Micropower double ended limit detector

Posted on Apr 17, 2012

The detector uses three sections of an L144 and a DC4011 type CMOS NAND gate to make a very low power voltage monitor. If the input voltage, Vin, is above Vhigh or below Vlow, the output will be a logical high. If (and only if) the input is between the limits will the output be low

Micropower double ended limit detector
Click here to download the full size of the above Circuit.

The 1 megohm resistors Rl, R2, R3, and R4 translate the bipolar ±10V swing of the op amps to a 0 to LOV swing acceptable to the ground-referenced CMOS logic.

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