Low-power-consumption and low-delay current comparator based on Wilson current sources, and circuit module

Abstract

The invention provides a low-power-consumption and low-delay current comparator based on Wilson current sources, and a circuit module. The low-power-consumption and low-delay current comparator basedon the Wilson current sources comprises a first Wilson current source and a second Wilson current source serving as an input stage, a differential amplifier serving as an intermediate stage, and an output gain stage serving as an output stage, wherein a first input current and a second input current, which serve as comparison objects, are respectively input into the first Wilson current source anda second Wilson current source; an output end of the first Wilson current source and an output end of the second Wilson current source are respectively connected to two input ends of the differentialamplifier; and an output end of the differential amplifier is connected to the output gain stage. A current structure provided by the invention has the advantages of high comparison precision and a low-delay propagation characteristic.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a current comparator with low power consumption and low delay based on a Wilson current source and a circuit module. Background technique [0002] With the development of integrated circuits, high-performance circuit design has become a difficult problem, and current mode circuits have better transmission characteristics than voltage mode circuits. There is no need to consider the influence of stray capacitance and parasitic capacitance when working at high frequency, and it can work at low power supply voltage. It has better input margin characteristics than the voltage mode circuit when the static operating point is fixed. [0003] As an interface of an ADC (Analog-to-Digital Converter, analog-to-digital converter), the current comparator is responsible for converting an analog signal into a digital signal, so the performance of the current comparator has a great influence on...

AI Technical Summary

Problems solved by technology

The second type is to compare the double-ended input current. This structure is usually composed of a differential structure, and a differential amplifier is commonly used. The differential amplifier can suppress common-mode noise and improve the processing accuracy of the circuit, but the disadvantage of this type of circuit is that it improves the circuit. Complexity and tape-out area and cost, usually this structure is suitable for parallel ADC

However, this structure also has two disadvantages: first, when a small signal is input (for example, the input current difference is 100nA), single-stage amplification is not enough to output rail-to-rail voltage; second, this structure cannot compare the two-branch differential electric current

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