Nonlinear edge peaking system and method

Claim 1

A nonlinear edge peaking system for decreasing the rise and fall times of input signal transitions while maintaining a substantially similar frequency response and attenuating the introduction of excessive preshoot and/or overshoot, said system including: first circuit means for delaying said input signal; second circuit means connected in parallel with said first circuit means including means for taking the widened second derivative of said input signal and means for taking the absolute value of said second derivative of said input signal and for adding a preselected bias to said input signal, whereby the output of said second circuit means is the approximate absolute value of the widened second derivative of said input signal having a preselected bias; third circuit means connected in parallel with said first circuit means and said second circuit means including means for taking the first derivative of said input signal and for delaying said input signal such that the outputs of said second circuit means and said first circuit means are time coincident, whereby the output of said third circuit means is the delayed first derivative of the input signal; fourth circuit means including means for combining said output of said second circuit means and said output of said third circuit means in a preselected manner and means for modifying said signal produced by combining said output of said second circuit means and said third circuit means to produce a correction signal, and means for adding said correction signal to the delayed input signal produced by said first circuit means to produce an overall waveform modified to contain reduced rise and fall times at the signal transitions with attenuated preshoot and overshoot.

Claim 11

A method for peaking an input signal to produce an output peaked signal having decreased rise and fall times at the signal transitions while maintaining a substantially similar frequency response and without introduction of excessive preshoot and/or overshoot, said method including the steps of: delaying the input signal by a preselected time; producing a first output signal which is the approximate absolute value of a widened second derivative of the input signal having a preselected bias added thereto; producing a second output signal which is a delayed first derivative of the input signal; producing a waveform which is the result of combining said first output signal and said second output signal; differentiating and inverting said waveform to produce a correction signal; and adding said correction signal produced by differentiating and inverting said waveform to the delayed input signal to produce a peaked waveform modified to contain reduced rise and fall times at the signal transitions without introducing excessive preshoot and overshoot.

Claim 12

A method for peaking an input signal to produce an output peaked signal having decreased rise and fall times at the signal transitions while maintaining a substantially similar frequency response and without introduction of excessive preshoot and/or overshoot, said method including the steps of: delaying the input signal by a preselected time; producing a first output signal which is the approximate absolute value of a widened second derivative of the input signal having a preselected bias added thereto; producing a second output signal which is a delayed first derivative of the input signal; producing a waveform which is the result of combining said first output signal and said second output signal; differentiating and inverting said waveform to produce a correction signal; and adding said correction signal produced by differentiating and inverting said waveform to the delayed input signal to produce a peaked waveform modified to contain reduced rise and fall times at the signal transitions without introducing excessive preshoot and overshoot.