diego.fan
Member level 3
Hi, I'm trying to design a switched capacitor amplifier based on Razavi's book.
My question is: how to decide bandwidth of this OP?
The requirement contains gain error and setting error. The minimum input swing and maxium output swing and frequency_sampling are known. So the gain in closeloop is also known(assuming it equals to 16.) After calculation, I found none of requirement is related to the BW of op.
Here is my calculation. You see, gain error is related to the gain of OP.
setting error is related to the GM of OP. They are not related to the BW of OP.
So the only one left is freq_sampling(assuming it equals to 50Mhz). I'm puzzled about how to get BW of op from this freq_sampling?
BW=50MHz?
BW=100Mhz?
GBW=100Mhz*16?
Another question is: If I get a requirement of BW, if my OP cannot fit for this BW requirement, which parameter will be affected? Because I think none of gain error or setting error is related to the BW of OP.
My question is: how to decide bandwidth of this OP?
The requirement contains gain error and setting error. The minimum input swing and maxium output swing and frequency_sampling are known. So the gain in closeloop is also known(assuming it equals to 16.) After calculation, I found none of requirement is related to the BW of op.
Here is my calculation. You see, gain error is related to the gain of OP.
setting error is related to the GM of OP. They are not related to the BW of OP.
So the only one left is freq_sampling(assuming it equals to 50Mhz). I'm puzzled about how to get BW of op from this freq_sampling?
BW=50MHz?
BW=100Mhz?
GBW=100Mhz*16?
Another question is: If I get a requirement of BW, if my OP cannot fit for this BW requirement, which parameter will be affected? Because I think none of gain error or setting error is related to the BW of OP.