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Bipolar DC-voltage detector offers sensitivity, precision

Posted: 20 Apr 2011     Print Version  Bookmark and Share

Keywords:op amps  NAND gate  bipolar DC voltages 

An important function in industrial and scientific applications is detecting the presence (or absence) of DC voltages in safety interlocks, automatic sequencers, etc. To detect the absence of large bipolar DC levels, the detector must assert a signal when its input is within a stable and precisely defined window around zero volts. The window width should be twice the maximum tolerable error voltage, and centred at zero volts.

Comprising two precision op amps (MAX4236), a voltage reference (MAX6143), a NAND gate, and associated components, the detector of bipolar DC voltages asserts a digital output signal when the input is within a ±100mV window, centred at 0V.

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