Implementation system of low-voltage reference source

Abstract

The invention relates to an implementation system of a low-voltage reference source. The implementation system solves the existing problem of stripe interference mixed in an image output by an image sensor caused by the facts that low-voltage reference sources of lower than 1.2V are small in variety and high in internal resistance, superimposed interference for burrs is easy on reference voltage when the capacitive load of a switch is connected. The implementation system comprises a reference source, a resistance voltage division circuit, a first RC passive low-pass filtering circuit, a power supply, a second RC passive low-pass filtering circuit, an active low-pass filtering circuit consisting of an operational amplifier, serially connected resistors, a high-capacity ceramic capacitor and an image sensor. The implementation system uses a topological structure that the operational amplifier follows after voltage division of an existing high-voltage reference source, the load capacitors of the switch inside the high-capacity ceramic capacitor and the image sensor are used to be connected in parallel to reduce the fluctuation of reference voltage, and external disturbance is reduced by using the low-pass filtering circuit.

Description

technical field [0001] The invention relates to a realization system of a low-voltage reference source, in particular to a realization system of a low-voltage reference source applied to a capacitive switching load of an image sensor. Background technique [0002] In today's image sensor applications, a variety of reference voltage sources are required, especially low voltage reference sources with voltages below 1.2V. Using a low-voltage reference source built inside the image sensor can not only improve reliability, but also reduce volume and weight. However, when the load is a switching capacitor, interference glitches will appear on the reference voltage, and the output image will be mixed with fringe interference. There are few types of low-voltage reference voltage sources with a voltage lower than 1.2V on the market, and most of them have high internal resistance, which cannot meet the application requirements of switched capacitor loads. [0003] Therefore, the pres...

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Problems solved by technology

[0004] The present invention solves the problem that the existing low-voltage reference voltage source lower than 1.2V has few types and high internal resistance, and when connecting a switch capacitive load, interference glitches are easily superimposed on the reference voltage, resulting in mixed stripe interference in the image output by the image sensor. , providing a realization system of low-voltage reference source

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