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A voltage controlled oscillator circuit

A voltage-controlled oscillator and voltage-controlled voltage technology, applied in the direction of electric pulse generator circuits, logic circuits to generate pulses, electrical components, etc., can solve the problems of weak noise suppression, limited use range, jitter, etc. High frequency noise interference, the effect of increasing the range of use

Active Publication Date: 2021-07-02
SHANGHAI HUALI MICROELECTRONICS CORP
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  • Abstract
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Problems solved by technology

[0005] In the prior art, this kind of ring oscillator directly controlled by VC, first, any noise interference on VC will be reflected in the frequency, that is, the noise suppression ability is weak; second, the range of use of VC is limited, and PMOS provides The current and VC voltage are nonlinear, so when the PLL frequency changes, it is easy to generate jitter on the output of the PLL

Method used

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  • A voltage controlled oscillator circuit
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Embodiment Construction

[0029] 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.

[0030] figure 2 It is a circuit structure diagram of a voltage-controlled oscillator circuit in the present invention. Such as figure 2 As shown, a voltage-controlled oscillator circuit of the present invention includes: a voltage-to-current module 10 and a voltage-controlled oscillator 20 .

[0031] Wherein, the voltage-to-current module 10 is used to convert the voltage-controlled vol...

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Abstract

The invention discloses a voltage-controlled oscillator circuit, comprising: a voltage-to-current module, used to convert the voltage-controlled voltage VC output by a PLL low-pass filter into a current related to it; a voltage-controlled oscillator, used in the The frequency of the output signal is changed under the control of the current generated by the voltage-to-current module. The present invention can effectively increase the application range of the voltage-controlled voltage VC and suppress high-frequency noise interference on the voltage-controlled voltage VC.

Description

technical field [0001] The present invention relates to a voltage-controlled oscillator circuit, in particular to a novel voltage-controlled oscillator circuit used in a PLL (Phase Locked Loop, phase-locked loop). Background technique [0002] In the phase-locked loop (PLL) design, the voltage-controlled oscillator (Voltage Controlled Oscillator, VCO) is one of the core modules. Take the charge pump type PLL as an example. In operation, the charge pump converts the output of the frequency discrimination phase detector into pulse current, which is converted into a DC voltage VC after a low-pass filter as the voltage control signal of the voltage controlled oscillator. Therefore, for a voltage-controlled oscillator, VC is its input, and its frequency is its output. At the same time, its oscillation frequency directly determines the frequency range in which the PLL can work. [0003] Commonly used voltage-controlled oscillators are mainly ring oscillators composed of multi-sta...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K3/03H03K3/013H03L7/099
CPCH03K3/013H03K3/0315H03L7/0995
Inventor 张宁王志利
Owner SHANGHAI HUALI MICROELECTRONICS CORP
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