Detecting regulation circuit

Abstract

Being setup on main resistance of voltage reference circuit, multiple adjustment resistances are connected to the main resistance in series. Each resistance is connected to transistor switch in parallel, and each transistor switch is connected to logic controller. Sensing circuits and fuses in quantity equal to number of transistor switch are connected to the logic controller in sequence. Receiving a reset signal from low to high of power supply, sensing circuit senses whether fuse is burned out, and then the circuit sends voltage level to logic controller, where voltage level '0'represents not burned out, and '1'represents burned out. Based on logic conversion table, the logic controller converts received voltage level to control corresponding transistor switch in order to determine whether each transistor switch is in on state or not so as to reach purpose of fine-tuning value of main resistance in voltage reference circuit.

Description

technical field [0001] The invention relates to a detection and adjustment circuit, in particular to a detection and adjustment circuit that uses a transistor switch to adjust a reference voltage generation circuit. Background technique [0002] At present, the semiconductor industry is moving towards a design-oriented trend, and under the leadership of this trend, the development of 3C integration and system-on-a-chip (SOC) is the hottest, because when the focus is on low price, high performance, and power saving , light, thin, and portable can only be achieved with more precise design technology and better manufacturing processes. Today, the number of transistors that can be accommodated in a unit chip is increasing. And the integration of various components has gradually achieved remarkable results under the efforts of developers. [0003] However, on various chip circuits, a reference voltage generating circuit is required to generate a reference voltage, so we take thi...

AI Technical Summary

Problems solved by technology

[0005] 1. The reference voltage generating circuit A used in the prior art can only choose to blow the fuse B2 after the chip is made, but cannot grow the fuse B2. Therefore, in order to achieve positive and negative two-way fine-tuning, before the chip is processed, All fuses B2 are not blown (short circuit), so the output voltage A2 of its reference voltage generating circuit A must be low (such as figure 2 shown)

[0006] 2. The fuse B2 in the prior art uses current to blow out, and when the current is improperly controlled, it will damage the reference voltage generating circuit A and make the reference voltage generating circuit A useless

Images