A µW Power CMOS Window Detector Circuit with Adjustable Thresholds for Low-Power Applications

An adjustable threshold CMOS window detector based on latch comparator is proposed here which compares between two DC threshold values. The threshold values are user adjustable. The window detector is based on a Pre-amplifier based latch comparator which is a significant part of the Analog to Digital converter (ADC). The proposed circuit is designed in SCL 180nm standard CMOS technology 1.8 V power supply. The window detector generates output with a maximum frequency of 18 MHz and 55ns delay. The proposed circuit uses a custom designed XOR gate which takes input from the comparator. The adjustable window length can be closer to supply <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$V_{DD}$</tex> to Gnd. The total dynamic power consumption of the proposed circuit is <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$32\mu \mathrm{W}$</tex>, which is less than some of the recently reported works.