Micropower double ended limit detector

  
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 - schematic

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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