Parabolic signal generator

Details Parabolic signal generator Parabolic signal generator

1998-03-20

2000-02-08

Westin, Edward P.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

31536817, 31536818, 315371, G09G 104, H01J 2956, H01J 2958

Patent

active

060231335

ABSTRACT:
A parabolic signal generator (100) for use in a cathode ray tube (CRT) display circuit, comprising: programmable delay means (110) for receiving a CRT horizontal flyback signal and for producing a trigger signal which is delayed relative to the horizontal flyback signal by a programmable predetermined time; ramp generating means (130, 140) coupled to receive the trigger signal from the programmable delay means for producing a symmetric ramp signal in response to the trigger signal; and parabola generating means (150) coupled to receive the ramp signal from the ramp generating means for producing the parabolic signal. Since the trigger signal delay is programmable, it can be adjusted to match the delay of a range of external components. Since the ramp signal is symmetric it does not require the use of complex blanking circuitry to suppress spuriae.

REFERENCES:
patent: 4121164 (1978-10-01), Feucht
patent: 4683405 (1987-07-01), Truskalo et al.
patent: 5283476 (1994-02-01), Wakabayashi
patent: 5502410 (1996-03-01), Dunn et al.
patent: 5656895 (1997-08-01), Tateishi
patent: 5831400 (1998-11-01), Kim

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