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Filter circuit for relaxation oscillator capable of effectively preventing comparator misjudgment

A relaxation oscillator and filter circuit technology, applied in the field of integrated circuit design, can solve the problems of oscillator output frequency deviation, wrong judgment, etc., and achieve the effects of excellent performance, easy integration, and simple structure

Pending Publication Date: 2018-07-06
CHANGSHA JINGJIA MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The problem to be solved by the present invention is: Aiming at the problem that the comparator in the conventional relaxation oscillator circuit is susceptible to external surge interference during the working process and produces wrong judgments, which leads to deviations in the output frequency of the oscillator, a The filtering circuit that can effectively prevent the misjudgment of the comparator for the relaxation oscillator, the main features of the present invention are:

Method used

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  • Filter circuit for relaxation oscillator capable of effectively preventing comparator misjudgment
  • Filter circuit for relaxation oscillator capable of effectively preventing comparator misjudgment
  • Filter circuit for relaxation oscillator capable of effectively preventing comparator misjudgment

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Embodiment Construction

[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0015] The present invention proposes a filter circuit for a relaxation oscillator that can effectively prevent misjudgment by a comparator. Its structure is as follows: image 3 As shown, it is characterized in that it includes four inverters, two delay circuits, two two-input NAND gates, two two-input AND gates and a D flip-flop; among them, the four inverters are INV1 , INV2, INV3 and INV4, the two delay circuits are respectively DL1 and DL2; the two two-input NAND gates are respectively NA1 and NA2, the two two-input AND gates are respectively AND1 and AND2, and one D flip-flop is D0; One input terminal of the two-input AND gate AND2 is connected to the input port IN, the output terminal of the two-input AND gate AND2 is connected to the clock input terminal CK of the D flip-flop D0, and the reset terminal RN of the D flip-flop D0 is connected to the rese...

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Abstract

The invention discloses a filter circuit for a relaxation oscillator capable of effectively preventing comparator misjudgment. Compared with a comparator in a conventional relaxation structure oscillator, the filter circuit for the relaxation oscillator capable of effectively preventing comparator misjudgment provided by the invention performs filtering processing on the working process of the comparator, and can effectively filter out the misjudgment to the comparator due to the surge influence, so that the oscillator works more stably and reliably.

Description

technical field [0001] The invention is used in the field of integrated circuit design, and in particular relates to a filter circuit for a relaxation oscillator that can effectively prevent misjudgment by a comparator. Background technique [0002] When it comes to clock sources in portable electronic products, the crystal oscillator circuit is the first thing that comes to mind. Indeed, crystal oscillator circuits have achieved great success in the development and application of consumer chips with their good frequency accuracy and stability. However, there are still two fatal disadvantages in the crystal oscillator circuit: First, the start-up time is longer. Although various technical means have been adopted at home and abroad to reduce the start-up time of crystal oscillators in recent years, due to the inherent characteristics of crystals, the start-up time of hundreds of microseconds or even milliseconds is still unacceptable under many application conditions. ; Sec...

Claims

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Application Information

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IPC IPC(8): H03H11/38H03K3/013
CPCH03H11/38H03K3/013
Inventor 王志鹏
Owner CHANGSHA JINGJIA MICROELECTRONICS
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