New baseline restorer based on feedforward differential compensation

The noise indices regarding the rectangular shaper have been calculated. The results indicate that the time constant of the BLR should be larger than about 20 times that of the prefilter pulse width. A new feedforward type baseline restorer has been developed for the quasi-rectangular shaper. Its time constant can be designed arbitrarily by the value of its components C and R. Therefore, it is simple to determine the compromising point of the delta noise index and the tracking ability for baseline fluctuation. The equivalent circuit of this restorer has an attenuator following the CR differentiator. The existence of the attenuator in the equivalent circuit is a difference from the others.>