An adjustable constant current source integrated chip and its manufacturing method

Abstract

The invention relates to an adjustable constant current source integrated chip and a manufacturing method. The adjustable constant current source integrated chip comprises a monocrystalline silicon N-type polished wafer which serves as an N-doped region, an N+ heavily doped region is arranged on the back of the N-doped region, a triode Q2, a current regulative diode (CRD), a triode Q1 and a resistor R are arranged on the front of the N-doped region, one end of an N+ doped region of the resistor R is connected with an N+ doped region of the triode Q2, meanwhile, the N+ doped region of the resistor R serves as the cathode of the constant current source integrated chip, the other end of the N+ doped region of the resistor R is respectively connected with an N+ doped region of the triode Q1 and a P doped region of the triode Q2, a P doped region of the triode Q1 is respectively connected with a P doped region of the CRD, the P doped region of the triode Q2 and an N doped region of the triode Q2, an N doped region of the CRD is respectively connected with the P doped region and a second N+ doped region of the CRD, and the N+ heavily doped region serves as the anode of the constant current source integrated chip.

Description

technical field [0001] The invention relates to an integrated chip, in particular to an adjustable constant current source integrated chip and a manufacturing method thereof. It belongs to the technical field of integrated chips. Background technique [0002] The constant current source is a power supply that can provide a constant current to the load. It is widely used in electronic circuits, especially the rise of LED lighting in recent years. Its constant current drive scheme has promoted the development of low-cost, high-reliability constant current source devices. . At present, according to the main components of the constant current source circuit, it can be divided into three categories: transistor constant current source (see Figure 14 ), JFET constant current source (see Figure 15 ), integrated operational amplifier constant current source. The three schemes have different advantages and disadvantages. The constant current source of the transistor is adjustable...

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Problems solved by technology

The three schemes have different advantages and disadvantages. The constant current source of the transistor is adjustable, but the dynamic resistance is relatively small, and the constant current performance is poor; the constant current performance of the field effect constant current tube is better, but the chip area utilization rate is low. (the ratio of constant current current to chip area), the constant current cannot be adjusted, and the chip yield rate is low (higher requirements are placed on the manufacturing process level); although the performance of the integrated op amp constant current source is good, the manufacturing process is complicated and the cost High, and the transistor constant current source and the integrated operational amplifier constant current source are usually circuits composed of independent components, and the reliability is relatively low

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