The roll-off of a lowpass Butterworth filter is 12 decibels per octave in the stopband. What is the filter order?

a simple Circuit with R =50 ohm and L = 200mH would be a) high or low pass filter? and b) with f0 = ?

-3dB point in frequency response of an active filter corresponds to  A.   absolute value negative 3dB of gain   B.   decrement of 3dB from maximum gain   C.   minimum gain attained   D.   minus 3dB of average gain value

2. The analog signal shown in the following figure is to be delta modulated. The sampling period and the step size are indicated by the grid on the figure. Draw the staircase function that follows the signal as closely as possible and write down the delta modulation output.