Duty cycle control buffer circuit with selective frequency divid

Details Duty cycle control buffer circuit with selective frequency divid Duty cycle control buffer circuit with selective frequency divid

1998-02-20

2000-05-09

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

327236, 327244, 331 40, 331177R, H03K 3017

Patent

active

060609222

ABSTRACT:
A duty cycle control buffer uses an edge detector input stage to detect the transitions of an unpredictable clock signal input. The edge detector generates one shot output signals in synchronism with the clock signal. A pulse width controllable monostable multivibrator converts the one shot signals into rectangular pulses, at the same frequency as the original clock input. The rectangular pulses are inverted and then averaged, to provide a voltage input to one side of an operational amplifier. A reference voltage is supplied to the other side of the operational amplifier, such that the difference between the average voltage and the reference voltage generates an output control voltage from the operational amplifier. This control voltage provides negative feedback to a pulse width control stage within the monostable multivibrator, thereby adjusting the pulse width of the rectangular pulse output until a steady state is reached. A frequency divider circuit may be inserted in front of the edge detector to add a selective frequency dividing capability to the duty cycle control buffer.

REFERENCES:
patent: 3952236 (1976-04-01), Hoover
patent: 4479216 (1984-10-01), Krambeck et al.
patent: 5061907 (1991-10-01), Rasmussen
patent: 5081428 (1992-01-01), Atriss et al.

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