Inbuilt miicromicro farad stage capacitance intermittent microcurrent second-level time delay circuit

Abstract

The invention discloses an inbuilt miicromicro farad stage capacitance intermittent microcurrent second-level time delay circuit, which is provided with a mirror image current source, a switching tube, a capacitance charging circuit, a burst pulse generating circuit and an output circuit, wherein the output end of the mirror image current source and the output end of the burst pulse generating circuit are respectively connected with two input ends of the switching tube; the output end of the switching tube is connected with the input end of the capacitance charging circuit; the output end of the capacitance charging circuit is connected with the input end of the output circuit; and the output end of the output circuit is connected with a subsequent signal processing circuit. When a mirror image source produces microcurrent to charge the capacitance by the switching tube, a burst pulse signal controls the switching on and off of the switching tube to realize the intermittent charging to the capacitance by the microcurrent so as to prolong charging time and reduce inbuilt capacitance value in an integrated circuit; when the capacitance charging circuit outputs the voltage value which reaches the preset value, the output circuit converts an analog signal into a digital signal to be provided for the subsequent signal processing circuit.

Description

technical field [0001] The invention relates to a time delay circuit inside an integrated circuit, in particular to an intermittent micro-current second-level time delay circuit with a built-in picofarad capacitor, which belongs to the technical field of microelectronics. Background technique [0002] In circuit design, a delay circuit is usually required to allow the signal to change from one state to another state (on or off) after a certain period. The traditional time delay circuit is usually implemented by a digital clock circuit and a frequency divider; or an external capacitor is charged and discharged to provide a time delay. The capacitor is in microfarads, and the resistance needs to be more than 500 kΩ to obtain a second-level time delay. These two methods occupy a large area of ​​the integrated circuit chip, so it is difficult to build them. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art...

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Problems solved by technology

These two methods occupy a large area of ​​the integrated circuit chip, so it is difficult to build

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