Current bias circuit with adjustable and compensable current value

Abstract

The invention relates to the technical field of integrated circuits, in particular to a current bias circuit with an adjustable and compensable current value. The circuit comprises a starting circuit,a positive temperature coefficient current bias circuit, a negative temperature coefficient current bias circuit and a positive and negative temperature coefficient current bias selection compensation circuit. The starting circuit is used for triggering and starting the positive temperature coefficient current biasing circuit; the positive temperature coefficient current bias circuit and the negative temperature coefficient current bias circuit output a current to the positive and negative temperature coefficient current bias selection compensation circuit, and the positive and negative temperature coefficient current bias selection compensation circuit performs selection compensation according to the received current value. According to the present invention, the problem that positive and negative temperature coefficients cannot be truly compensated in the prior art is solved. The circuit comprises the positive temperature coefficient current bias circuit and the negative temperaturecoefficient current bias circuit at the same time, so that the problems that in the prior art, only the positive temperature coefficient current bias circuit or the negative temperature coefficient current bias circuit is included, and the circuit is more single, are solved.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a current bias circuit with adjustable and compensable current value. Background technique [0002] In integrated circuit design, if the amplifier composed of semiconductor devices such as transistors and MOS tubes can amplify the signal voltage without distortion, it must ensure that these devices are in a specific working state, that is, their operating points should be set, and these The setting of the operating point can be realized through an external circuit, and this external circuit is called a bias circuit. Of course, in addition to amplifiers, many circuit structures in integrated circuits must be provided with operating points or stable initial states by bias circuits. These circuit structures are usually called follow-up circuits driven by bias circuits. Therefore, bias circuits in integrated circuits It is very important and widely used. According to th...

AI Technical Summary

Problems solved by technology

At present, the so-called zero temperature coefficient current bias circuit uses two different types of resistors, such as well resistors and high-resistance polycrystalline resistors, to compensate by using their opposite temperature coefficient characteristics, and the temperature of these two types of resistors The characteristics are not exactly the same, that is, as the temperature changes, the resistance change characteristics of the two types of resistors are different, so temperature compensation cannot be truly achieved

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