an rc oscillating circuit

Abstract

The present invention provides an RC oscillating circuit, comprising: a first group of inverters, a second group of inverters, a latch, a delay circuit, and a third group of inverters; the first group of inverters is connected to A delay circuit, which is used to generate two first signals A and a second signal B with opposite potentials; the input terminal of the second group of inverters is connected to the enable signal EN, and the output terminal thereof is connected to the latch; the delay circuit The output end of the latch is connected to the latch for delaying the first signal A and the second signal B; the latch is connected to a third group of inverters, which includes a first output end and a second output end, It receives the first delay signal DA and the second delay signal DB, and receives the first clock signal FB and the second clock signal FA generated by itself; after the first clock signal FB is driven by the third group of inverters The output signal CLK is output from its output terminal. The invention can avoid the unrecoverable situation after the circuit enters the dead state, and the circuit cost is low.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an RC oscillator circuit. Background technique [0002] At present, the basic principle of the RC oscillator is to periodically charge and discharge the capacitor through the resistance. When the voltage on the capacitor reaches a certain level, the charging switch is controlled to be turned off through feedback, and the discharging switch is turned on. If only one capacitor is charged and discharged, it is generally controlled by a hysteresis comparator. If two sets of capacitors are charged and discharged, two comparators are used for feedback control. However, a comparator is basically required to judge the level and control the charging and discharging switch. [0003] Moreover, this way of using the comparator to judge the level must have the problem of output dead state. For example, the output node of the comparator reaches the middle level due to external force, an...

AI Technical Summary

Problems solved by technology

Increase circuit area and power consumption cost, and increase design difficulty

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