Reference current source circuit based on self-bias structure

Abstract

The invention relates to a reference current source circuit based on a self-biasing structure. The reference current source circuit includes a first PMOS transistor, a second PMOS transistor, a first NMOS transistor, a second NMOS transistor, and a confinement circuit. The sources of the first PMOS transistor and the second PMOS transistor are connected to the power supply terminal, the gate of the first PMOS transistor is connected to the gate of the second PMOS transistor, and the drain of the first PMOS transistor is connected to the first PMOS transistor. The drain of the NMOS transistor is connected to the drain of the second NMOS transistor, the drain of the second PMOS transistor is connected to the drain of the second NMOS transistor, the gate of the first NMOS transistor is connected to the gate of the second NMOS transistor, and the second PMOS transistor is connected to the gate of the second NMOS transistor. The gate and drain of the transistor are connected, the gate of the first NMOS transistor is connected to the drain, the source of the first NMOS transistor and the source of the second NMOS transistor are respectively connected to a restraint circuit, and the restraint circuit The reference source current of the reference current source circuit can be made proportional to the temperature or the influence of the temperature on the reference source current can be eliminated. The reference source current becomes controllable through the setting of the constraint circuit, so that the reference current source circuit can output a stable and ideal reference source current, which is not affected by process parameters.

Description

technical field [0001] The invention belongs to the field of integrated circuits, and in particular relates to a reference current source circuit based on a self-bias structure. Background technique [0002] In the application of integrated circuits, the power supply voltage and operating temperature vary greatly due to different use environments. The voltage value usually fluctuates within a certain range, and the temperature often varies from -40°C to 125°C. This requires that the integrated circuit can work normally in the range of different power supply voltages and operating temperature fluctuations. Among them, the reference source current and bias circuit, as the basis of the analog integrated circuit, play a key role in the normal operation of the analog circuit under the influence of power fluctuations and operating temperature. [0003] The role of the reference source current and bias circuit is to provide a stable ideal current source or voltage source for the ...

AI Technical Summary

Problems solved by technology

[0010] It can be seen from formula (4): due to μ, C OX Both are process parameters, so the reference source current I of the existing reference current source circuit ref Although it has nothing to do with the power supply voltage, it is related to process parameters and temperature

While the process parameters and temperature have an effect on the reference source current I ref The influence cannot be quantified and cannot be controlled at present, so the reference current source circuit cannot provide a stable ideal current source for the circuit

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