A Novel Low Power Comparator

Abstract

The invention discloses a novel low-power-consumption comparator circuit and an achievement method thereof. The comparator circuit comprises an input end, a current mirror active load and a tail current source. The achievement method of the comparator comprises the following steps of firstly using one way of reference voltage and two ways of voltage to be compared as input signals, performing comparison through two comparators and then outputting a result through the output end. The novel low-power-consumption comparator circuit is formed by only seven MOS tubes (three PMOS tubes and four NMOS tubes or four PMOS tubes and three NMOS tubes), a circuit structure is simplified, and the novel low-power-consumption comparator circuit has the advantages of being low in power consumption, low in cost and high in reliability.

Description

technical field [0001] The invention mainly relates to the field of clock oscillator design, in particular to a circuit structure of a voltage comparator. Background technique [0002] In the clock generation circuit, the on-chip RC oscillator is widely used because of its low cost, simple implementation, easy integration, and very easy tuning. The comparator is the core circuit of the clock generation module, and its performance determines many indicators of the output clock. The new low-power comparator mainly realizes the comparison of the charging voltage at both ends of the capacitor in the RC oscillator with the reference voltage, and generates a high and low pulse waveform that changes with the capacitor charging voltage. [0003] Conventional voltage comparator circuits see figure 1 . figure 1 The medium voltage comparator has only one set of inputs. The comparator is composed of two PMOS transistors and three NMOS transistors. The gate and drain of the PMOS trans...

AI Technical Summary

Problems solved by technology

[0004] Compared with the novel voltage comparator in the present invention, the traditional voltage comparator has two defects: the traditional voltage comparator has only two input terminals, and when two input signals are compared with the same reference voltage, two comparators are needed work at the same time, which increases the power consumption of the circuit and the area of ​​the circuit, thereby increasing the cost

At the same time, two independent comparators increase the mismatch factor of the circuit, which will affect the reliability and other performance of the circuit.

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