User`s guide

6
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12 Analo
g
Behavioral Modelin
g
minimum stop band attenuation is 50 dB. Assuming that the
input to the filter is the voltage at net 10 and output is a voltage
between nets 5 and 0, this will produce a PSpice A/D netlist
declaration like this:
ELOWPASS 5 0 CHEBYSHEV {V(10)} = LP 800 1.2K .1dB 50dB
HIPASS
The HIPASS part is characterized by two cutoff frequencies that
delineate the boundaries of the filter pass band and stop band.
The attenuation values, RIPPLE and STOP, define the
maximum allowable attenuation in the pass band, and the
minimum required attenuation in the stop band, respectively.
The HIPASS part provides one input and one output.
Figure 6-2 shows an example of a HIPASS filter device. This is
a high pass filter with the pass band above 1.2 kHz and the stop
band below 800 Hz. Again, the pass band ripple is 0.1 dB and
the minimum stop band attenuation is 50 dB. This will produce
a PSpice A/D netlist declaration like this:
EHIGHPASS 5 0 CHEBYSHEV {V(10)} = HP 1.2K 800 .1dB 50dB
BANDPASS
The BANDPASS part is characterized by four cutoff
frequencies. The attenuation values, RIPPLE and STOP, define
the maximum allowable attenuation in the pass band, and the
minimum required attenuation in the stop band, respectively.
The BANDPASS part provides one input and one output.
Figure 6-3 shows an example of a BANDPASS filter device.
This is a band pass filter with the pass band between 1.2 kHz and
2 kHz, and stop bands below 800 Hz and above 3 kHz. The pass
FS stop band frequency
FP pass band frequency
RIPPLE pass band ripple in dB
STOP stop band attenuation in dB
RIPPLE pass band ripple in dB
STOP stop band attenuation in dB
F0, F1,
F2, F3
cutoff frequencies
Fi
g
ure 6-2
HIPASS Filter Part
Example
Fi
g
ure 6-3
BANDPASS Filter
Part Example