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Resistance-capacitance (RC) oscillator and realization method thereof

A technology of oscillator and comparator, which is applied in the direction of pulse generation, electrical components, electric pulse generation, etc., can solve the problem that it is difficult to obtain accurate oscillation frequency, etc.

Active Publication Date: 2011-05-04
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the problem that it is difficult to obtain accurate oscillation frequency in the above-mentioned prior art, the main purpose of the present invention is to provide an RC oscillator and its implementation method, so that its output frequency does not vary with temperature and power supply voltage, and can generate a more accurate oscillation frequency

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  • Resistance-capacitance (RC) oscillator and realization method thereof
  • Resistance-capacitance (RC) oscillator and realization method thereof
  • Resistance-capacitance (RC) oscillator and realization method thereof

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Embodiment Construction

[0028] The implementation of the present invention is described below through specific examples and in conjunction with the accompanying drawings, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific examples, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0029] figure 1 It is a structural schematic diagram of an RC oscillator in the present invention. like figure 1 As shown, an RC oscillator of the present invention includes: a mirror constant current source generation circuit 101 , a reference voltage generation circuit 102 , a comparison shaping circuit 103 and a charging and discharging circuit 104 .

[0030] figure 2 It is a schemat...

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Abstract

The invention provides a resistance-capacitance (RC) oscillator and a realization method thereof. According to the invention, a reference voltage generating circuit is used for obtaining charge upper limit voltage and a discharge lower limit voltage, and a comparison shaping circuit is used for comparing the charge upper limit voltage and discharge lower limit voltage with the charge and discharge voltages to generate a charge control signal and a discharge control signal to control a charge and discharge capacitor in a charge and discharge circuit to carry out charge and discharge so as to obtain the RC oscillator with more accurate oscillation frequency. The oscillation frequency of the RC oscillator does not depend on the reference offset current but depends on the resistance and the capacitance of the charge and discharge capacitor, therefore, the RC oscillator which does not depend on temperature and power supply voltage can be obtained by using the resistor and the capacitor with low temperature coefficients and low voltage drifts.

Description

technical field [0001] The invention relates to an oscillator and a realization method thereof, in particular to an RC oscillator independent of temperature and power supply voltage and a realization method thereof. Background technique [0002] The RC oscillator is a resistance-capacitance oscillator (R: resistance; C: capacitance). More and more chip designs need to use RC oscillators. With the advancement of technology, the requirements for RC oscillators are getting higher and higher. While reducing costs, the requirements for adaptability to voltage and temperature are getting higher and higher. . [0003] figure 1 is a schematic diagram of a conventional RC oscillator, such as figure 1 As shown, a conventional RC oscillator includes inverters ( 102 , 104 and 108 ), capacitor C1 , resistor R1 and an inverting unit 106 . Wherein the input terminal of the inverter 102 is coupled to the node N 11 , the output terminal of which is coupled to the input terminal of the i...

Claims

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Application Information

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IPC IPC(8): H03K3/011
Inventor 张志军
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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