Jitter-free sweep generator for a cathode ray oscilloscope

Details Jitter-free sweep generator for a cathode ray oscilloscope Jitter-free sweep generator for a cathode ray oscilloscope

1985-08-06

1987-03-17

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315410, H01J 2970

Patent

active

046510656

ABSTRACT:
A sweep generator for the delivery of a sweep signal to a deflection system (typically horizontal) of a cathode ray tube, including a sawtooth generator for generating a sawtooth waveform containing a ramp which determines the duration of each sweep. A frequency divider such as a D flip flop is connected to a trigger circuit for generating, when enabled by a holdoff signal, output pulses whose recurrence rate is a submultiple of that of the incoming trigger pulses. Also when enabled by the holdoff signal, a sweep gating flip flop responds to the first output pulse from the frequency divider for causing the sawtooth generator to generate the sweep ramp. Thus, since the sweep gating flip flop does not directly responds to the trigger pulses, but to the output pulses of the frequency divider, no jitter is to take place if the holdoff signal acquires a prescribed state for sweep initiation concurrently with a trigger pulse. An additional embodiment is disclosed which includes a pseudotrigger pulse generator for affording a higher sweep frequency when the trigger frequency is low.

REFERENCES:
patent: 3659115 (1972-04-01), Montgomery
patent: 3706904 (1972-12-01), Mordan
patent: 3836851 (1974-09-01), Schumann
patent: 4007400 (1977-02-01), Sutton
patent: 4109182 (1978-08-01), Dalton
patent: 4251754 (1981-02-01), Navarro et al.
patent: 4529916 (1985-07-01), Nozawa
patent: 4555765 (1985-11-01), Crooke et al.

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