Design and Analysis of Enhanced Cascode Cross-Coupled Comparator

In contemporary analog and mixed-signal electronic systems, dynamic comparators are essential components, especially for applications requiring accuracy and speed. Low-power, high-speed dynamic comparators are essential for the design of digital I/O circuits and high-speed analog-to-digital converters (ADCs). Still, a lot of dynamic comparators work best when the input difference voltage is high enough. These comparators’ central component is frequently a pre-amplifier with an inverter-based CMOS input pair enclosed in a latch structure, which is dynamically driven by a floating reservoir capacitor. Because of the preamplifier’s limited strength, these comparators operate poorly at small input difference voltages, which presents a hurdle. Particularly in high-resolution, high speed ADC applications, this degradation is undesirable. The project suggests a cascode cross-coupled comparator as a solution to this problem. The primary goals of this effort are to lower the common-mode voltage that the latch experiences and increase the preamplifier’s differential gain. Significantly faster regeneration is the outcome of these enhancements, especially when handling minor input differential voltages. Through simulation, the suggested comparator design is carefully analyzed and tested with Mentor Graphics tools and determined the latency of 33.3ps.