Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1988-04-20
1989-10-24
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307246, 307228, 307234, 328 58, 358153, 358158, 358148, H03K 504, H03K 1756, H03K 408, H04N 508
Patent
active
048764639
ABSTRACT:
A pulse generator of controllable duty cycle for horizontal synchronization signals in a television receiver is provided. The pulse generator broadly comprises a duty cycle control loop with a comparator means having an output coupled to the output of the pulse generator, a duty cycle detector means coupled to the comparator means for detecting the duty cycle of the output of the comparator means, a duty cycle control means for setting the duty cycle of the output of the comparator means to a desired value, and an error feedback means coupled to the duty cycle control means, the duty cycle detector means, and the comparator means. Duty cycle control is achieved either by a control pulse or by means of a voltage divider which is coupled between a supply voltage and ground, with a voltage divider node connected to the base of the error feedback transistor. The comparator means, the duty cycle of which is the duty cycle of the pulse generator, is turned on by means of the voltage at its base dropping 0.7 V below the voltage at its emitter. The rate of change of the base voltage is in turn controlled by an RC time constant and the error feedback means. The comparator means is turned off by means of an edge trigger means which receives the horizontal synchronization signal as an input.
REFERENCES:
patent: 3714470 (1973-01-01), Goldberg
patent: 4277697 (1981-07-01), Hall et al.
patent: 4330751 (1982-05-01), Swain
patent: 4621240 (1986-11-01), Alvord et al.
patent: 4672448 (1987-06-01), Gioiosa
patent: 4682226 (1987-07-01), Kadlec
Miller Stanley D.
North American Philips Corporation
Phan Trong Quang
Rich Marianne R.
Tamoshunas Algy
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