The microcomputer produces a discharging control signal having a prescribed pulse frequency and duty-cycle for forming a falling period in a cycle of the output waveform and supplies the signal to terminal b. Then, the capacitor is discharged through a transistor and discharging resistor. The output waveform voltage is produced across the capacitor.

REFERENCES:
patent: 3839679 (1974-10-01), Hughes
patent: 4225825 (1980-09-01), Watts
patent: 4322636 (1982-03-01), Shroeder
patent: 4654542 (1987-03-01), Baird et al.
patent: 5134308 (1992-07-01), Boemi

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