Current mode reference voltage source with low power supply voltage

Abstract

The invention discloses a current mode reference voltage source based on downward current compensation. The current mode reference voltage source can work under quite low power voltage, and output voltage of the reference voltage source can be changed by adjusting device parameters. The current mode reference voltage source comprises a compensation current generating circuit and a reference voltage generating circuit.

Description

technical field [0001] The invention belongs to the field of integrated circuit design, and is used for generating a reference voltage in an integrated circuit. Specifically, it relates to a technology for temperature compensation by using the subtraction of two currents with the same variation within a certain operating temperature range. Background technique [0002] Current / voltage references are the basis for various circuit behaviors, and the stability of the reference circuit directly affects the overall circuit performance. With the increase in the complexity of integrated circuits and the development of low-voltage and low-power designs, reference circuits usually need to work normally at low supply voltages, and also need to be able to provide non-standard output reference voltages according to circuit requirements. Bandgap voltage reference is currently the most widely used and developed reference voltage source structure in integrated circuits. In typical bandgap...

AI Technical Summary

Problems solved by technology

However, as far as the current bandgap voltage reference is concerned, the following two significant defects limit its application range:

[0003] 1. The output voltage of a typical bandgap voltage reference is about 1.2V, which limits its power supply voltage to be greater than 1.2V. With the advancement of integrated circuit technology and the development of portable consumer electronics products, the power supply voltage of integrated circuits is getting higher and higher. lower and lower, the typical bandgap voltage reference is no longer applicable;

[0004] 2. The output voltage of a typical bandgap voltage reference is a fixed value, and with the increase of the complexity of the integrated circuit, a reference voltage different from the typical bandgap output voltage is often required in the circuit, so it lacks sufficient flexibility

At present, there are precedents for this type of voltage-mode reference voltage source working at a supply voltage of 0.6V, but its output voltage is still not adjustable; and for the existing current-mode reference voltage source, although the output voltage is adjustable, However, it also includes a PTAT (Proportional to Absolute Temperature) current generating circuit and a CTAT (Complementary to Absolute Temperature) current generating circuit. The effect of the voltage source is more serious

Images