wccheng
Full Member level 5
Dear all,
I have question about the frequency band conversion problem. I hope anyone explain it to me. In the up-conversion mixer, this is a quadrature input and differential output mixer. Then, the differential signal combines and gives out a single output. My problem is arisen.
If a modulated signal with bandwidth=10MHz (0-10MHz signal bandwidth) enters the quadrature up-conversion mixer, what is the output signal like at the single ended output. Does it contain two 10MHz bandwidth at the left hand side of the LO and right hand side of the LO respectively? I mean there are one at 990MHz-1GHz and another one at 1GHz-1.01GHz (assume LO=1GHz). If this is correct, I have a question. As I just give a single tone into the quadrature input of the up-conversion mixer, the single ended output just could see the LO+RF tone and the LO-RF tone will be cancel out. Then, which one is correct?
Thanks,
wccheng
I have question about the frequency band conversion problem. I hope anyone explain it to me. In the up-conversion mixer, this is a quadrature input and differential output mixer. Then, the differential signal combines and gives out a single output. My problem is arisen.
If a modulated signal with bandwidth=10MHz (0-10MHz signal bandwidth) enters the quadrature up-conversion mixer, what is the output signal like at the single ended output. Does it contain two 10MHz bandwidth at the left hand side of the LO and right hand side of the LO respectively? I mean there are one at 990MHz-1GHz and another one at 1GHz-1.01GHz (assume LO=1GHz). If this is correct, I have a question. As I just give a single tone into the quadrature input of the up-conversion mixer, the single ended output just could see the LO+RF tone and the LO-RF tone will be cancel out. Then, which one is correct?
Thanks,
wccheng