Noise reduction in CMOS driver using capacitor discharge to gene

Details Noise reduction in CMOS driver using capacitor discharge to gene Noise reduction in CMOS driver using capacitor discharge to gene

1989-09-19

1990-11-20

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307246, 307263, 307362, 307469, H03K 1716

Patent

active

049721011

ABSTRACT:
A pull-up or pull-down transistor in an output buffer or the like is controlled to limit dI/dt and thus reduce noise. This control employs a series transistor in the driver circuit which has a modulating voltage applied to its gate. This modulating voltage is generated in a circuit which uses precision-timed clocks as a reference so that variations in electrical parameters (process, temperature and power supply dependent) will not cause variation in circuit noise. A dummy driver circuit is used to discharge a capacitor at a rate dependent upon the modulating voltage, and the capacitor voltage is compared with a reference at a time determined by the precision clock. The result of the comparison is used to increment or decrement the modulating voltage.

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