in p-sub process,as to the differential pmos input pair, the body can be connected to its source to eliminate body effect, and also body can be connected to vdd,
then can anybody tell me the other advantages and disadvantages of the two body connection?
thanks
connecting back gate to vdd will increase the the capacitance shunting the tail current source. This reduces output impedence of the tail current source at higher frequencies of common mode disturbance thereby degrading CM-DM performance of the diff amp.
connecting back gate to vdd will increase the the capacitance shunting the tail current source. This reduces output impedence of the tail current source at higher frequencies of common mode disturbance thereby degrading CM-DM performance of the diff amp.
I agree. If the source and bulk of differential pair are connected together, the pn junction capacitance between n-well and p-sub will be also connnected to the source of couple-pair.