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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> CMOS Inverter https://designers-guide.org/forum/YaBB.pl?num=1385248133 Message started by Mikay on Nov 23rd, 2013, 3:08pm |
Title: CMOS Inverter Post by Mikay on Nov 23rd, 2013, 3:08pm Does anyone has any idea on how to make minor modification to the CMOS inverter(can be multiple stage cascaded if necessary) so that it's input threshold voltage is approximately independent to the power supply? Say, when the power supply is changed from 3V to 6V, the switching point of the inverter is always around 2V(or a very tight range 1.8~2.2). This is will very helpful in my BGR startup circuits design. Really appreciate your time. |
Title: Re: CMOS Inverter Post by aaron_do on Nov 25th, 2013, 4:36am Depends how minor I guess...you could use a comparator, but you need some kind of reference (a Vth reference maybe). Aaron |
Title: Re: CMOS Inverter Post by Mikay on Nov 25th, 2013, 12:50pm Thanks Aaron. The problem has been solved. The idea used is almost the same as yours. Other than using a threshold reference which has a litle bit wider distribution, with a DIODE reference, the Monte Carlo simualtion shows the inout threshold voltage of the inverter(cascaded) is now between 1.8 and 2.4. This will make my BGR well starts up across all corners and full 3~6V power supply range. -Mikay |
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