Circuit and method for duty cycle control

Details Circuit and method for duty cycle control Circuit and method for duty cycle control

1980-11-28

1982-10-19

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328 58, 307265, H03K 504

Patent

active

043552838

ABSTRACT:
Circuitry responsive to an input clock (C-clock) whose duty cycle is unknown produces two clocks (A and B) in addition to the input clock. One (A-clock) of the two clocks is skewed to have a greater duty cycle than the C-clock and the other one (B-clock) of the two clocks is skewed to have a lower duty cycle than the C-clock. The two phases of each one of the A and B-clocks are compared and control signals are produced indicative of the values of the respective duty cycles and, by deduction, of the duty cycle of the C clock. The values of the control signals determine which one of the A, B, or C clocks is selected as the system clock.

REFERENCES:
patent: 3697879 (1972-10-01), Holliday
patent: 3805167 (1974-04-01), Nash et al.
patent: 4241418 (1980-12-01), Stanley
patent: 4330751 (1982-05-01), Swain

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