I have couple of questions:

1. A square signal goes through a low pass filter and in the output of a circuit we get a sine. What happens there? Give a scheme?

This is really weird, because, from what I have studied so far, only sine inputs are sine outputs from an LPF filter. I am reading it here. According to my source, it should be a triangular output, how comes it is sine?

2. Suppose that we have an AM DSB-SSB signal, with modulation index μ = 1. We degrade the carrier by 20dB and we also cut the one sideband. We send the result of this to an amplifier of +20dB gain. So at the output, we receive power that equals to 200W. How much was the original power of the carrier?

SSB has only one sideband to begin with, so only carrier is left after the sideband is cut. We degrade carrier by -20 and then we amplify it by +20, so I believe that original power of carrier is also 200W. But it looks so extremely simple, anyone could shed some light here?

I have couple of questions:

1. A square signal goes through a low pass filter and in the output of a circuit we get a sine. What happens there? Give a scheme?

   This is really weird, because, from what I have studied so far, only sine inputs are sine outputs from an LPF filter. I am reading it here. According to my source, it should be a triangular output, how comes it is sine?

2. Suppose that we have an AM DSB-SSB signal, with modulation index μ = 1. We degrade the carrier by 20dB and we also cut the one sideband. We send the result of this to an amplifier of +20dB gain. So at the output, we receive power that equals to 200W. How much was the original power of the carrier?

   SSB has only one sideband to begin with, so only carrier is left after the sideband is cut. We degrade carrier by -20 and then we amplify it by +20, so I believe that original power of carrier is also 200W. But it looks so extremely simple, anyone could shed some light here?

I have couple of questions;

1. A square signal goes through a low pass filter and in the output of a circuit we get a sine. What happens there? Give a scheme?

This is really weird, because, from what I have studied so far, only sine inputs are sine outputs from an LPF filter. I am reading it here: http://www.learnabout-electronics.org/ac_theory/filters85.php  . According to my source, it should be a triangular output, how comes it is sine  ?

2. Suppose that we have an AM DSB-SSB signal, with modulation index μ=1. We degrade the carrier by 20dB and we also cut the one sideband. We send the result of this to an amplifier of +20dB gain. So at the output, we receive power that equals to 200W. How much was the original power of the carrier?

SSB got only one sideband to begin with, so only carrier is left after the sideband is cut. We degrade carrier by -20 and then we amplify it by +20, so I believe that original power of carrier is also 200W. But it looks so extremely simple, anyone could shed some light here?

I have couple of questions:

1. A square signal goes through a low pass filter and in the output of a circuit we get a sine. What happens there? Give a scheme?

This is really weird, because, from what I have studied so far, only sine inputs are sine outputs from an LPF filter. I am reading it here. According to my source, it should be a triangular output, how comes it is sine?

2. Suppose that we have an AM DSB-SSB signal, with modulation index μ = 1. We degrade the carrier by 20dB and we also cut the one sideband. We send the result of this to an amplifier of +20dB gain. So at the output, we receive power that equals to 200W. How much was the original power of the carrier?

SSB has only one sideband to begin with, so only carrier is left after the sideband is cut. We degrade carrier by -20 and then we amplify it by +20, so I believe that original power of carrier is also 200W. But it looks so extremely simple, anyone could shed some light here?