System and method for compensating pulse generator for...

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Clock or pulse waveform generating

Reexamination Certificate

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C327S512000

Reexamination Certificate

active

08030985

ABSTRACT:
An apparatus for generating a pulse having a pulse width substantially independent of process variation in resistive and capacitive values. The apparatus includes a PTAT current source to generate a first current to charge a capacitor to produce a first voltage; a ΔVGS current source to generate a second current through a resistor to produce a second voltage V2; a comparator to generate the pulse in response to the first and second voltages; and a circuit to enable the charging and discharging of the capacitor. The use of the distinct current sources (e.g., PTAT and ΔVGS) enables the pulse generator to be configured substantially process independent of resistive value. The use of a MOSFET capacitor for the capacitor enables the pulse generator to be made substantially process independent of capacitive value. An additional bandgap current source in parallel with the ΔVGS current source reduces the pulse width dependency on temperature.

REFERENCES:
patent: 5592111 (1997-01-01), Wong
patent: 5604467 (1997-02-01), Matthews
patent: 5912593 (1999-06-01), Susak et al.
patent: 5926042 (1999-07-01), Talaga, Jr.
patent: 6924709 (2005-08-01), Bashar
patent: 7413342 (2008-08-01), Mukherjee
patent: 7443226 (2008-10-01), Holloway
patent: 2008/0238518 (2008-10-01), Guo et al.

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