Method and apparatus for digital noise mask filtering

Details Method and apparatus for digital noise mask filtering Method and apparatus for digital noise mask filtering

2005-09-07

2009-08-04

Ngo, Chuong D (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

C327S551000

Reexamination Certificate

active

07571202

ABSTRACT:
A system and method for filtering spurious transitions from a digital signal is disclosed. The system includes a latch, a timer, and a logic circuit. Upon a transition of the digital signal, the latch holds the digital signal to block any additional transitions and the timer, which is connected to the output of the latch, begins a timing operation that creates a filter pulse. The output of the timer is then combined with the digital signal to filter the spurious transitions that may occur after the transition of the signal. The timer is implemented as an integrator that generates a ramp signal using a stable current source and a comparator that trips when the ramp signal passes a threshold. Use of the integrator and comparator saves space and reduces the system's operating current compared to the conventional approach.

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