Circuit which is applied to relaxation oscillator and is capable of realizing precise frequency modulation

A relaxation oscillator, precise technology, applied in the direction of modulation, electrical components, angle modulation, etc., can solve the problem of precise adjustment of difficult frequency, and achieve the effect of excellent performance and simple structure

Active Publication Date: 2018-04-10
CHANGSHA JINGJIA MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The most direct way is to further reduce the step size of the variable resistor, for example, divide the 1Kohm resistor into thirds, and each resistor is 333ohm. This method is not impossible, but it is too ideal, because the adjustment of the variable resistor Switching is required, and the on-resistance of the MOS tube when switching is a factor that cannot be ignored. Therefore, it is difficult to achieve precise frequency adjustment in such a frequency modulation method.

Method used

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  • Circuit which is applied to relaxation oscillator and is capable of realizing precise frequency modulation
  • Circuit which is applied to relaxation oscillator and is capable of realizing precise frequency modulation
  • Circuit which is applied to relaxation oscillator and is capable of realizing precise frequency modulation

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] A circuit that can realize precise frequency modulation for a relaxation oscillator proposed by the present invention, its structure is as follows figure 2 Shown, it is characterized in that: comprise error amplifier, current source, programmable resistance network, fixed resistance, programmable feedback network and temperature compensation circuit; Wherein, described error amplifier, current source are all connected DC voltage VDD, the error amplifier The positive terminal is connected to the reference voltage VREF, the negative terminal of the error amplifier is connected to the output terminal of the programmable feedback network, the output terminal of the error amplifier is connected to the input terminal of the current source to adjust the current of the current source, and the output terminal of the current source is connected to the programmab...

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Abstract

The invention discloses a circuit which is applied to a relaxation oscillator and is capable of realizing precise frequency modulation. Compared with a traditional frequency modulation of the relaxation oscillator, the circuit has the advantages that through utilization of errors imported by multiway feedback voltages, the problem that a structure of the relaxation oscillator is difficult to realize precise frequency modulation is skillfully solved, and a relaxation structured oscillator, instead of a crystal oscillator, can even be applied to some circuits having relatively harsh frequency precision demands.

Description

technical field [0001] The invention is used in the field of integrated circuit design, and in particular relates to a circuit for a relaxation oscillator that can realize precise frequency modulation. 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. ; Second, the use of cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03C3/09
CPCH03C3/0958
Inventor 王志鹏
Owner CHANGSHA JINGJIA MICROELECTRONICS
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