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Crystal oscillator fast start circuit

A fast startup and crystal oscillator technology, applied in the field of circuits, can solve the problem of slow startup speed of the crystal oscillator drive circuit, and achieve the effect of reducing startup time and improving startup speed.

Inactive Publication Date: 2009-08-26
苏州中科集成电路设计中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of slow start-up speed of the current crystal oscillator drive circuit, and propose a crystal oscillator quick start circuit that can significantly improve the circuit start-up speed

Method used

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Examples

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Embodiment 1

[0023] figure 1 It is a functional block diagram of an embodiment of the crystal oscillator quick start circuit of the present invention. The signal input terminal of the crystal oscillator amplifier circuit is connected to the crystal oscillator signal, the signal input terminal of the crystal oscillator auxiliary amplifier circuit is connected to the signal input end of the crystal oscillator amplifier circuit through a switch circuit, and the signal output end of the crystal oscillator amplifier circuit is connected to the signal output end of the crystal oscillator auxiliary amplifier circuit. The signal output terminal is connected to one signal input terminal of the comparator circuit, the other signal input terminal of the comparator circuit is connected to the standard signal source, the output terminal of the comparator circuit is connected to the clock input terminal of the register circuit, and the data input terminal of the register circuit is connected to the power...

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Abstract

The invention belongs to the field of circuits, relates to an analog integrated circuit, and is a crystal oscillator quick start circuit. The main feature of the circuit is that a crystal oscillator auxiliary amplifier circuit is added on the basis of the existing crystal oscillator starting circuit. When the crystal oscillator starts, the original crystal oscillator amplifier circuit and the auxiliary amplifier circuit work together. Under the simultaneous action of the two circuits, the amplitude of the crystal oscillator can be accelerated and amplified. When the amplitude of the crystal oscillator reaches the predetermined size, the auxiliary amplifier circuit is automatically turned off, leaving only the original crystal oscillator amplifier circuit to continue working. Because the magnification of the original amplifier circuit is low, the amplitude of the crystal oscillator tends to be stable soon, which can greatly reduce the start-up time of the crystal oscillator.

Description

Technical field: [0001] The invention belongs to the field of circuits, and relates to an analog integrated circuit, in particular to a crystal oscillator quick start circuit. Background technique: [0002] The crystal oscillator circuit usually provides the clock of the entire chip, and only after a relatively stable clock is generated, the circuit can be initialized synchronously. Some circuits require a very short time from system power-on to synchronous initialization, which requires the crystal oscillator circuit to start quickly. [0003] At present, the commonly used crystal oscillator circuit is a crystal oscillator plus a drive circuit. The crystal oscillator provides a 180-degree phase difference, and the drive circuit provides a 180-degree phase difference. This circuit has the disadvantage of slow startup speed. This kind of crystal oscillator circuit is not suitable for the circuit that requires a very short time. Invention content: [0004] The object of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B1/00
Inventor 于峰崎
Owner 苏州中科集成电路设计中心有限公司