Two-stage full-dynamic comparator for SAR ADC and working method of two-stage full-dynamic comparator

Abstract

The invention relates to a two-stage full-dynamic comparator for an SAR ADC and a working method of the two-stage full-dynamic comparator. The comparator comprises that two voltage input ends of a first-stage dynamic preamplifier with the current source serve as two voltage input ends of the comparator; two output ends of the first-stage dynamic pre-amplifier with the current source are connectedwith two input ends of the SA dynamic latch through the second-stage dynamic bias pre-amplifier; two output ends of the SA dynamic latch are used as two output ends of the comparator; clock signal ends of the three modules are connected to serve as a first clock signal end CLKC of the comparator; the second-stage dynamic bias type pre-amplifier further comprises a second clock signal end serving as a second clock signal end CLKCB of the comparator, a pair of inverted clock signals are input into the CLKC and the CLKCB, and the first-stage dynamic pre-amplifier with the current source further comprises two bias voltage input ends. Static power consumption does not need to be considered, influence caused by imbalance is reduced, input noise is reduced, and gain and linearity are improved byusing the two-stage dynamic pre-amplifier.

Description

technical field [0001] The invention relates to a secondary full dynamic comparator for SAR ADC and its working method. Background technique [0002] With the continuous development of science and technology, the Internet of Things gradually appears in people's field of vision and becomes more and more important. The Internet of Things is a network that can be extended vertically and horizontally based on the Internet. The world has experienced the industrial age, the PC Internet era, the mobile Internet of Things era, and the current Internet of Things era. It can be seen that the Internet of Things has become the mainstream of today's society. The rapid development of the Internet of Things will give birth to the progress of many emerging industries. Taking China as an example, the country is vigorously promoting the integration of industrialization and informatization. The Internet of Things is the basic node of smart home, smart transportation, smart medical care, smart ...

AI Technical Summary

Problems solved by technology

However, the current dynamic comparator uses static pre-amplification plus dynamic latch. Because of the existence of dynamic latch, it is also called dynamic comparator, but the static power consumption of the pre-amplification part still cannot be reduced. The gain of the upper pre-amplifier is insufficient, resulting in an increase in equivalent input noise, so it has a great impact on the overall power consumption and accuracy of the ADC, resulting in performance degradation

Images