A circuit for compensating the voltage coefficient of the reference current

Abstract

The invention discloses a circuit for compensating a voltage coefficient of a reference current. A first current and a second current respectively flow through a first transistor and a second transistor; a drain electrode and a grid electrode of the first transistor are connected with each other and are connected with a grid electrode of the second transistor; a source electrode of the second transistor is grounded through a resistor; a source electrode of the first transistor is connected to a drain electrode of a compensation transistor; a source electrode of the compensation transistor is grounded; a grid electrode of the compensator is connected to a supply voltage. The circuit for compensating the voltage coefficient of the reference current breaks through a linear relationship between the reference current and the supply voltage, that is to say, realizes a compensation function for the voltage coefficient and improves the value of the current when the voltage is lowest. Therefore, the supply voltage for normal work of subsequent circuits is reduced, and the power voltage range for normal work is enlarged.

Description

technical field [0001] The invention relates to an analog integrated circuit clock reference current circuit, in particular to a circuit for compensating the voltage coefficient of the reference current. Background technique [0002] Commonly used reference current generation circuits need to provide reference currents for other circuit modules for biasing and other functions. Therefore, the reference current generating circuit usually needs to start working before other circuits start working or always be in working state, so the reference current generating circuit needs to provide a current source for other circuits at the cost of a small layout and power consumption. Such as figure 1 As shown, the currents I1 and I2 flow through the transistors N1 and N2 respectively, wherein the currents I1 and I2 are in a mirror image relationship, the drain and gate of the transistor N1 are connected and connected to the gate of the transistor N2, the source of the transistor N1 is g...

AI Technical Summary

Problems solved by technology

The current generated by such a low-power reference current generating circuit often has an obvious linear relationship with the power supply voltage, generally increases with the increase of the power supply voltage, and the current is often the smallest at the lowest power supply voltage, so the subsequent current use circuit At low supply voltage conditions a significant impact

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