By Eric H. Glendinning, Norman Glendinning
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Example text
Hence obtain a transfer function to meet the above specification. (3) Find values for ε and η using the following specification for an active low-pass filter: r Maximum passband attenuation Amax = 2 dB, r Minimum stopband attenuation Amin = 12 dB, r Passband edge frequency ω p = 1 krs−1 , r Stopband edge frequency ωs = 2 krs−1 . 1 FILTER TYPES The procedure for designing active filters to meet a specification is shown in Fig. 1. The first four blocks explain how a transfer function is obtained using a specification to select a suitable loss function.
29. Replace the VAC generators with VSIN generators and fill in the parameters such as VOFF (the offset voltage). Set up a transient analysis and observe the output. Use the FFT icon button to observe the frequency content and measure the relative amplitudes of each frequency in the spectrum output and compare the amplitudes to previous values. 3. Investigate the effect of varying the cut-off frequency using the PARAM part in Fig. 30. 4. 591 kHz. Set the VSIN generator to this frequency and perform a transient analysis: Run to time = 2 ms and Maximum step size = 1 µs.
For example, a first-order normalized Butterworth loss function is 1 + $, where $ is the normalized complex frequency variable. , H(s ) = 1 A($) = $=S/ω p ωp 1 = . 11) to a low-pass CR transfer function T F(s ) = ωp Vo (s ) 1/s C 1 1/C R = = = = . 12) is a first-order Butterworth approximation loss function, with a pole at s = −ω p = −1/C R. We may plot this transfer function using a Laplace part shown in Fig. 1. From the Analysis Setup, select AC Sweep/Logarithmic, Point/Decade = 1000, Start Frequency = 1, and End Frequency = 1000k.