Amplifier with active duty cycle correction

Details Amplifier with active duty cycle correction Amplifier with active duty cycle correction

1995-09-18

1996-11-05

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

327170, 327309, 327536, 327563, H03K 3017

Patent

active

055721583

ABSTRACT:
A circuit is provided which actively corrects the duty cycle of a periodic signal such as a clock signal. The amplifier circuit includes a duty cycle error measurement circuit which measures the error of the output signal from a predetermined duty cycle, for example, 50% duty cycle. A correcting signal is generated from the error signal output by the duty cycle error measurement circuit. The correcting signal is combined with the uncorrected input signal to the circuit to function to offset the signal in order to correct the duty cycle, the combined signals are input to an integrating capacitance to generate a slew limited signal. By varying the amount of the correcting signal and therefore the symmetry of the slew limited signal, the duty cycle of the output can be varied to generate a signal with the desired duty cycle.

REFERENCES:
patent: 4644196 (1987-02-01), Flannagan
patent: 4724337 (1988-02-01), Maeda et al.
patent: 4789799 (1988-12-01), Taylor et al.
patent: 4992757 (1991-02-01), Shin'e
patent: 5182476 (1993-01-01), Hanna et al.
Patent Abstract of Japan-vol. 16, No. 158 (E-1191), 17 Apr. 1992 & JPA04010810 (Sharp Corp) 16 Jan. 1992.
Patent Abstract of Japan-vol. 11, No. 73 (E-486), 5 Mar. 1987 & JPA61228720 (Hitachi Cable Ltd) 11 Oct. 1986.

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