Master-Slave Comparator Circuit With Hysteresis Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Static comparators in high-speed electronics suffer from significant hysteresis, which degrades performance and increases bit error rates, whereas adding a reset phase to compensate for hysteresis in dynamic comparators reduces the effective comparison time.
Innovation Solution
A comparator circuit with a master and slave latch configuration, including a hysteresis compensation circuit that applies predetermined signal level shifts based on the output signal level of the slave latch to minimize the difference between high-to-low and low-to-high thresholds, thereby compensating for hysteresis without requiring a reset phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reset phase is added to compensate for hysteresis in dynamic comparators, then hysteresis is compensated, but the effective comparison time is reduced
Solution Approach 1:
The hysteresis compensation is performed preliminarily during the comparison phase by adjusting the reference voltage level based on the previous output state, rather than requiring a separate reset phase after comparison. This allows hysteresis compensation to occur in advance, maintaining full comparison time availability.
Solution Approach 2:
The hysteresis compensation function is merged with the main comparison operation by integrating the compensation mechanism into the existing comparator circuitry, specifically by combining it with the reference voltage generation and the comparison logic, eliminating the need for a separate reset phase.
2Reliability
If hysteresis compensation is implemented in static comparators, then decision robustness is improved, but device complexity increases
Solution Approach 1:
The hysteresis compensation is achieved through feedback from the comparator output to the reference voltage generation stage. The output state feeds back to adjust the reference voltage level, creating a feedback loop that automatically compensates for hysteresis without requiring additional complex control logic or multiple separate circuits.
Solution Approach 2:
The reference voltage generation circuit is given multiple functions: it not only provides the reference voltage for comparison but also implements hysteresis compensation by adjusting its output based on the comparator state. This multi-functionality avoids adding separate dedicated hysteresis compensation circuitry, thereby limiting complexity increase.
Data Source
AI summary
An aspect of the disclosure includes a comparator circuit comprising: a master latch comprising a first amplifier circuit and a first latch circuit coupled to an output of the first amplifier circuit; a slave latch comprising a second amplifier circuit having an input coupled to the output of the first amplifier circuit, and a second latch circuit coupled to an output of the second amplifier circuit; and a hysteresis compensation circuit coupled to the output of the second amplifier circuit and configured to cause a first predetermined signal level shift of an output signal of the first amplifier circuit in response to a high signal level at the output of the second amplifier circuit, and configured to cause a second predetermined signal level shift of an output signal of the first amplifier circuit in response to a low signal level at the output of the second amplifier circuit.