1. The problem statement, all variables and given/known data 2. Relevant equations See picture 3. The attempt at a solution I am unsure how this filter works (i am in an intro to analog circuits class and we barely covered active filters). Here is my attempt at drawing the input voltage: you can see I used the 20KHz wave as an envelope for the 100Khz signal, drawing 5 full waves of the 100KHz within one half wave of the 20KHz, but i am not fully sure if this is the correct thing to draw as i have never worked with overlapping signals... As for the voltage at the point specified, i believe that all that does is cut off the bottom portion of what I drew as well as decrease the voltage by 0.7 volts (The standard voltage drop of a diode). But i am not sure if this is correct. For part B I have no clue how to approach this. I didn't know this filter had gain, i thought active filters just filtered... EDIT: For part a i just realized that there is a capacitor acting as ripple control, so the output should not just be the top half of the input, but how do i calculate this ripple control? Still super confused about part b. EDIT 2: I just realized my scaling is off, i should have 2.5 waves of the 100KHz within on half wave of the 20KHz, so 5 waves total over the full length of the 20KHz.