LDO circuit based on R2R_VDAC module and electronic equipment

Abstract

The invention relates to an LDO circuit based on an R2R_VDAC module and electronic equipment. According to the LDO circuit based on the R2R_VDAC module and the electronic equipment, the LDO circuit is achieved based on the R2R_VDAC module; for an N-bit adjustable range, the number of used resistors is only 4N-1; compared with 2N resistors needed by a traditional LDO of a resistor string structure, the resistor expenditure is effectively saved, the number of corresponding switches can be greatly reduced, and therefore, the layout wiring difficulty is simplified, the chip area is saved, and the production cost is reduced.

Description

technical field [0001] The present invention relates to the technical field of integrated circuits, and more specifically, relates to an LDO circuit and electronic equipment based on an R2R_VDAC module. Background technique [0002] LDO (Low Dropout Regulator, Low Dropout Linear Regulator) is a linear regulator that uses transistors or field effect transistors operating in its saturation region to subtract excess voltage from the applied input voltage and pass through the system load. The action of the feedback loop produces a regulated output voltage. [0003] refer to figure 1 , figure 1 It is a structural schematic diagram of a basic LDO circuit in the prior art, the output voltage Vout of the LDO=[1+(R1 / R2)*Vref], wherein Vref is a constant reference voltage. [0004] based on figure 1 As shown in the LDO circuit configuration, refer to figure 2 , figure 2 It is a schematic diagram of a 16×16 row-column decoding type DAC structure voltage-dividing resistor string...

AI Technical Summary

Problems solved by technology

[0007] However, the circuit structure of this technology is complex, requiring 256 resistors and 512 switch structures, resulting in difficulty in layout and wiring, increased chip area, and increased production costs.

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