pianomania
Member level 5
i design a cap type charge sharing sar adc ,
it needs to be dischage when each conversion cycle.
please see the pic show as below ,
the node vx=0 when sampling mode , and it is pull down by N3.
but when the hode mode , the N3 should be disable.
but , since the vx will be negative voltage , the MOS N3 body diode will flow to have a leakage..
how to solve this problem , to replace the switch in another kind of solution ?
it needs to be dischage when each conversion cycle.
please see the pic show as below ,
the node vx=0 when sampling mode , and it is pull down by N3.
but when the hode mode , the N3 should be disable.
but , since the vx will be negative voltage , the MOS N3 body diode will flow to have a leakage..
how to solve this problem , to replace the switch in another kind of solution ?