Circuit for controlling duty cycle distortion

Details Circuit for controlling duty cycle distortion Circuit for controlling duty cycle distortion

2008-09-09

2008-09-09

Cox, Cassandra (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S172000

Reexamination Certificate

active

11443813

ABSTRACT:
A circuit for controlling a duty cycle of a clock signal. The circuit includes a duty cycle control loop that includes a voltage-to-duty cycle (V-to-DC) converter, an output driver, a duty-cycle-to voltage (DC-to-V) converter, and an operational amplifier. The V-to-DC converter receives an input clock signal. The output driver is coupled to the V-to-DC converter and provides an output clock signal that is associated with a duty cycle distortion value. The DC-to-V converter converts the output clock signal to an average voltage. The operational amplifier amplifies an error between the average voltage and a reference voltage. The error is fed back to the V-to-DC converter through a negative feedback loop, wherein the V-to-DC converter adjusts a duty cycle of the input clock signal based on the error.

REFERENCES:
patent: 5963071 (1999-10-01), Dowlatabadi
patent: 6603339 (2003-08-01), Atallah et al.
patent: 7088160 (2006-08-01), Harms et al.

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