Bessel-Thompson Delay High Pass Filter

Inverted Bessel-Thompson Delay High Pass Filter 

A quick modification to the Bessel-Thompson filter leaves us with a high pass filter. This filter does not have the built-in delay like the low pass version, but it does provide an interesting response. The schematic and the breadboard results are shown in Fig. 3.36 and Fig. 3.37, respectively. The measurements that will be made for comparison purposes are the step response height and the time until the second cross of the zero axis. 

For each filter, an AC analysis was run for comparison between the different software packages. These results are displayed along with the step response from each of the filters. The results of the IsSpice model are displayed in Figs. 3.38 and 3.39. The PSpice results are shown in Figs. 3.40 and 3.41. The results from the Micro-Cap model are shown in Figs. 3.42 and 3.43. 

Advantages Moderate parts count Disadvantages Underdamped response 

File names hpbessel (IsSpice), bess-hp (PSpice), besunic5 (Micro-Cap) 

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