A High-precision Reference Voltage Source Circuit Using Quadratic Positive Temperature Coefficient Compensation

Abstract

The invention discloses a high-precision reference voltage source circuit.The high-precision reference voltage source circuit comprises a start circuit, a PTAT current generating circuit and a reference voltage generating circuit which are electrically connected in sequence.The start circuit is used for generating a start signal of the beginning of the circuit, so that the whole PTAT current generating circuit and the reference voltage generating circuit are completely opened, and then the start circuit is automatically closed; the PTAT current generating circuit is used for generating reference current forming a proportionality coefficient with positive temperature.The reference voltage generating circuit is used for generating high-precision reference voltage irrelevant to temperature.The high-precision reference voltage source circuit is characterized in that two positive temperature coefficient compensation items are embedded on the basis of traditional positive temperature coefficient mutual compensation during reference voltage generation, the regulating range of the reference voltage is effectively widened, errors brought by single-item regulation are efficiently compensated, and finally the precision of the reference voltage is effectively improved.The structure of the circuit is greatly simplified, power consumption is reduced, and the capacity of resisting high-frequency power source ripple interference is improved.

Description

technical field [0001] The present invention relates to the field of reference voltage source circuits, in particular to a high-precision reference voltage source circuit. Background technique [0002] With the development of integrated circuits and processes, an accurate reference source becomes more and more important in the circuit. The performance of analog circuits largely requires the support of stable current and voltage bias circuits. The reference source Performance will affect the power consumption, power supply rejection ratio, open-loop characteristics and temperature characteristics of the entire circuit to a certain extent. At the same time, reference voltage sources are widely used in A / D and D / A converters, data acquisition systems, voltage regulators, and various electronic measuring equipment. Their accuracy and stability directly determine the accuracy of the entire system, which in turn affects the resistance of the entire equipment Interference ability....

AI Technical Summary

Problems solved by technology

[0004] The traditional reference voltage source circuit can produce a temperature coefficient of 10 in the temperature range of -20 ~ 120 ℃. -4 V / °C reference voltage, some reference voltage sources cannot even be used in low temperature places, especially below 0°C, which greatly restricts its application places

Moreover, due to the existence of operational amplifiers in the circuit, the index of the reference source is largely limited by the operational amplifier offset voltage (Offset), power supply voltage rejection ratio (PSRR), single power supply voltage, etc. In order to further improve the performance of the circuit, it is necessary to Structural improvement

Images