Single shot with pulse width controlled by reference oscillator
First Claim
1. A circuit for generating an output signal having a single-shot pulse with a desired time duration, said duration controlled by a reference oscillator signal, said reference oscillator signal having a pulse width and a period, comprising:
- a reference signal said reference signal having a pulse width;
means for matching said reference signal pulse width to said reference oscillator signal pulse width; and
means for generating said output signal having a single-shot pulse whose width is related to the pulse width of said reference signal by a fixed factor, said output signal being triggered by an output signal,wherein said input signal has no pulse width, phase or frequency relationship to said reference oscillator signal.
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Abstract
A one-shot structure for controlling pulse widths on integrated circuit chips by using a reference oscillator to compensate the rate at which a capacitor is discharged through a transistor in a reference pulse generator. Compensation is accomplished by using a feedback circuit to control the voltage applied to the transistor in the reference pulse generator. The reference oscillator is used with the reference pulse generator to generate a control voltage which matches the reference pulse to the reference oscillator. The same control voltage is then applied to a desired pulse generator. The desired pulse generator has the same one-shot structure as the reference pulse generator, namely a capacitor and a discharge transistor. The pulse width of the desired pulse generator is determined by scaling the geometry of the capacitor and the discharge transistor in the desired pulse generator relative to the geometry of the corresponding components in the reference pulse generator. These relative geometries remain consistent within relatively small tolerances for a chip in a typical integrated circuit process, compared to relatively large variances between design values and absolute chip geometries.
119 Citations
12 Claims
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1. A circuit for generating an output signal having a single-shot pulse with a desired time duration, said duration controlled by a reference oscillator signal, said reference oscillator signal having a pulse width and a period, comprising:
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a reference signal said reference signal having a pulse width; means for matching said reference signal pulse width to said reference oscillator signal pulse width; and means for generating said output signal having a single-shot pulse whose width is related to the pulse width of said reference signal by a fixed factor, said output signal being triggered by an output signal, wherein said input signal has no pulse width, phase or frequency relationship to said reference oscillator signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification