Voltage output fine tuning circuit

Abstract

The invention provides a voltage output fine tuning circuit. The circuit is characterized in that the circuit includes a MOS pipe Q1, a MOS pipe Q2, a capacitor C and an inverter T1; the MOS pipe Q1 and the capacitor C are connected in series between a power supply VCC terminal and a ground terminal, a grid is connected to an input terminal Vin of the circuit through the inverter T1, and the MOS pipe Q1 is used for realizing on and off according to an inversion signal of the input terminal Vin so as to charge the capacitor C; the MOS pipe Q2 is connected to the capacitor C and an output terminal Vout of the circuit, a grid is connected to the input terminal Vin of the circuit and is used for realizing on and off according to a signal of the input terminal Vin so as to output an electric quantity of the capacitor C. The circuit has advantages that the circuit structure is simple and enforcement cost is low; through different duty ratios of a periodic square wave, a charging amount of the capacitor C is adjusted and fine tuning precision is high; the integral circuit has no resistive component, a resistance of the integral circuit is not influenced; and an engineer does not need to consider a circuit calorific value and energy consumption.

Description

technical field [0001] The invention relates to a voltage output trimming circuit. Background technique [0002] The application of voltage trimming is often involved in chip circuits. The traditional solution is realized through adjustable resistors. Obviously, the accuracy of fine-tuning in traditional solutions is low, which cannot meet the fine voltage adjustment requirements of integrated chip circuits, and the adjustable resistors directly affect chip circuits. The overall impedance of the circuit cannot be used directly in any occasion, and the overall impedance of the circuit needs to be recalculated, which will undoubtedly increase the workload of the engineer. In addition, adjustable resistors have heating problems, and the heat generation and energy consumption of chips need to be considered when setting a large number of resistors. Contents of the invention [0003] In order to overcome the problems mentioned in the background technology, the present invention...

AI Technical Summary

Problems solved by technology

[0002] The application of voltage trimming is often involved in chip circuits. The traditional solution is realized through adjustable resistors. Obviously, the accuracy of fine-tuning in traditional solutions is low, which cannot meet the fine voltage adjustment requirements of integrated chip circuits, and the adjustable resistors directly affect chip circuits. The overall impedance of the circuit cannot be used directly in any occasion. It is necessary to recalculate the overall impedance of the circuit, which will undoubtedly increase the workload of engineers.

In addition, adjustable resistors have heating problems, and the heat generation and energy consumption of chips need to be considered when setting a large number of resistors.

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